2018 Volume 38 Issue 3 Pages 198-206
The purpose of the present study was to examine the influence of medical history of periodontal disease on the outcomes of treatment with implants with modified titanium surfaces. Placed in 124 patients were a total of 425 implants with titanium surfaces modified by wire electrical discharge machining. Of those patients selected were the patients whose implant superstructures had stayed in place for 8-20 years; the subjects were then divided into two groups, with (Group A) and without medical history of periodontal disease (Group B) according to the alternative method described by Hardt et al. The clinical courses of the implant treatment provided to each group were evaluated. The group with medical history included 41 patients with a total of 154 implants. The mean observation period was 13.8 years in Group A, and the number of implants that were removed during the observation period was 15 (9.7％). Additionally, bone resorption of more than 3 mm in the mesial and distal sites of the peri-implant marginal bone was observed in 13 implants (8.4％) although the bodies had not been removed. On the other hand, Group B included 41 patients with a total of 129 implants, and the mean observation period was 14.1 years. Four implants (3.1％) were removed during the observation period. Additionally, bone resorption of more than 3 mm in the mesial and distal sites of the periimplant marginal bone was observed in 3 implants (2.3％) although the bodies had not been removed. Consequently, Group A presented an implant survival rate of 90.3％ and a success rate of 81.8％ while in Group B the survival rate and success rate were 96.8％ and 94.6％, respectively. Thus, there were significant differences in the survival rate and the success rate between the two groups. Additionally, the removal of implants and the bone resorption in the peri-implant-neck marginal sites without causing implant removal occurred more frequently in Group A.
