Retrospective study on survival, success rate and complication of implant supported fixed prosthesis according to the materials in the posterior area
Purpose: The purpose of this study was to retrospectively investigate the survival and success rate of implant supported fixed prosthesis according to the materials in the posterior area. Other purposes were to observe the complications and evaluate the factors affecting failure. Materials and methods: Patients who had been restored implant prosthesis in the posterior area by the same prosthodontist in the department of prosthodontics, dental hospital, Chonbuk National University, in the period from January 2011 to June 2018 were selected for the study. The patient's sex, age, material, location, type of prosthesis and complications were examined using medical records. The KaplanMeier method was used to analyze the survival and success rate. The Log rank test was conducted to compare the differences between the groups. Cox proportional hazards model was used to assess the association between potential risk factors and success rate. Results: A total of 364 implants were observed in 245 patients, with an average follow up of 17.1 months. A total of 5 implant prostheses failed and were removed, and the 3 and 5 year cumulative survival rate of all implant prostheses were 97.5 and 91.0, respectively. The 3 and 5 year cumulative success rate of all implant prostheses were 61.1% and 32.9% respectively. Material, sex, age, location and type of prosthesis did not affect success rate (P>.05) Complications occurred in the order of proximal contact loss (53 cases) retention loss (17 cases) peri implant mucositis (12 cases) infraocclusion (4 cases) and so on. Conclusion: Considering a high cumulative survival rate of implant supported fixed prostheses, regardless of the materials, implant restored in posterior area can be considered as a reliable treatment to tooth replacement. However, regular inspections and, if necessary, repairs and adjustments are very important because of the frequent occurrence of complications. (J Korean Acad Prosthodont 2019;57:342 9)