OBJECTIVES The purpose of this study was to clinically investigate double-crown-retained removable partial dentures (DRPDs) and abutment teeth at dental clinics. MATERIALS AND METHODS Only cases with complete arch reconstruction were included. Endpoints were replacement of denture and loss of abutment tooth. A total of 213 dentures with 1030 abutment teeth were analyzed. RESULTS During the observation period, 32 dentures were replaced. The mean observation period was 12.7 (± 6.6) years (range 3 to 36). By the Kaplan-Meier method, survival rate at 10 years was 94.7% and at 20 years was 70.8%. Estimated mean survival period was 27.1 years. Cox regression analysis showed that risk factor for replacement was good occlusion as indicated by Eichner index groups A to B3 (HR 2.81). The main reason for denture replacement was loss of abutment teeth. Survival rate of abutment teeth at 10 years was 83.8% and at 20 years was 66.3%. The analysis revealed six risk factors: male gender (HR 1.76), age range 65-89 years (HR 1.51), posterior teeth (HR 1.60), higher number of present teeth in opposite jaw (HR 1.69), lower number of abutment teeth (HR 1.76), and short inner crown (HR 2.28). CONCLUSION DRPDs last over 20 years, making them a durable investment in one's oral health; their survival is influenced by loss of abutment teeth. CLINICAL RELEVANCE In cases where there are few teeth remaining in a jaw, DRPDs represent a suitable treatment that makes use of the remaining teeth, even if the abutment teeth are non-vital.

中文翻译：

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使用双冠完整牙弓重建的可摘局部义齿的成活率：一项回顾性研究。

目的本研究的目的是在牙科诊所临床研究双冠保留的可摘局部义齿（DRPD）和基牙。材料与方法仅包括完整牙弓重建的病例。终点是假牙的更换和基牙的丢失。分析了总共213个假牙和1030个基牙。结果在观察期内，更换了32个假牙。平均观察期为12.7（±6.6）年（范围3至36）。通过Kaplan-Meier方法，10年生存率为94.7％，20年生存率为70.8％。估计平均生存期为27.1年。Cox回归分析表明，如艾希纳指数A至B3组（HR 2.81）所示，置换的危险因素是良好的闭塞。进行义齿置换的主要原因是基牙缺失。10年时基牙的成活率为83.8％，而20年时为66.3％。分析显示六个风险因素：男性（HR 1.76），年龄在65-89岁之间（HR 1.51），后牙（HR 1.60），对侧颌中现存牙齿的数量较高（HR 1.69），基牙的数量较低（HR 1.76）和短内冠（HR 2.28）。结论DRPD可持续使用20多年，使它们成为对口腔健康的持久投资。它们的存活受到基牙损失的影响。临床相关性如果颌骨中只剩下很少的牙齿，即使基牙不重要，DRPDs仍是使用剩余牙齿的合适治疗方法。后牙（HR 1.60），对颌中存在的牙齿数量较多（HR 1.69），基牙数量较少（HR 1.76）和内冠短（HR 2.28）。结论DRPD可持续使用20多年，使它们成为对口腔健康的持久投资。它们的存活受到基牙损失的影响。临床相关性如果颌骨中只剩下很少的牙齿，即使基牙不重要，DRPDs仍是使用剩余牙齿的合适治疗方法。后牙（HR 1.60），对颌中存在的牙齿数量较多（HR 1.69），基牙数量较少（HR 1.76）和内冠短（HR 2.28）。结论DRPD可持续使用20多年，使它们成为对口腔健康的持久投资。它们的存活受到基牙损失的影响。临床相关性如果颌骨中只剩下很少的牙齿，即使基牙不重要，DRPDs仍是使用剩余牙齿的合适治疗方法。