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#672276 — 22.11.2012 в 19:58 Литературный обзор.  
Здесь интересное, на мой взгляд, за последние пару месяцев. Комментариев и перевода не будет( если кому интересно - есть гугл для подстрочного перевода и кредитные карты для получения полного текста).


Clin Oral Implants Res. 2012 Oct 17. doi: 10.1111/clr.12045. [Epub ahead of print] Long-term changes in graft height after maxillary sinus augmentation, onlay bone grafting, and combination of both techniques: a long-term retrospective cohort study. Schmitt C, Karasholi T, Lutz R, Wiltfang J, Neukam FW, Schlegel KA. http://www.ncbi.nlm.nih.gov/pubmed/23075057 Key words: Bone augmentation, Onlay bone grafting This retrospective cohort study with prospective long-term follow-up of 25 patients with edentulous severe atrophic maxillae investigated vertical augmentation procedures with autologous bone prior to implant placement. Patients underwent either sinus elevation, onlay grafting or a combination of both. A total of 127 implants were inserted in the 25 patients after a 4-months healing period (Implants from 3 manufacturers were used, including Straumann, Nobel Biocare and Astra Tech. Implant types were not specified). Prosthetic rehabilitation was provided 6 months after implant placement. A cumulative implant survival rate of 94.5% was achieved (no differential analysis between the implant systems). Bone loss was significant during the first 12 months for all groups (using a standard panoramic radiograph technique by Sirona Dental Systems). After 10 years, the vertical bone loss was 27.5% after onlay grafting, 28.1% after sinus elevation and 30.2% in the combination group, with no significant differences between the groups. Take-home message: The method of bone augmentation with autologous bone grafts seems to have no influence on the vertical bone loss.

Clin Implant Dent Relat Res. 2012 Oct 15. doi: 10.1111/cid.12008. [Epub ahead of print] A 10-year clinical and radiographic study of implants placed after maxillary sinus floor augmentation with an 80:20 mixture of deproteinized bovine bone and autogenous bone. Mordenfeld A, Albrektsson T, Hallman M Key words: Clinical study, dental implants, deproteinized bovine bone, sinus floor augmentation Of 20 patients who received dental implants with turned surfaces after maxillary sinus floor augmentation with deproteinized bovine bone and autogenous bone (80:20), 14 were available for a 10-year follow-up evaluation; 53 and 15 implants were placed in grafted and non-grafted sites, respectively. Mean marginal bone loss after 10 years was 1.6 ± 1.0 mm and of the original 108 implants placed, 15 were lost giving a cumulative survival rate of 86%. There were no significant differences between grafted and non-grafted bone, or between smokers and non-smokers, for marginal bone level, pocket depth or implant stability quotient. Graft height was significantly reduced between 3 months and 2 years, but there was no further significant reduction up to 10 years. Take-home message: Good clinical and radiological results can be achieved after 10 years with turned surface implants in augmented bone, and the most critical time appears to be the first 2 years after placement.

J Periodontol. 2012 Oct;83(10):1226-34. Epub 2012 Jan 5. A 10-year evaluation of implants placed in fresh extraction sockets: a prospective cohort study. Covani U, Chiappe G, Bosco M, Orlando B, Quaranta A, Barone A. http://www.ncbi.nlm.nih.gov/pubmed/22220768 Key words: Sweden & Martina Premium, OsteoBiol Gen-Os, OsteoBiol Evolution, Guided bone regeneration, Extraction sockets This prospective trial evaluated the clinical and radiological observations from the 10-year follow-up of implants immediately placed into extraction sockets with or without guided bone regeneration (GBR). From the totally 159 implants placed in 91 patients, 101 required GBR simultaneously at implant placement. All implants were used to support single crown restorations. The cumulative survival rate was 91.8% with no differences between the two groups. The success rates were 87.9% in the non-GBR group and 94.1% in the GBR group (success was evaluated according to Buser et al. 1990), however the authors did not describe this difference as statistically significant. 98% of all implants showed a marginal bone loss of 0.1 to 1.5mm at the 10-year visit and 2% showed bone loss of 1.6-2.0mm; no differences were reported between the two groups. Take-home message: There may be no difference in terms of implant survival, success and bone remodeling when implants are placed in fresh extraction sockets with or without GBR.


Clin Oral Implants Res. 2012 Oct 2. doi: 10.1111/clr.12034. [Epub ahead of print] Longevity of implant crowns and 2-unit cantilevered resin-bonded bridges. Lam WY, Botelho MG, McGrath CP. http://www.ncbi.nlm.nih.gov/pubmed/23025467 Key words: Biological complications, bounded edentulous space, complication rates, debonding, dental implants, failures, fixed dental prostheses, peri-implantitis, resin-bonded bridges, single crowns, success, survival, technical complications Patients with implant-supported crowns or cantilevered resin-bonded bridges were evaluated to determine the prosthetic survival (retention in mouth) and success (absence of complications requiring intervention). A total of 78 patients, with a mean observation time of 100 months, were evaluated. Overall, prosthesis, and supporting structures survival rates were similar, but there was a significant difference between the crown and bridge groups with regard to the success of the supporting structures. Successful supporting structures were significantly more prevalent with cantilevered resin-bonded bridges, and biological complications were significantly more common with implant-supported crowns. Take-home message: Survival was similar between implant-supported crowns and cantilevered resin-bonded bridges, but success rates were higher in the latter group.
J Prosthet Dent. 2012 Oct;108(4):259-67. doi: 10.1016/S0022-3913(12)60174-7. Esthetic considerations related to bone and soft tissue maintenance and development around dental implants: Report of the Committee on Research in Fixed Prosthodontics of the American Academy of Fixed Prosthodontics. Rodriguez AM, Rosenstiel SF. http://www.ncbi.nlm.nih.gov/pubmed/23031733 Key words: Dental implants, esthetics, abutment connections Increasing esthetic demands have led to newer techniques in achieving a predictable esthetic result. Careful implant placement and the use of smaller diameter implants may be useful, and avoiding adjacent implants while maintaining a safe tooth-implant distance are also beneficial. Platform switching may also have advantages. Esthetic benefits may also be obtained by provisional restoration, especially early. Take-home message: Trends in achieving and maintaining predictable esthetics regarding bone and soft tissue around implants are reviewed and described.
J Oral Implantol. 2012;38(S1):491-496. doi: Effects of different abutment connection designs on the stress distribution around five different implants: a 3-dimensional finite element analysis. Balik A, Karatas MO, Keskin H. Key words: Implant, abutment connection, finite element, strain distribution, prosthetics A finite element model was used to evaluate strain distribution with implants from five different implant-abutment connection systems from five different manufacturers. The highest strain was observed with an external hexagonal connection, while the lowest strain was found with an internal hexagonal connection system. Take-home message: The most successful systems, according to the results of this investigation, seemed to be those with conical internal hexagonal and screw-in abutment connections.
Clin Oral Investig. 2012 Oct 21. [Epub ahead of print] Accuracy of digital and conventional impression techniques and workflow. Seelbach P, Brueckel C, Wöstmann B. http://www.ncbi.nlm.nih.gov/pubmed/23086333 Key words: Straumann iTero, Sirona CEREC, 3M ESPE Lava C.O.S., Intraoral scanning, Digital impression This study compared the accuracy of full-ceramic crowns obtained from intraoral scans with Lava C.O.S, CEREC and iTero. From the master model of a molar tooth, 10 conventional impressions were taken using silicone and poured with type IV plaster. Subsequently, 10 crowns were made of two materials (Lava zirconia and Cera E cast crowns). In parallel 10 digital impressions were taken with the Lava C.O.S. system and Lava zirconia crowns manufactured, and 10 full ceramic crowns were fabricated with CEREC (Empress CAD) and 10 full ceramic crowns were made with iTero (Copran Zr-i). Measurement of the accessible marginal inaccuracy resulted in comparable values in the range of 30-70 μm for all techniques/systems. Measurement of the internal fit also resulted in errors in the range of 35-90 μm for all techniques/systems. Take-home message: This in-vitro study suggests that digital impression systems allow the fabrication of fixed prosthetic restorations with similar accuracy as conventional impression methods. The standard deviations of the measurements do not allow detection of differences between the digital impression systems.

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pyramid Оффлайн
22.11.2012 в 19:58 Написал pyramid Врач Оффлайн 0+
#672277 — 02.12.2012 в 16:29 Re: Литературный обзор. [Re: pyramid]  
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michail Оффлайн
02.12.2012 в 16:29 Написал michail Врач Оффлайн 0+
#672278 — 03.03.2013 в 08:11 Re: Литературный обзор 01.03.13. [Re: pyramid]  
Несколько интересных абстрактов.
1. Этот чемпион, ИМХО, т.к. примиряет непримиримых в этой ветке

J Oral Implantol. 2012 Dec;38(6):729-37. doi: 10.1563/AAID-JOI-D-11-00168.
Clinical evaluation of short and wide-diameter implants immediately placed into extraction sockets of posterior areas: a 2-year retrospective study.
Jiansheng H, Dongying X, Xianfeng W, Baoyi X, Qiong L, Jincai Z.
Key words: Immediate implants, follow-up study, posterior area, short and wide diameter implant, extraction socket, single tooth, Dentsply Ankylos, Bicon
Between 2006 and 2009, 162 short and wide-diameter implants were immediately placed in extraction sockets in 145 patients and restored with single crowns. The implants were length 8 mm with diameter 5.5 or 7 mm (Dentsply Ankylos) or length 5.7-8 mm with diameter 5 or 6 mm (Bicon). The mean follow-up time was 24 months and the implant survival rate was 99.4% (one implant failed before prosthetic restoration). Hard and soft tissues were well maintained.

Take-home message: Immediately placed short and wide implants may be a safe and predictable alternative treatment option with sufficient ridge height and width and with appropriate implant positioning.

2. Интересный абстракт, но в нем, к сожалению, не указано каким образом поднимался синус ( закрытым или открытым методом). Но смысл понятен - поднимали без всяких добавок графтов и проч., сразу же нагружали и получали через два года отличную стабильность и наращивание кости под синусом 5.7 ± 3.4 mm .
Clin Implant Dent Relat Res. 2013 Jan 11. doi: 10.1111/cid.12035. [Epub ahead of print]
Immediate loading of implants placed simultaneously with sinus membrane elevation in the posterior atrophic maxilla: a two-year follow-up study on 10 patients.
Cricchio G, Imburgia M, Sennerby L, Lundgren S.
Key words: Bone augmentation, dental implants, GBR, maxillary sinus, Nobel Biocare Brånemark Mk II TiUnite
Maxillary sinus floor elevation was performed in 10 patients and a total of 21 TiUnite implants were placed under the elevated sinus membrane into the sinus. The implants were immediately loaded and radiographs were taken at placement and after 6 months and 1 and 2 years. Implant stability was measured at placement and after 6 months. All implants were clinically stable during the 2-year follow-up. Mean new intrasinus bone formation of 5.7 ± 3.4 mm was observed after 6 months.
Take-home message: Elevation of the maxillary membrane with simultaneous placement and loading of implants without grafting material appeared to show predictable results after 2 years. All patients showed intrasinus bone formation, but the influence of immediate loading on bone formation requires further analysis.

3. То, что , вообщем, и так хорошо известно, но тут научно-экспериментально. Церкон и Emax в полную анатомию в боковых отделах на имплантах - хорошо, церкон с нанесением - не очень. Хотя, как по мне, то Емах в полную анатомию - много слабее церкона в полную.

Implant Dent. 2013 Feb;22(1):66-70.
Fracture load of monolithic CAD/CAM lithium disilicate ceramic crowns and veneered zirconia crowns as a posterior implant restoration.
Kim JH, Lee SJ, Park JS, Ryu JJ.
Key words: ceramic, zirconia, monolithic lithium disilicate, restoration
A laboratory test to compare the fracture load and failure mode of the monolithic lithium disilicate crown (e.max group) and 2 types of veneered zirconia crowns, hand layer (ZV group) and heat pressed (ZP group), as a posterior implant-supported restoration. A total of 24 all-ceramic crowns for molar tooth were fabricated using the computer-aided design/computer-assisted manufacture (CAD/CAM) system. All crowns were luted to the abutments, which were connected to implant fixtures, using resin cement. Fracture load was measured using the universal testing machine, and the fracture surface was evaluated by scanning electron microscopy. The ZP group showed significantly higher fracture load (5229.3 N) compared with the e.max group (3852.1 N) and ZV group (3100.3 N). All fractures in the ZV group occurred in the veneered layer.
Take-home message: Monolithic CAD/CAM lithium disilicate crowns are applicable to posterior implant-supported restorations because the fracture load was higher than the average occlusal force.

4. Ну , наконец, мои любимые телескопы. Часто спрашивают, а можно телескопы на импланты или еще а можно в одном роте телескопы и на имплантах и на зубах - не только мона, но и нуна.

J Prosthodont. 2013;22(1):2-12.
A systematic review of the clinical performance of tooth-retained and implant-retained double crown prostheses with a follow-up of ≥3 years.
Verma R, Joda T, Brägger U, Wittneben JG.
Key words: Double crowns, telescopic crowns, abutment teeth, implants, telescopic prosthesis, biologic complications, technical complications, failures
An electronic literature search was performed for studies on the outcomes of double crown prostheses; 65 were selected for review from a total of 2,412; of these, 17 were included. Survival ranged from 82.5% to 96.5% for telescopic abutment teeth and from 66.7% to 98.6% for tooth-supported double-crown-retained dentures, while implant survival rates ranged from 97.9% to 100%. The main biological complications for tooth abutments were gingival inflammation, caries and periodontal disease, while loss of cementation or facings were the main technical complications.
Take-home message: Survival rates varied for double tooth crown abutments and dentures, but good long-term prognosis was seen for implant-supported mandibular overdentures; however,both tooth- and implant-supported reconstructions need more prosthetic maintenance (e.g. relining and repair).
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pyramid Оффлайн
03.03.2013 в 08:11 Написал pyramid Врач Оффлайн 0+
#672279 — 03.03.2013 в 10:55 Re: Литературный обзор 01.03.13. [Re: pyramid]  
Рауф ! Вот ты молодец! Очень интересно, спасибо!

Все хорошо в меру, даже скромность.
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Dan Оффлайн
03.03.2013 в 10:55 Написал Dan Врач Оффлайн 0+
#672280 — 28.03.2013 в 05:28 Re: Литературный обзор 01.03.13. [Re: pyramid]  
ИМХО,во втором случае про закрытый синус речь.
Открытый без графта вообще смысл теряет.ИМХО ещё раз.

То,что нас не убивает,можно попробовать еще раз.
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annda Оффлайн
28.03.2013 в 05:28 Написал annda Врач Оффлайн 0+
#672281 — 08.06.2013 в 09:25 Re: Литературный обзор 01.06.13. [Re: pyramid]  
Вот такое исследование по поводу коротких имплантатов 8,5 и меньше с соотношением коронка-имплантат 2 и больше, в среднем 1,82. Через 20 мес. все выжило. Но... потеря кости около 0,5 мм наблюдалась( что, в общем не странно - учитывая тип имплантата - BTI - цилиндр в цилиндре с лепестками - типа Нобеля -чебурашки или Камлога). Выводы - соотношение коронка-имплантат не имеют значения, а вот консоль значительно ухудшает прогноз. А имплантат вот такой

Clin Implant Dent Relat Res. 2013 May 8. doi: 10.1111/cid.12073. [Epub ahead of print]
Retrospective study of short and extra-short implants placed in posterior regions: influence of
crown-to-implant ratio on marginal bone loss.
Anitua E, Piñas L, Orive G.
Key words: Extra-short implants, implant survival, marginal bone loss, retrospective, short implants, BTI
implants (Biotechnology Institute, Spain)
Patients rehabilitated with implants ≤ 8.5 mm in length to support prostheses in the posterior region were
retrospectively evaluated. Prosthetic and biomechanical variables, and patient-, surgery- and implant-related
factors were assessed. A total of 63 patients received 128 implants, with a mean follow-up time of 21.88
months. The crown:implant (C:I) ratio was either < 2 (86 implants) or &#8805; 2 (42 implants); the mean C:I ratio
was 1.82. All implants and prostheses survived, and the mean bone loss was 0.35 ± 0.50 mm after 1 year
and 0.45 ± 0.46 mm for subsequent evaluations, but the presence of a cantilever had a significant negative
influence on bone loss.
Take-home message: C:I ratio did not have a significant influence on marginal bone loss, but the use of a
cantilever had a significant negative influence.

Интересное исследование, которое подвергает сомнению многие постулаты опинион-лидеров Анкилоза, да и вообще всех любителей конусов и переключений платформ. Все виды установки субкрестально, крестально или супракрестально - дают одинаковые результаты в стабильности кости и потери костной ткани. Хмммм.... интересно.

Romanos GE, Aydin E, Gaertner K, Nentwig GH.
Key words: Crestal, implant position, subcrestal, Dentsply Ankylos implants
In 85 patients, a total of 228 implants were placed either crestally (within 0.5 mm of the bone crest; 65
implants), subcrestally ( &#8805; 0.5 mm or more below the bone crest; 197 implants) or supracrestally (> 0.5 mm
above crestal bone level). Periotest values and mesial and distal bone loss was recorded. Mean mesial and
distal bone loss was 1.84 ± 1.49 mm and 1.73 ± 1.31 mm for subcrestal implants, and 1.41 ± 1.65 mm and
1.34 ± 160 mm for crestal implants. Bone level and Periotest values were not significantly different between
the groups.
Take-home message: Implant stability and bone loss was similar between the groups, indicating that
subcrestal or crestal implant placement with delayed loading were equally suitable.

Статья о моих любимых телескопах. Верхняя челюсть и телескопы - выживаемость и имплантов и протезов 100% за 5,5 лет. Телескопы рулят!

Clin Implant Dent Relat Res. 2013 May 16. doi: 10.1111/cid.12087. [Epub ahead of print]
Double Crown-Retained Maxillary Overdentures: 5-Year Follow-Up.
Frisch E, Ziebolz D, Ratka-Kr&#252;ger P, Rinke S.
Key words: Dental implant, double crown, maxilla, overdenture, peri-implantitis, technical complication,
Dentsply Ankylos implants
Patients restored with edentulous maxillae restored with overdentures supported by four implants and double
crowns were retrospectively evaluated. A total of 20 patients who attended a professional maintenance
program were included. The mean follow-up period was 5.64 years. The cumulative implant survival rate was
98.75% (one implant lost) and the cumulative success rate was 88.75% (eight implants showed peri-
implantitis). The prosthesis survival rate was 100%, and the rate of technical maintenance required was
Take-home message: Double crown implant overdentures were found to be a promising treatment
alternative for rehabilitation of the edentulous maxilla, with limited biological and technical complications.

Курение - ухудшает имплантологический прогноз! Это как мантра. Я в этом всегда сомневался. Т.е. курить плохо - без вариантов, а вот импланты ставить можно и нужно - + удобная отмазка, чтоб не переделывать работу за бесплатно: "Ну, батенька, чтож Вы хотели - Вы же курильщик!"
Это исследование подвергает сомнению тезис о вреде для имплантов

Clin Oral Implants Res. 2013 May 7. doi: 10.1111/clr.12186. [Epub ahead of print]
Effects of tobacco smoking on the survival rate of dental implants placed in areas of maxillary sinus
floor augmentation: a systematic review.
Chambrone L, Preshaw PM, Ferreira JD, Rodrigues JA, Cassoni A, Shibli JA.
Key words: Dental implantation, endosseous, implant, osseointegration, smoking, systematic review
Medline, Embase and the Cochrane Oral Health Group Trials Register were searched for studies evaluating
survival of implants in maxillary sinus floor augmentation in smoking and non-smoking patients. The risk of
bias was assessed for the included studies. From a total of 3360 papers, eight were included in the analysis.
Smoking was found to have an adverse effect on implant survival in five (62.5%) of the studies, and a
significantly increased risk of implant failure was found in a meta-analysis of the outcomes of all included
studies. However, an analysis only using the three prospective studies did not demonstrate a significant
difference in implant failure between smokers and non-smokers.
Take-home message: Smoking was associated with implant failure in the overall meta-analysis, but
prospective data showed no significant difference.

Продолжу позже.
Последнее изменение pyramid; 08.06.2013 в 14:40.
Присоединился: Sep 2009
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pyramid Оффлайн
08.06.2013 в 09:25 Написал pyramid Врач Оффлайн 0+
#672282 — 08.06.2013 в 22:17 Re: Литературный обзор 01.06.13. (Продолжение) [Re: pyramid]  
Вот еще одно интересное исследование с 10 летним наблюдением за 8мм имплантами. Выживаемость 98%

Clin Oral Implants Res. 2013 Apr 28. doi: 10.1111/clr.12181. [Epub ahead of print]
Short (8-mm) locking-taper implants supporting single crowns in posterior region: a prospective clinical study with 1-to 10-years of follow-up.
Mangano FG, Shibli JA, Sammons RL, Iaculli F, Piattelli A, Mangano C.

Key words: Implant survival, implant-crown success, locking taper implants, short implants, single crowns, Leone Implant System
A total of 194 patients who received 215 short (8 mm) locking taper implants to support single-tooth restorations were followed for up to 10 years. There were three implant failures, giving cumulative implant survival rates of 98.4% and 98.5% at the patient and implant levels, respectively, while the implant-crown success rate was 95.8% and 95.9% at the patient and implant levels, respectively; two biologic and three prosthetic complications were reported. The mean distance from implant shoulder to first bone-to-implant contact was 0.31 ± 0.24 mm, 0.43 ± 0.29 mm and 0.62 ± 0.31 mm after 1, 5 and 10 years, respectively. Survival and success rates did not differ with age, gender, smoking, parafunction, bone type, or implant location or diameter.
Take-home message: Single-tooth replacement using short locking taper implants was shown to be a predictable treatment option.
Выглядит вот так.

Очень интересное исследование в котором испытывалась прочность конусного соединения с индексом и без него. Индекс значительно ослабляет соединение. Теперь понятно расстройство Коллег- пользователей Анкилоса в связи с отказом последнего от безиндексного соединения.

J Oral Implantol. 2013 May 3. [Epub ahead of print]
The effect of a positioning index on the biomechanical stability of tapered implant-abutment connections.
Villarinho EA, Cervieri A, Shinkai RS, Grossi ML, Teixeira ER.
Key words: Dental implants, Morse taper, positioning index, preload, mechanical cycling, Neodent
Solid or straight screw-retained abutments were placed on Morse taper implants. The abutments were either locked by the implant taper or had a positioning index to fit the internal hex of the implant. Abutment screw preload values were measured and crowns were placed and subjected to mechanical cycling. Significantly higher initial preload was observed for the non-indexed group, and this group also showed significantly less reduction of preload after cycling.
Take-home message: The results indicated that tapered abutments with a positioning index may be at greater biomechanical risk on functional loading.

Исследование посвященное PRP (обогащенная тромбоцитами плазма). Ставили по 2 имплантата на верхней челюсти с и без PRP. Смотрели 6-12-24-36 месяцев. В результате - с PRP была лучше первичная стабильность (интересно почему?), а в целом никакой разницы или выгод от методики не выявлено.

J Oral Implantol 2013 May; 39(S1):256-263.
Effect of platelet-rich plasma on the outcome of early loaded dental implants: a 3-year follow-up study.
Ergun G, Egilmez F, Cekic-Nagas I, Karaca &#304;R, Bozkaya S.
Key words: Primary stability, resonance frequency analysis, platelet-rich plasma, Straumann SLActive implants
Two implants were placed either with or without platelet-rich plasma (PRP) in the posterior region, or bilaterally to the median line, in the maxillae of patients; a total of 64 implants were placed. The PRP was prepared from the patients’ own blood using the Curasan PRP kit (Sarstedt, Germany). Implant stability was measured by resonance frequency analysis at placement and after 4 days and 1 week, after which the implants were loaded if they had an implant stability quotient (ISQ) > 60. Implant stability was repeated after 2, 3 and 4 weeks and after 6, 12, 24 and 36 months. There was one implant failure, but there were no prosthetic failures or complications. There were significant differences in implant stability between the PRP and non-PRP groups at implant placement, but there were no significant differences in the follow-up periods.
Take-home message: The use of PRP in the maxilla appeared to have no clinical benefit.

Узкие имплантаты (обычно это от 3,0 до 3,3), также как и короткие дают 98,7 % успеха за 5 лет и являются хорошей опцией там, где не проходят стандартные. Об этом следующее исследование.

J Oral Implantol 2013 May; 39(S1):273-279.
Radiographic evaluation of narrow diameter-implants after 5 years of clinical function.
Geckili O, Mumcu E, Bilhan H.
Key words: Narrow-diameter implants, marginal bone loss, dental implants, implant survival, fixed prosthesis, overdenture, Straumann, Astra Tech, Biolok, Dentsply Xive
A total of 159 narrow diameter implants placed in 71 patients were evaluated after 5 years in clinical function; survival and marginal bone levels were evaluated. There were two implant failures, giving an overall success rate of 98.74% and mean marginal bone loss was 1 mm and 0.98 mm on the mesial and distal sides of the implants, respectively. Patient age and gender, implant length and location, prosthesis type and marginal bone loss had no significant influence. Marginal bone loss was higher for Biolok implants, but the difference was significant only in comparison to Astra Tech implants.
Take-home message: Narrow diameter implants may be a predictable treatment option for situations where regular diameter implants may not be suitable and with comparable bone remodeling outcomes.

И последнее интересное исследование. Одиночные реставрации на имплантатах, особенно в области моляров показывают худшую выживаемость за 5 лет: 91,9%-общая и 87,6%- в области моляров. В целом осложнения на одиночках в области моляров наблюдались в 41,2% случаев.
Карл МИШ опять прав - если не хочешь проблем в дистальных отделах - связывай имплантаты вместе.

J Oral Rehabil. 2013 May 16. doi: 10.1111/joor.12065. [Epub ahead of print]
Cumulative survival rate and complication rates of single-tooth implant; focused on the coronal fracture of fixture in the internal connection implant.
Cha HS, Kim YS, Jeon JH, Lee JH.
Key words: Internal connection, abutment screw loosening, life table analysis, Astra Tech MicroThread OsseoSpeed implants
Patients previously treated with a total of 136 implants were retrospectively evaluated using a life table analysis to calculate 5-year cumulative survival. A total of 12 implants were lost and a further 11 were removed due to coronal fixture fracture, giving a cumulative survival rate of 91.9% for the whole jaw and 87.6% for the molar region. Cumulative survival rates were significantly different according to implant position but were not significantly different according to jaw, prosthesis type of gender. Complications were observed for 41.2% of implants in the posterior region.
Take-home message: The rate of coronal fracture of fixture and complications were relatively high, and survival rate was significantly influenced by implant position.
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pyramid Оффлайн
08.06.2013 в 22:17 Написал pyramid Врач Оффлайн 0+
#672283 — 08.10.2013 в 12:05 Re: Литературный обзор 01.10.13. (Продолжение) [Re: pyramid]  
Лето выдалось довольно бедненьким на интересные статьи - оно понятно - пора отпусков, кроме, пожалуй, материалов 5 согласительной конференции ITI. Но это тема для отдельной ветки. И так, поехали!

Интересное исследование от Грандов науки о качестве аутокости в зависимости от метода её забора. Наибольшее количество факторов роста и наилучшее качество аутографта получается при заборе крошки скребком и перемалывании костной мельницей, крошка, образующаяся при сверлении дрилем или пьезо, уступает по свойствам первым двум.

Clinical Implant Dentistry and Related Research
Clin Implant Dent Relat Res. 2013 Aug;15(4):481-489. doi: 10.1111/j.1708-8208.2012.00440.x. Epub 2012 Feb 29.
Impact of Bone Harvesting Techniques on Cell Viability and the Release of Growth Factors of
Key words: autogenous bone, bone dust, bone graft, bone mill, bone particles, bone scraper, bone slurry,
osteocyte, osteoinduction, piezosurgery
To test whether bone harvesting techniques have an impact on the number and activity of the transplanted
cells which contribute to the process of graft consolidation, the authors harvested porcine bone grafts by
bone mill, piezosurgery, bone drilling (bone slurry) and bone scraper. They found that cell viability and the
release of molecules affecting bone formation were higher in samples harvested by bone mill and bone
scraper when compared to samples harvested by bone drilling and piezosurgery. Gene expression was also
affected by the harvesting procedure, for example, bone mill and bone scraper samples revealed
significantly higher expression of growth factors compared with the two other means of harvesting.
Take-home message: Different harvesting techniques have different impact on the number and activity of
transplanted cells, which might influence the therapeutic outcome of bone augmentation procedures.

Качественное исследование для любителей транспозиций нижнечелюстного нерва и вообще сплит-технологий. Латерализировали, расщепляли гребень и сыпали в одной группе аутокрошку, в другом - не понятно какой именно, но ксено, типа Биоосса. Через год - везде почти одинаково и везде новая кость, что, в общем и так хорошо известно.

Clin Oral Implants Res. 2013 Sep;24(9):1060-4. doi: 10.1111/j.1600-0501.2012.02530.x. Epub 2012 Jul 13.
Alveolar osteotomy associated with resorbable non-ceramic hydroxylapatite or intra-oral
autogenous bone for height augmentation in posterior mandibular sites: a split-mouth prospective
Key words: autogenous bone graft, dental implants, inlay bone grafts, non-ceramic hydroxylapatite,
posterior mandible, segmented osteotomy
The authors evaluated implants placed in the mandibular area augmented by means of interpositional bone
grafts in a prospective, controlled split-mouth study using tomographic and Resonance Frequency Analyses
(RFA).The alveolar segmental osteotomies were assigned in two groups: test group, interpositional non-
ceramic hydroxyapatite bone graft, and control group, interpositional intra-oral autogenous bone graft.
Implants were placed after six months healing. Tomographic measurements of bone gain were recorded at
baseline and 6 months after surgery, when the implants were placed. At 12 months after osteotomy, RFA
were performed for each implant. The mean of bone gain 6.5 ± 2.4 mm and 7.0 ± 1.76 mm to control and
test group, respectively (P > 0.05). RFA values between groups were similar at baseline and 12 months
follow-up (P > 0.05).
Take-home message: Alveolar osteotomies in connection with sandwich interpositional bone grafts resulted
in bone formation over a period of 12 months, independent of the bone graft used.

Хорошее исследование про перфорации синусов. Из 40 синуслифтов в 15 порвали, а в 25 нет. Перфорации закрывали стандартно - мембраной и подсыпали - всем тем, что сыпем и мы. Результат - везде через 12 месяцев была хорошая кость, вне зависимости от того была перфо или нет. Ура,Товарищи!

J Periodontol. 2013 Aug;84(8):1094-9. doi: 10.1902/jop.2012.120458. Epub 2012 Nov 23.
Effect of Maxillary Sinus Membrane Perforation on Vital Bone Formation and Implant Survival: A
Retrospective Study
Key words: Bone grafting, dental implant, histology, sinus floor augmentation
The present retrospective study evaluates the percentage of vital bone and implant survival in sinuses that
had perforations repaired during surgery versus a non-perforated sinus group in.23 patients who had
undergone sinus augmentation procedure (SAP) with a total of 40 sinuses treated. Sinuses were grafted with
mineralized cancellous bone allograft, anorganic bovine bone matrix, or biphasic calcium phospate.
Perforation complications occurred in 15 sinuses with 25 non-perforated sinuses. All perforations were
repaired during surgery with absorbable collagen membrane barriers. Histologic cores were taken from all
treated sinuses 26 to 32 weeks after surgery. The implant success rate of 79 placed implants was recorded.
The average percentage of vital bone was 26.3% ± 6.3% in the perforated (repaired) sinuses versus 19.1% ±
6.3% in the non-perforated sinuses. The differences were statistically significant (SS). The implant success
rate was 100% (35 of 35) compared to 95.5% (43 of 45) in the perforated/repaired vs. non-perforated
sinuses, respectively. There was no SS difference in implant failure rates.
Take-home message: In this study, maxillary sinus membrane perforations, when properly repaired during
surgery, do not appear to be an adverse complication in terms of vital bone production or implant survival.
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pyramid Оффлайн
08.10.2013 в 12:05 Написал pyramid Врач Оффлайн 0+
#672284 — 14.11.2013 в 06:01 Re: Литературный обзор 01.10.13. (Продолжение) [Re: pyramid]  

Плохо знаю правила русского языка
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Fisher Оффлайн
14.11.2013 в 06:01 Написал Fisher Врач Оффлайн 0+
#672285 — 17.12.2013 в 18:56 Re: Литературный обзор 01.10.13. (Продолжение) [Re: pyramid]  
Супер. Спасибо
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Mane Оффлайн
17.12.2013 в 18:56 Написал Mane Врач Оффлайн 0+
#672286 — 19.02.2014 в 21:41 Re: Литературный обзор 01.01.14. (Продолжение) [Re: pyramid]  
Очень "урожайным" на суперинтересные исследования оказался конец 2013 года! ниже наиболее интеречные на мой взгляд:

№1. Бомба, на мой взгляд!

Clin Implant Dent Relat Res. 2013 Oct;15(5):645-53. doi: 10.1111/j.1708-8208.2011.00407.x. Epub 2011 Dec 15.
Risk of Prion Disease Transmission through Bovine-Derived Bone Substitutes: A Systematic Review
Key words: BSE diagnostic test, BSE prion inactivation, BSE prion infectivity, PrP(27-30), PrPSc, anorganic bovine bone substitutes, protein
Background: Despite the causal association between variant Creutzfeldt – Jakob disease and bovine spongiform encephalopathy (BSE), bovine origin graft materials are widely used during dental surgical procedures. The aim of this study was to assess the risk of BSE transmission through anorganic bovinebone substitutes.
Methods: Electronic database of MEDLINE was searched to identify relevant studies regarding our focused questions, presence of BSE prion infectivity in raw bovine bone, BSE prion inactivation by bone substitute manufacturing process, protein contents in anorganic bovine bone substitutes, and validity of current BSE diagnostic methods. Search terms yielded 1,704 titles. After title/abstract screening and duplicates removal, 36 full-text articles were screened for inclusion.
Results: A total of 16 studies were included in the final analysis. No eligible studies were identified regarding the efficacy of BSE prion inactivation by the treatments used for anorganic bovine bone manufacturing. BSE infectivity and PrPSc, pathological prion, were detected in bovine bone marrow and serum samples. Proteins were detected in Tutoplast® (bovine), Bio-Oss®, and tibia samples treated at the similar condition for Bio-Oss deproteinization. Inconsistent results of different BSE diagnostic tests were not unusual findings (Iwata et al. 2006; Arnold et al. 2007; Murayama et al. 2010), and a study by Balkema-Buschmann and colleagues showed an apparent discrepancy between BSE infectivity and detection of PrP(27-30), the current surrogate marker for prion disease infectivity.
Conclusion: This review indicates that bovine-derived graft biomaterials may carry a risk of prion transmission to patients.
Тутопласт и Биоосс, а также костные материалы обработанные по тому же принципу, как и Биоосс были исследованы на предмет возможности передачи прионов, вызывающих болезнь Крейцфельда-Якоби (губчатая энцефалопатия) - "коровье бешенство" помните?. Так вот вывод неутешителен - возможность передачи есть и обработка зло не убивает. Вот так-то.

№2. Про Церкон.

Clin Implant Dent Relat Res. 2013 Oct;15(5):769-78. doi: 10.1111/j.1708-8208.2011.00426.x. Epub 2012 Jan 11.
Comparison of Fracture Resistance and Fit Accuracy of Customized Zirconia Abutments with Prefabricated Zirconia Abutments in Internal Hexagonal Implants
Key words: CAD/CAM, fit, fracture resistance, internal connection implant, zirconia
Background: Customized zirconia abutments are increasingly applied for the fabrication of esthetic implant restorations aimed at imitating the natural situation. These abutments are individually shaped according to the anatomical needs of the respective implant site.
Purpose: This study sought to compare the fracture resistance and fit accuracy of prefabricated and customized zirconia abutments using an internal hexagonal implant system (TSV®, Zimmer, Carlsbad, CA, USA).
Materials and Methods: Two zirconia abutment groups were tested: prefabricated zirconia abutments (ZirAce, Acucera, Seoul, Korea) and customized zirconia abutments milled by the Zirkonzahn milling system. Twenty zirconia abutments per group were connected to implants on an acrylic resin base with 30-Ncm torque. The fracture resistance of zirconia abutments was measured with an angle of 30° at a crosshead speed of 1 mm/min using the universal testing machine (Z020, Zwick, Ulm, Germany). Marginal and internal gaps between implants and zirconia abutments were measured after sectioning the embedded specimens using a digital microhardness tester (MXT70, Matsuzawa, Tokyo, Japan).
Results: The customized abutments were significantly stronger (1,430.2 N) than the prefabricated abutments (1,064.1 N). The mean marginal adaptation of customized abutments revealed a microgap that was increased (11.5 &#956;m) over that in prefabricated abutments (4.3 &#956;m).
Conclusion: Within the limitations of this study, the customized abutments are significantly stronger than prefabricated abutments, but the fit is less accurate. The strength and fit of both abutments are within clinically acceptable limit.

Кратко так. Сравнивали заводской церкон абатмент на шестигранник и индивидуальный, выточенный на Цирконцане. Нагружали и ломали. Вывод. Цирконцан значительно прочнее, но точность прилегания меньше.

№3. Авторы - очень уважаемые и достойные ученые и врачи, и я их просто очень люблю. Но работа сама по себе то же что-то, т.к. старше, и такого уровня точности и объемности исследований и наблюдений за имплантатами Вы не найдете.

Clin Implant Dent Relat Res. 2013 Dec;15(6):780-90. doi: 10.1111/cid.12056. Epub 2013 Mar 18.
Long-term outcomes of dental implants with a titanium plasma-sprayed surface: a 20-year prospective case series study in partially edentulous patients
Key words: biological complications, crestal bone loss, dental implant, implant success rate, implant survival rate, peri-implant bone loss, prospective follow-up study, technical complications, titanium plasma sprayed
Background: Long-term studies of &#8805;10 years are important milestones to get a better understanding of potential factors causing implant failures or complications.
Purpose: The present study investigated the long-term outcomes of titanium dental implants with a rough, microporous surface (titanium plasma sprayed [TPS]) and the associated biologic and technical complications in partially edentulous patients with fixed dental prostheses over a 20-year follow-up period.
Materials and Methods: Sixty-seven patients, who received 95 implants in the 1980s, were examined with well-established clinical and radiographic parameters. Based on these findings, each implant was classified as either successful, surviving, or failed.
Results: Ten implants in nine patients were lost during the observation period, resulting in an implant survival rate of 89.5%. Radiographically, 92% of the implants exhibited crestal bone loss below 1 mm between the 1- and 20-year follow-up examinations. Only 8% yielded peri-implant bone loss of >1 mm and none exhibited severe bone loss of more than 1.8 mm. During the observation period, 19 implants (20%) experienced a biologic complication with suppuration. Of these 19 implants, 13 implants (13.7%) had been treated and were successfully maintained over the 20-year follow-up period. Therefore, the 20-year implant success rate was 75.8 or 89.5% depending on the different success criteria. Technical complications were observed in 32%.
Conclusion: The present study is the first to report satisfactory success rates after 20 years of function of dental implants with a TPS surface in partially edentulous patients.

Исследование по старым Штрауманнам с плазма напылением - наблюдение за пациентами 20 и более лет!
Выживаемость 89,5%, успех 75%.

На сегодня все. Рублюсь - пойду спать. Продолжение следует.
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pyramid Оффлайн
19.02.2014 в 21:41 Написал pyramid Врач Оффлайн 0+
#672287 — 25.02.2014 в 04:57 Про прионы [Re: pyramid]  
Ты знаешь, мне думается, что это заказуха.
Не в плане находок (после обработки остаются белки), а в плане выводов. И, как обычно, в отсутствие конкретных данных формулировка несет привкус многозначительной недосказанности.
Это исследование ставит своей целью пошатнуть Гайстлих... на него теперь будут ссылаться всласть все кому не лень. Скоро выйдет продолжение - пошло-поехало.

Согласись, корректнее было бы определить количество и остаточную вирулентность белков.
А потом сравнить с таковой в продуктах питания.
Потом задуматься о реальном риске схавать что то "заразное" - он на порядки выше
Потом поразмыслить об, куда ж без нее, мультифакториальности недуга, значении генетики и аутоимунных процессов в патогенезе... и так далее.
И только потом уже делать какие-то заключительные выводы

Пока получается, что исследователи пришли к подозрениям, которые возводятся в ранг почти что эвиденса
Как всегда: остается либо сомневаться в компетентности, либо в непредвзятости этих исследований
И, несмотря на засилие дебилов, я бы скорее усомнился в последнем
Что приводит к вопросу о реальной ценности публикации

Stay bonded!
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Lancet Оффлайн
25.02.2014 в 04:57 Написал Lancet ОдонтоЙатр Оффлайн 0+
#672288 — 25.02.2014 в 11:35 Re: Про прионы [Re: Lancet]  
Дима, я не склонен здесь видеть заговор против Гейстлиха конкретно. Ты же знаешь, что в США про этот бренд вообще немногие знают, а графты там тоннами кладут и это рынок Номер 1 в мире. Это исследование вообще компрометирует и ксено и алло. Это же просто исследование - не нравится не ешь. Я лично как пользовался ало и ксено так и буду пользоваться, хотя бы потому, что тема с прионами вообще мутная. Другой вопрос, что для литобзора это интересно, поэтому и включил.
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pyramid Оффлайн
25.02.2014 в 11:35 Написал pyramid Врач Оффлайн 0+
#672289 — 07.09.2015 в 09:06 Re: Литературный обзор 01.01.14. (Продолжение) [Re: pyramid]  
Давненько не постил в этой ветке. А литературы вышло много - в основном мусор. Кафедральные графоманы и распильщики грантов это не только "наше всё" - там на Западе то же не дураки сидят .

Но, все-таки, даже в мутном и полноводном море публикаций иногда встречаются не плохие статьи и обзоры.

Clin Oral Implants Res. 2015 Aug;26(8):964-82. doi: 10.1111/clr.12428. Epub 2014 Jun 11.
Clinical efficacy of immediate implant loading protocols compared to conventional loading depending on the type of the restoration: a systematic review.
Sanz-S&#225;nchez I1, Sanz-Mart&#237;n I1, Figuero E1,2, Sanz M1,2.
Author information
Immediate loading has become a predictable option to restore all clinical situations. The aim of this systematic review was to assess whether immediate loading protocols achieve comparable clinical outcomes when compared to conventional loading protocols depending on the type of prosthetic restoration.
A protocol was developed aimed to answer the following focused question: "What are the effects of immediate implant loading protocols compared to conventional implant loading, in terms of implant failure, marginal bone levels, and biological and mechanical complications based on the type of restoration?" The next subanalysis were performed as follows: the extent, type, and material of the restoration and the type of occlusal contact in function. This systematic review only included randomized controlled trials (RCTs) with a follow-up of at least 6 months after implant loading.
Thirty-seven final papers were included. The results from the meta-analyses have shown that the immediately loading implants demonstrated a statistically significant higher risk of implant failure [RR = 1.92; 95% CI (1.04; 3.54); P = 0.036], a statistically significant lower bone loss [WMD = 0.046; 95% CI (0.043; 0.049); P = 0.000] and a smaller increase in ISQ values [WMD = -1.096; 95% CI (-1.615; -0.577); P < 0.001, although both groups attained high survival rates (98.2% in the test and 99.6% in the control). Single teeth implants were greater risk of failure, when compared to immediately loaded full arch restorations (RR = 2 vs. 0.9), so as the occlusal pattern when compared to non-occlusal (RR = 1.9 vs. 1.4).
Immediate loading may impose a greater risk for implant failure when compared to conventional loading, although the survival rates were high for both groups.

Статья не прорывная, но грамотная, а также респект издателю и авторам - её можно скачать целиком бесплатно.

Основное - немедленная установка и нагрузка хорошая вещь, НО! Риск потери импланта выше, чем в случае со стандартным 2-х этапным протоколом.

Int J Oral Maxillofac Implants. 2015 Jul-Aug;30(4):931-6. doi: 10.11607/jomi.4067.
The Effect of Vertical Implant Position in Relation to Adjacent Teeth on Marginal Bone Loss in Posterior Arches: A Retrospective Study.
Mailoa J, Fu JH, Chan HL, Khoshkam V, Li J, Wang HL.
The aim of this retrospective study was to investigate the possible association between peri-implant marginal bone loss and the apicocoronal (vertical) positioning of dental implants placed adjacent to a tooth.
Dental records at the University of Michigan, School of Dentistry, were screened. To be included in the study, the patient had to have at least one implant in the premolar or molar region, unilaterally or bilaterally, in either arch, with an immediately mesial adjacent tooth. The implant had to have been functionally loaded for at least 3 years after crown insertion, and clear, nondistorted periapical films had to be available. Several landmarks were identified: the cementoenamel junction (CEJ) and crestal bone (CB) of the tooth adjacent to the implant, the implant platform (PL), and the first radiographic implant-bone contact (BL). The following parameters were measured: CEJ-PL, CEJ-CB, CB-PL, horizontal distance between the adjacent tooth and PL (HD), and vertical distance between BL and the first implant thread at the mesial (BL-m) and distal (BL-d) implant surfaces.
A total of 139 patients with a mean age of 62.1 ± 9.3 years were included. The mean follow-up period was 4.42 ± 2.5 years. When the implant was placed more than 3 mm apical to the CEJ of the adjacent tooth, significantly greater peri-implant bone loss occurred at the mesial (difference of means = 0.57 mm) and distal (difference of means = 0.83 mm) implant surfaces.
In this study population, implants placed in the posterior area with a vertical distance greater than 3 mm from the CEJ of the adjacent tooth displayed more peri-implant bone loss. Further investigation is required to determine whether this increased peri-implant bone loss predisposes a site to peri-implantitis.

Отличное исследование - привет всем любителям Анкилоса и суб-суб крестальной установки имплантатов.
Коротко так в боковом отделе при погружении платформы ниже 3 мм от уровня цементно-эмалевого соединения соседних зубов потеря кости растет значительно.


Int J Oral Maxillofac Implants. 2015 Jul-Aug;30(4):834-42. doi: 10.11607/jomi.3947.
Microbiologic and Clinical Findings of Implants in Healthy Condition and with Peri-Implantitis.
Canullo L, Pe&#241;arrocha-Oltra D, Covani U, Rossetti PH.
To compare implants in healthy conditions and implants with peri-implantitis with regard to their clinical parameters and the microbiologic composition at the peri-implant sulcus, inside the implant connection, and the gingival sulcus of neighboring teeth.
A cross-sectional study was performed including consecutive patients with implants in healthy conditions and with peri-implantitis. Clinical parameters for which patients were screened included bleeding on probing, pocket depth, and plaque index at six sites. Samples for microbiologic analysis were obtained from three locations: the peri-implant sulcus, inside the implant connection, and the gingival sulcus of neighboring teeth. Quantitative real-time polymerase chain reaction (PCR) was carried out for total counts of 10 microorganisms: Aggregatibacter actinomycetemcomitans, Porphyromona gingivalis, Tanerella forsythia, Tanerella denticola, Prevotela intermedia, Peptostreptococcus micros, Fusobacterium nucleatum, Campylobacter rectus, Eikenella corrodens, and Candida albicans. The response variables were the percentage of positive sites and total bacterial counts.
One hundred twenty-two implants in 57 patients were analyzed in the healthy group and 113 implants in 53 patients in the peri-implantitis group. Differences between the groups were statistically significant for bruxism, probing pocket depth, bleeding on probing, and radiographic bone level. Orange complex species (P intermedia, P micros, F nucleatum) were the most prevalent in the three types of sites for both groups, and prevalence values were higher in the peri-implantitis group. Differences in prevalence between groups were more marked inside the connection than in the peri-implant sulcus. Absolute loads of most microbes and total bacterial counts were higher for the peri-implantitis group in the three locations. Again, differences were bigger inside the connection than at the peri-implant sulcus. Significant interactions were found for prevalence and absolute microbial loads between groups and locations, and for the interaction of group &#215; location.
Clinical and microbiologic differences were observed between healthy subjects and those with peri-implantitis. Microbiologic differences between groups were more marked inside the connection than in the peri-implant sulcus. The potential role of the implant connection as a microbial reservoir for peri-implant diseases and in the outcome of their treatment should be confirmed with further studies.

Коротко так - при перимиплантите уровень и концентрация патогенной флоры не значительно отличается от нормы в сулькусе, зато значително растет колическтво "заразы" в соединении имплантат-абатмент. Это и есть резервуар инфекции при имплантите. И, эта.. Не надо втирать про то, что есть соединения, которые не текут - конус Морзе, Анкилос, бла-бла-бла. Это все разговоры в пользу бедных - течет ВСЕ!

№4. 2 статьи об одном и том же.

Clin Implant Dent Relat Res. 2015 Aug;17(4):724-31. doi: 10.1111/cid.12175. Epub 2013 Nov 17.
Effect of Crown to Implant Ratio and Anatomical Crown Length on Clinical Conditions in a Single Implant: A Retrospective Cohort Study.
Sun SP1, Moon IS1, Park KH2, Lee DW1.
Author information
The aim of this retrospective cohort study was to evaluate the long-term influence of the crown-to-implant (C/I) ratio and anatomical crown length on clinical conditions around Astra single dental implants placed in the premolar and molar regions.
Seventy-six subjects were selected from patients who had been treated with single Astra implants for replacement of missing premolars and molars. The peri-implant marginal bone level change was assessed 1 year after functional loading and 6 years after functional loading. To predict the peri-implant marginal bone level change using clinical and radiographic data, a multiple linear regression model was applied. The Wilcoxon rank sum test was used to analyze difference median in technical complications.
The C/I ratio and anatomical crown length were not associated with peri-implant marginal bone loss or changes in the bone level at 6 years (p&#8201;=&#8201;.48, p&#8201;=&#8201;.31). However, the modified plaque index, modified sulcus bleeding index, and smoking status influenced the peri-implant marginal bone loss (p&#8201;<&#8201;.05, r(2) &#8201;=&#8201;0.54). In addition, the patient with technical complication group did show significantly increased anatomical crown length (p&#8201;<&#8201;.05) CONCLUSIONS: The higher C/I ratio and anatomical crown length did not increase the risk of peri-implant marginal bone loss during 6 years of functional loading. In addition, higher anatomical crown lengths are associated with higher technical complications.

J Oral Implantol. 2015 Jul;41 Spec No:346-51. doi: 10.1563/AAID-JOI-D-D-14-00021.
Does Abutment Collar Length Affect Abutment Screw Loosening After Cyclic Loading?
Siadat H1, Pirmoazen S2, Beyabanaki E1, Alikhasi M1.
Author information
A significant vertical space that is corrected with vertical ridge augmentation may necessitate selection of longer abutments, which would lead to an increased vertical cantilever. This study investigated the influence of different abutment collar heights on single-unit dental implant screw-loosening after cyclic loading. Fifteen implant-abutment assemblies each consisted of an internal hexagonal implant were randomly assigned to 3 groups: Group1, consisting of 5 abutments with 1.5 mm gingival height (GH); Group2, 5 abutments with 3.5 mm GH; and Group3, 5 abutments with 5.5 mm GH. Each specimen was mounted in transparent auto-polymerizing acrylic resin block, and the abutment screw was tightened to 35 Ncm with an electric torque wrench. After 5 minutes, initial torque loss (ITL) was recorded for all specimens. Metal crowns were fabricated with 45° occlusal surface and were placed on the abutments. A cyclic load of 75 N and frequency of 1 Hz were applied perpendicular to the long axis of each specimen. After 500&#8201;000 cycles, secondary torque loss (STL) was recorded. One-way ANOVA analysis was used to evaluate the effects of abutment collar height before and after cyclic loading. One-way ANOVA showed that ITL among the groups was not significantly different (P = .52), while STL was significantly different among the groups (P = .008). Post-hoc Tukey HSD tests showed that STL values were significantly different between the abutments with 1.5 mm GH (Group1) and with 5.5 mm GH (Group3) (P = .007). A paired comparison t-test showed that cyclic loading significantly influenced the STL in comparison with the ITL in each group. Within the limitations of this study, it can be concluded that increase in height of the abutment collar could adversely affect the torque loss of the abutment screw.

Соотношение имплантат-коронка никак не влияет на потерю кости, т.е. если абатмент с коронкой длиннее имплантат в 2 раза - это не приведет к потери кости.
А вот риск раскруток, переломов винта и проч. проблем с реставрацией выше.

Пока все - продолжение следует.
Присоединился: Sep 2009
Посты: 3,647
pyramid Оффлайн
07.09.2015 в 09:06 Написал pyramid Врач Оффлайн 0+
#672290 — 08.09.2015 в 08:29 Re: Литературный обзор 01.01.14. (Продолжение) [Re: pyramid]  
И еще немного.

Quintessence Int. 2015 Jul-Aug;46(7):583-9. doi: 10.3290/j.qi.a34077.
Retrospective analysis of loosening of cement-retained vs screw-retained fixed implant-supported reconstructions.
Korsch M, Walther W.
The cementation of fixed dental prostheses (FDPs) on implants involves the risk of undetected excess cement. If a zinc oxide-eugenol cement (ZEC) is used as the luting material, this risk appears to be lower, as the excess cement will dissolve in the peri-implant sulcus. However, using a ZEC on a general basis conflicts with the manufacturers' classification of a ZEC as a temporary luting material. To evaluate the clinical safety of ZECs, the present study investigated whether more ZECretained reconstructions than screw-retained reconstructions loosen over time.
In a retrospective observational study, the frequency of FDP loosening was investigated. For this purpose, data from patients who had been fitted with FDPs on two or more than two posterior implants were investigated. The study compared screw-retained (n = 59) vs cement-retained (n = 40) FDPs on implants over an observation period of 3.5 years after reconstruction incorporation. All cement-retained FDPs had been cemented with a temporary ZEC.
The prevalence of reconstruction loosening was significantly lower for cement-retained FDPs when a ZEC (10%) was used than it was for screw-retained FDPs (29%); four screw-retained FDPs and one cementretained FDP developed major complications. The survival rate of the reconstructions within the observation period was 97% for screw-retained FDPs and 100% for cement-retained FDPs (not significant).
The prevalence of cementretained FDP loosening was significantly lower than that of screw-retained FDPs. Cementing FDPs on implants using a temporary cement does not necessarily lead to a higher number of loosened reconstructions. Permanent cementation with ZEC appears to be justified.

Исследование из серии что лучше - цементная или винтовая фиксация?
Всего было около 100 реставраций, установленных в боковом отделе, разделенных пополам и со сроком наблюдений 3,5 года.
Победили реставрации на цементной фиксации на цинко-оксид-эвгеноловый временный цемент.Успех - 100%. Винтовые - раскручивались. Успех - 97%. Хммм.....

J Oral Maxillofac Surg. 2015 Jul;73(7):1275-82. doi: 10.1016/j.joms.2015.01.039. Epub 2015 Feb 12.
Risk Factors of Membrane Perforation and Postoperative Complications in Sinus Floor Elevation Surgery: Review of 407 Augmentation Procedures.
Schwarz L1, Schiebel V1, Hof M2, Ulm C3, Watzek G4, Pommer B5.
Author information
1Resident, Bernhard Gottlieb School of Dentistry, Medical University of Vienna, Austria.
2University Assistant, Bernhard Gottlieb School of Dentistry, Medical University of Vienna, Austria.
3Interim Head, Division of Oral Surgery, Bernhard Gottlieb School of Dentistry, Medical University of Vienna, Austria.
4Former Head of the Division of Oral Surgery, Bernhard Gottlieb School of Dentistry, Medical University of Vienna, Austria; Academy for Oral Implantology, Vienna, Austria.
5Associate Professor, Bernhard Gottlieb School of Dentistry, Medical University of Vienna, Austria; Academy for Oral Implantology, Vienna, Austria. Electronic address: pommer@implantatakademie.at.
To test patient- and sinus-related risk factors for an association with intraoperative membrane perforation and postoperative complications after sinus floor augmentation surgery.
Sinus floor elevation procedures using a lateral approach were retrospectively analyzed for patients' medical history and sinus anatomy on computed tomographic scans. Complications per sinus after membrane elevation and augmentation using a mixture of autologous bone and deproteinized bovine bone substitute (Bio-Oss) were recorded. Logic regression (adjusted using the generalized estimation equation approach) was performed to analyze the influence of patient age, gender, smoking habits, sinus septa, residual bone height, and mesiodistal elevation width.
Of 407 sinus grafts in 300 patients (mean age, 56 yr), perforation of the Schneiderian membrane occurred in 35 sinuses (8.6%) and was significantly associated to the presence of sinus septa (odds ratio [OR] = 4.8; P = .002) and decreased residual bone height (OR = 0.01; P < .001). Smoking increased the risk of membrane perforation (OR = 4.8; P = .002), sinusitis (OR = 12.3; P < .001), and wound dehiscence (OR = 16.1; P = .005). Cases of sinus membrane perforation had higher odds for postoperative sinusitis (OR = 10.5; P < .001). The probability of wound dehiscence increased with the size of the elevated area (OR = 3; P < .001).
The results of the study suggest that the presence of sinus septa and residual bone height less than 3.5 mm are the main risk factors increasing sinus membrane perforation rates. There was a higher prevalence for sinusitis in cases of membrane perforation (31.4%) despite intraoperative closure with resorbable membranes (Bio-Guide). Smokers generally exhibited greater chances for complications.

Исследование клиническое об открытых синуслифтах. Сыпали Биоосс с ауто. Мембрану равли в 35 % случаев. Главные причины синуситов - разрыв мембраны. Вероятность повреждения мембраны значительно выше при наличии: септ, толщина кости меньше 3,5 мм и у курильщиков. Лечится - Биогайдом.
Хорошая статья, только слишком много рекламы Гайстлиха - нерукопожатненько как-то.
Присоединился: Sep 2009
Посты: 3,647
pyramid Оффлайн
08.09.2015 в 08:29 Написал pyramid Врач Оффлайн 0+
#672291 — 28.12.2015 в 19:54 Re: Литературный обзор 01.01.14. (Продолжение) [Re: pyramid]  
Низкий поклон! Хорошее дело делаете.

Недостаточно смотреть на ступени, ведущие вверх, по ним надо подниматься.
Присоединился: Jan 2012
Посты: 96
Dr_AB Оффлайн
28.12.2015 в 19:54 Написал Dr_AB Врач Оффлайн 0+

Модерируется  dikon 

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