A prospective multicenter clinical investigation of a bone quality-based dental implant system.

This article reports the 5-year interim results of an independently monitored, prospective, multicenter clinical trial of a bone quality-based implant design. At six study centers, 495 implants were placed in 151 cases with an average follow-up period of 1.6 years (range: 1.0-3.6 years) after prosthesis delivery. The majority of the implants were placed in D2 or D3 bone to support fixed partial dentures or implant-supported overdentures. Using strict success criteria, there were three implant failures, resulting in a cumulative 99.5% success rate according to Kaplan-Meier survival analysis. Radiographic analysis revealed a mean bone loss of 0.06 mm at 1 year and a bone gain of 0.04 mm at 2 years after prosthesis loading. There were no statistical differences in the results by center, implant type, bone density, area of the mouth, or prosthesis type. The results of this 5-year study revealed a high success rate and limited crestal bone loss in all bone densities by the use of an implant specifically designed for the varying biomechanical conditions and bone quality associated with the human maxilla and mandible.