Clinical evaluation of fixed prosthetic restoration : Multivariate and survival analysis

本研究的目的是评估固定修复体的临床性能。选择树脂粘接固定局部义齿（rbfpd）和银-钯-铜-金合金树脂贴面修复体进行评价。关于rbfpd，临床评估了1987年至2002年期间使用硫酮引物作为金属调节剂（Metaltite或V-Primer）和粘接树脂（Super-Bond C&B）插入的81例rbfpd的保留情况。定义了两个生存水平：(1)完全生存（无脱粘）和(2)功能生存（包括原RBFPD重粘后一次保留的丧失）。所有数据均来自临床检查，并在最后可获得信息的日期对缺失数据进行审查。使用Kaplan-Meier程序确定平均生存期。在81个rbfpd中，5个修复失败，其中1个可以再粘合。观察时间为165个月，完全生存期为43.9%，功能生存期为178个月，功能生存期为87.7%。对于缺失牙/牙、缺失牙和基牙的位置和数量、基牙准备类型，这些因素对寿命的影响无统计学意义，但生存曲线有不同的趋势。在一年的评估期后，评估的树脂贴面修复体显示出临床成功。结果表明，含贵金属调节剂的树脂粘接系统对银-钯-铜-金合金修复体的修复寿命是可靠的。

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.