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The influence of initial mucosal thickness on crestal bone change in similar macrogeometrical implants: a prospective randomized clinical trial
Author(s) -
Eekeren Paul,
Elsas Pieter,
Tahmaseb Ali,
Wismeijer Daniel
Publication year - 2017
Publication title -
clinical oral implants research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.407
H-Index - 161
eISSN - 1600-0501
pISSN - 0905-7161
DOI - 10.1111/clr.12784
Subject(s) - dentistry , medicine , implant , significant difference , abutment , buccal administration , orthodontics , surgery , civil engineering , engineering
Objective The objective of this study was to evaluate crestal bone changes around bone‐ and tissue‐level implants related to initial mucosal thickness. Materials and methods Patients received at least 2 implants: one with the prosthetic abutment connection at the crestal bone level ( MC ) and one with the prosthetic abutment connection at 2.5 mm supra crestal ( LC ). Flap thickness measurements were taken using a periodontal probe after raising the buccal flap. Patients were divided into 2 groups according to the mucosal thickness—Group A (thickness, ≤2 mm) and Group B (thickness, >2 mm). Results Our study included 33 patients and 78 implants. Each patient received at least 1 implant of each type: Group A (MC), 17 implants, with a mean bone change of −0.6 ± 0.5 mm; Group B (MC), 20 with a mean bone change of −0.2 ± 0.4 mm; Group A (LC), 15 with a mean bone change of −0.1 ± 0.5 mm; and Group B (LC), 22 with a mean bone change of −0.2 ± 0.4 mm. A paired‐samples t ‐test for groups A (MC) and B (MC) yielded a statistically significant difference ( P  =  0 .003); there was no statistically significant difference for groups A (LC) and B (LC) ( P  =  0 .518). Conclusion If the initial mucosal thickness surrounding bone‐level implants is more than 2 mm, there is significantly less crestal bone change compared with bone‐level implants placed in initial mucosal thicknesses of 2 mm or less. This difference is not statistically significant when tissue‐level implants are used and the implant–abutment connection is 2.5 mm above the crestal bone level.

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