Department of Operative Dentistry and Endodontics, Faculty of Dentistry, Mahidol University, Bangkok, Thailand.
Department of Operative Dentistry and Endodontics, Faculty of Dentistry, Mahidol University, Bangkok, Thailand.
J Endod. 2018 Feb;44(2):233-238. doi: 10.1016/j.joen.2017.09.013. Epub 2017 Dec 6.
The aim of the present study was to compare the survival rates against fracture of premolar endodontically treated teeth (ETT) restored with resin composite or crowns and to identify risk factors associated with the fracture.
Data from dental records and radiographs of premolar ETT with postendodontic restorations (ie, resin composite or crowns) were collected between 2012 and 2016 and selected following selected inclusion and exclusion criteria. Tooth location, type of restoration, number of proximal contacts, and amount of tooth surface loss were recorded. The incidence and restorability of postendodontic fractures were identified. Survival rates against fracture of the 2 restoration types were calculated using Kaplan-Meier survival analysis. Any potential factors associated with fractures were identified using Cox proportional hazards models.
The survival rate against fracture of ETT restored with crowns (95.1%) was higher than resin composite (77.0%). ETT restored with resin composite with 1 or 2 tooth surface losses and 2 proximal contacts had a high survival rate of 88.5% that was not significantly different from ETT with crowns. A higher incidence of restorability after fracture was observed in teeth restored with resin composite than crowns. The type of restoration and number of proximal contacts were identified as potential risk factors associated with fracture incidence.
The survival rate against fracture of ETT restored with crowns was higher than resin composite. However, ETT with 1 or 2 tooth surface losses and 2 proximal contacts and restored with resin composite showed a high survival rate that was comparable with ETT restored with crowns.
本研究的目的是比较用树脂复合材料或牙冠修复的后牙（ETT）的存活率与骨折，并确定与骨折相关的风险因素。
收集了 2012 年至 2016 年间有后牙根管治疗后修复（即树脂复合材料或牙冠）的牙记录和射线照片的数据，并根据选择的纳入和排除标准进行了选择。记录了牙齿位置、修复类型、近中接触数和牙齿表面损失量。确定了后牙根管治疗后骨折的发生率和可修复性。使用 Kaplan-Meier 生存分析计算了两种修复类型的抗骨折存活率。使用 Cox 比例风险模型确定与骨折相关的任何潜在因素。
用牙冠修复的 ETT 的骨折存活率（95.1%）高于用树脂复合材料（77.0%）。用树脂复合材料修复的 1 或 2 个牙齿表面损失和 2 个近中接触的 ETT 具有 88.5%的高存活率，与用牙冠修复的 ETT 无显著差异。用树脂复合材料修复的牙齿比用牙冠修复的牙齿更容易发生骨折后可修复性。修复类型和近中接触数被确定为与骨折发生率相关的潜在风险因素。
用牙冠修复的 ETT 的骨折存活率高于用树脂复合材料。然而，用 1 或 2 个牙齿表面损失和 2 个近中接触并用树脂复合材料修复的 ETT 显示出与用牙冠修复的 ETT 相当的高存活率。
