Few studies have examined the longevity of endodontically treated teeth in nonacademic clinical settings where most of the population receives its care. This study aimed to quantify the longevity of teeth treated endodontically in general dentistry practices and test the hypothesis that longevity significantly differed by the patient’s age, gender, dental insurance, geographic region, and placement of a crown and/or other restoration soon after root canal treatment (RCT). This retrospective study used deidentified data of patients who underwent RCT of permanent teeth through October 2015 in 99 general dentistry practices in the National Dental Practice-Based Research Network (Network). The data set included 46,702 patients and 71,283 RCT permanent teeth. The Kaplan–Meier (product limit) estimator was performed to estimate survival rate after the first RCT performed on a specific tooth. The Cox proportional hazards model was done to account for patient- and tooth-specific covariates. The overall median survival time was 11.1 y; 26% of RCT teeth survived beyond 20 y. Tooth type, presence of dental insurance any time during dental care, placement of crown and/or receiving a filling soon after RCT, and Network region were significant predictors of survival time (P < 0.0001). Gender and age were not statistically significant predictors in univariable analysis, but in multivariable analyses, gender was significant after accounting for other variables. This study of Network practices geographically distributed across the United States observed shorter longevity of endodontically treated permanent teeth than in previous community-based studies. Also, having a crown placed following an RCT was associated with 5.3 y longer median survival time. Teeth that received a filling soon after the RCT before the crown was placed had a median survival time of 20.1 y compared to RCT teeth with only a crown (11.4 y), only a filling (11.2 y), or no filling and no crown (6.5 y).

中文翻译：

---

国家牙科 PBRN 实践中的根管治疗生存分析

很少有研究在大多数人接受牙髓治疗的非学术临床环境中检查经过牙髓治疗的牙齿的寿命。本研究旨在量化一般牙科实践中接受牙髓治疗的牙齿的寿命，并检验以下假设：寿命因患者的年龄、性别、牙科保险、地理区域以及根管治疗后不久放置牙冠和/或其他修复体而显着不同。治疗（随机对照试验）。这项回顾性研究使用了截至 2015 年 10 月在国家牙科实践研究网络 (Network) 的 99 个普通牙科诊所中接受恒牙 RCT 的患者的去识别数据。该数据集包括 46,702 名患者和 71,283 颗 RCT 恒牙。Kaplan-Meier（产品极限）估计器用于估计对特定牙齿进行第一次 RCT 后的存活率。Cox 比例风险模型是为了考虑患者和牙齿特定的协变量。总体中位生存时间为 11.1 年；26% 的 RCT 牙齿存活超过 20 年。牙齿类型、牙科护理期间任何时候是否有牙科保险、RCT 后不久放置牙冠和/或接受填充物以及网络区域是生存时间的显着预测因素 ( P < 0.0001 )。在单变量分析中，性别和年龄不是统计上显着的预测因素，但在多变量分析中，在考虑其他变量后，性别是显着的。这项针对美国各地地理分布的网络实践的研究发现，经过牙髓治疗的恒牙的寿命比之前基于社区的研究要短。此外，随机对照试验后安装牙冠可使中位生存时间延长 5.3 年。在 RCT 后不久在放置牙冠之前接受填充的牙齿的中位生存时间为 20.1 年，相比之下，仅使用牙冠的 RCT 牙齿（11.4 年）、仅填充牙（11.2 年）或不填充牙冠的牙齿（11.2 年） 6.5 岁）。