Clinical evaluation of fixed prosthetic restoration : Multivariate and survival analysis

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The purpose of this study was to evaluate the clinical performance of fixed prosthodontic restorations. The resin-bonded fixed partial dentures(RBFPDs)and resin veneer restorations made from a silver-palladium-copper-gold alloy were selected and assessed. Regarding RBFPDs, the retention of 81 RBFPDs inserted during the 1987 to 2002 using a thione primer as the metal conditioner(Metaltite or V-Primer)and an adhesive resin (Super-Bond C&B) was clinically evaluated. Two levels of survival were defined : (1)complete survival(no debonding) and (2)functional survival(including loss of retention on one occasion with rebonding of the original RBFPD). All data were obtained from clinical examinations, and missing data were censored at the date of the last available information. Mean survival periods were determined using the Kaplan-Meier procedure. Of the 81 RBFPDs, five restorations failed, one of which could be rebonded. The observation duration and corresponding survival ratio for complete survival were 165 months and 43.9%, and those for functional survival were 178 months and 87.7%, respectively. In relation to the missing tooth/teeth, the location and the number of missing teeth and abutment teeth, and the type of abutment preparation, these factors had no statistical affect on longevity, although the survival curves showed different tendencies. Regarding the resin veneer restorations assessed demonstrated clinical success after one-year evaluation period. The results indicate that resin bonding system including noble metal conditioner is clinically reliable for longevity, of fixed prosthodontic restorations made from a silver-palladium-copper-gold alloy.