Overtures in the edentulous mandible supported by implants and retained by a Dolder Bar: A 5-year prospective study

摘要

Purpose: This prospective study was performed to evaluate the outcomes of XiVE? S plus implants (Dentsply Friadent, Mannheim, Germany) following conventional restoration with bar structures and overdentures in the edentulous mandible. Materials and Methods: A total of 39 patients were treated with four interforaminal implants (n=156) splinted by a Dolder bar. Overdentures were attached to the bars after 3months of healing. As primary outcome measures, clinical and radiological parameters were evaluated at the time of implant placement (baseline) and once a year (1, 2, 3, 4, 5years) after functional loading. Secondary outcome measures included (i) primary stability and surgical complications, as well as (ii) Periotest? (Medizintechnik Gulden, Modautal, Germany) values, implant survival, and prosthetic complications at baseline and follow-up. Results: A total of 156 implants were placed. The vast majority (n=149) were tightened to >30Ncm, while torques in the range of 20-30Ncm were obtained in the remaining cases (n=7). Mean crestal bone levels around the implants were 0.41mm at baseline and 1.04/1.20/1.34/1.45/1.44mm after 1/2/3/4/5years respectively. The mean values of the plaque, calculus, bleeding, and mucosal indices remained low throughout this period. The reported follow-up periods involved one implant loss after 3months (survival rate: 99.4%) and one implant failure after 4years (success rate: 98.4%). Prosthetic complications included factures of bars (n=3) and denture teeth (n=7). Prosthetic survival was 100%. Conclusions: Dolder bars to restore oral implants in the edentulous mandible appear to offer a high rate of implant survival, good stability of the peri-implant tissue, and a low rate of prosthetic complications.