Effect Of Different Implant Abutment Mismatch Sizes On Marginal Bone Loss U00f1 Prospective Clinical Trial

Download or read book Effect of Different Implant-abutment Mismatch Sizes on Marginal Bone Loss U00f1 Prospective Clinical Trial written by Oliveira Guilherme and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Background: The horizontally inward repositioning of the implant-abutment interface, so called platform-switching (PS), has been suggest as capable of reducing the periimplant marginal bone loss. However, PS has been a generic term used for different implant-abutment mismatch sizes, among the studies. It is yet not well understood to which extent different mismatch size may influence the extension of marginal bone preservation for PS implants. Aim: To evaluate the effect of different implant-abutment mismatch sizes on marginal periimplant bone loss. Materials and methods: Twelve patients received four u00d8 4.5 x 13 mm external hex implants, and abutments diameters of 4.5 mm (conventional matching implant-abutment design u2013 CMD), 4.1 mm (PS04), 3.8 mm (PS07) and 3.3 (PS12), randomly placed based on a split-mouth design. Clinical parameters were evaluated at 6 sites around the implants, at a 12, 36, and 60 months follow-up. The distance from the top of the implant to the first bone-to-implant contact u2013 IT-FBIC was evaluated on standardized digital peri-apical radiographs acquired at 1, 3, 6, 12, 36 months follow-up. Comparison among multiple periods of observation were performed using repeated-measures Analysis of Variance (ANOVA), followed by a Tukey post-hoc test, while two-period based comparisons were made using paired t-test. Further, 12 computer-tomographic based finite element (FE) models were accomplished and the results for the peak EQV strain in periimplant bone were interpreted by means of ANOVA. Results: After 3 years follow-up, the variation in periimplant bone loss assessed from the radiographs was different between CMD (1.88 u00b1 0.41), PS07 (1.14 u00b1 0.94) and PS12 (0.74 u00b1 0.58), p