Peri-implant bone loss around single and multiple prostheses: systematic review and meta-analysis.

PURPOSE: The objective of this systematic review and meta-analysis was to assess and compare the marginal bone loss around implants supporting single fixed prostheses and multiple-unit screw-retained prostheses. MATERIALS AND METHODS: The literature was searched manually and electronically to identify studies in which the marginal peri-implant bone loss around single-implant prostheses and screw-retained multiple-implant prostheses was evaluated radiographically. Two reviewers independently selected the literature and extracted the data. The random-effects method was used to obtain estimates of marginal peri-implant bone loss (means and 95% confidence intervals [CIs]). RESULTS: Of the 2,107 studies identified by a preliminary search, 17 fulfilled the inclusion criteria; 7 were related to single-implant prostheses and 10 to multiple-implant screw-retained fixed prostheses. The mean marginal peri-implant bone loss was 0.9 mm (95% CI, 0.49 to 1.32 mm) for multiple-implant screw-retained prostheses and 0.58 mm (95% CI, 0.37 to 0.80 mm) for single-implant prostheses. CONCLUSION: This indirect comparison provided no evidence to support the assertion that there are differences in marginal peri-implant bone loss between single implant prostheses and multiple screw-retained prostheses.

Importância da tensão na perda óssea marginal ao redor de implantes / The importance of the stress in the marginal bone loss around implants

Uma das principais causas de complicações na implantodontia relaciona-se à concentração de tensões perimplantares. A compreensão da etiologia destas complicações é muito importante para minimizar a perda óssea marginal. O objetivo deste trabalho foi realizar uma revisão bibliográfica correlacionando as tensões com alguns fatores biomecânicos como projeto do implante, tipo de carga oclusal, localização do implante e desajuste protético, verificando-se quais as possibilidades de minimizar a tensão na interface implante-osso

One of the most important causes of complication in implantology is related to the peri-implant stress concentration. The etiology comprehension of these complications is very important to minimize the bone loss. The aim of this study was to realize a literature review to correlate the stress with some biomechanical factors as implant design, type of occlusal load, implant localization and prosthetic misfit, to verify the possibilities to minimize the stress in the bone to implant interface