Open or submerged healing of implants with platform switching: a randomized, controlled clinical trial.

Autor:	Enkling, Norbert, Jöhren, Peter, Klimberg, Torben, Mericske-Stern, Regina, Jervøe-Storm, Pia-Merete, Bayer, Stefan, Gülden, Norbert, Jepsen, Søren
Předmět:	BONE physiology HYPOTHESIS COMPUTER software INDUSTRIAL contamination STATISTICAL correlation DENTAL implants LONGITUDINAL method MEDICAL equipment INDUSTRIAL research STATISTICAL sampling STATISTICS DENTAL radiography WOUND healing SAMPLE size (Statistics) DATA analysis STATISTICAL significance RANDOMIZED controlled trials HUMAN research subjects BLIND experiment PATIENT selection
Zdroj:	Journal of Clinical Periodontology; Apr2011, Vol. 38 Issue 4, p374-384, 11p, 1 Color Photograph, 1 Black and White Photograph, 1 Diagram, 5 Charts, 1 Graph
Abstrakt:	Aim: The temporal pattern of bone-level alterations in conventionally restored implants is dependent upon healing mode (open or submerged). This study examined the influence of healing on marginal bone levels at implants with a medium-rough surface including the implant collar and a clearance-fit implant-abutment connection restored according to a platform-switching concept. Material and Methods: Two implants were placed in the posterior mandible of 21 test subjects, randomly assigned to open (OH) or submerged (SH) healing. Standardized radiographs were obtained after implant surgery, before re-entry, after crown mounting, 1 and 2 years after implant surgery, and evaluated for implant-bone-level alterations (ΔIBL). Bacterial samples of the implants' inner cavities were analysed by cultivation. Statistics: Brunner-Langer Model, equivalence testings by Wilcoxon's (equivalence range ± 0.4 mm). Results: After 2 years, ΔIBL were -- 0.47 ± 0.46mm (OH) and --0.54 ± 0.38mm (SH). At the 1-year follow-up, all implants were contaminated with bacteria. ΔIBL (p < 0.001) and the amount of bacterial contamination (p < 0.001) significantly depended on time, but not on healing mode. ΔIBL of OH and SH were equivalent at all time points (all p ≤ 0.044). Conclusions: Platform-switched implants showed very limited peri-implant bone-level alterations. The healing-mode neither affected the total amount nor the temporal patterns of ΔIBL. Thus, the results for the tested implants with a non-rigid implant--abutment connection were similar to results reported previously for implants with a rigid implant-abutment connection. [ABSTRACT FROM AUTHOR]
Databáze:	Complementary Index
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