Abstract
Objective : Implant prostheses contribute to the recovery of oral functions, nevertheless the lack of periodontal membrane might have a significant influence on antagonistic teeth. In this study, we investigated the factors associated with implant antagonistic natural tooth loss in long-term follow-up cases.
Methods : This retrospective clinical study included 358 patients (237 females, 121 males, average age of 65.8 years) who were rehabilitated with fixed implant prostheses in the molar region between 2005 and 2008, and who have been followed for 10 years or more. 700 implants (maxilla : 397, mandible : 303), 358 prostheses (maxilla : 201, mandible : 157) and 667 antagonists (maxilla : 378, mandible : 289) were investigated. The primary outcomes were the survival rates of implants, implant prostheses and antagonists. The secondary outcomes were X-ray film analysis of the antagonist's position (maxilla or mandible), antagonist's vitality (vital or non-vital), history of periodontitis, and gonial angle. Statistical analysis was performed with the binary logistic-regression analysis (p＜0.01).
Results : A total of 10 implants/8 patients, 0 prosthesis, and 62 antagonists/32 patients were lost. The survival rates of implants, prostheses and antagonists were 98.5, 100, and 90.7%, respectively. A statistically significant difference was observed for history of periodontitis (p＜ 0.01) and gonial angle (p＜ 0.01) at the patient level, while it was observed for vitality of antagonist (p＜ 0.01), history of periodontitis (p＜ 0.01) and gonial angle (p＜ 0.01) at the antagonist level. No significant difference was observed for antagonist position (p = 0.1304).
Conclusions : It is suggested that vitality of antagonist, history of periodontitis and gonial angle have significant influences on antagonistic teeth in implant prostheses.
