抄録
Marginal bone level is important for long-term evaluation after implant treatment and it is necessary to know what factors affect the risk of peri-implant bone loss. The aim of this study was to examine the risk factors for peri-implant bone loss around fixed prostheses supported by dental implants regarding marginal bone level changes. The subjects were 501 patients (170 males and 331 females, mean age:56.9 years) who received fixed partial prostheses supported by dental implants and who were examined by routine recall after loading. The average monitoring period after loading was 8.8 years. We measured marginal bone level changes around implants from radiograph images using the Image J software program. We also examined the effect of the factors on periimplant marginal bone loss. The factors included status of remaining teeth and antagonist teeth, implant surface texture, presence of splinting or non-splinting, and location of missing teeth. Statistical analysis was performed using binary logistic regression analysis. The marginal bone loss rate was 13.0% from subject-based data. There was no significant difference in bone loss rate with marginal bone level or location of missing teeth, whereas surface texture, dental antagonist, status of remaining teeth, and prostheses splinting affected bone loss rates.
