Nanjing Stomatological Hospital, Affiliated Hospital of Medical School, Research Institute of Stomatology, Nanjing University, Nanjing, China.
The Affiliated Stomatological Hospital of Nanjing Medical University, Jiangsu Province Key Laboratory of Oral Diseases, Jiangsu Province Engineering Research Center of Stomatological Translational Medicine, Nanjing, China.
PeerJ. 2024 Jul 23;12:e17646. doi: 10.7717/peerj.17646. eCollection 2024.
With the increasing application of guided endodontics to treat complex root canal treatment, the entire process of root canal treatment has become more precise, reducing damage to tooth structure and improving success rates. However, due to the limitations of the operating space, the use of guided endodontic templates in posterior root canal treatment is less common. This study aims to compare the accuracy and reliability of selective laser melting (SLM) and traditional stereolithography etching (SLA) guided endodontic templates for posterior root canals, providing better treatment strategies for posterior root canal treatment.
The teeth were randomly assigned to either SLM or SLA group. Preoperative cone-beam computed tomography (CBCT) and a three-dimensional (3D) scanner were used to establish the 3D root canal system and the accurate occlusal models of the teeth. The virtual access to the canal access was designed using Mimics 19.0 and 3-Matic 11.0. The endodontic access was performed based on either SLM or SLA templates. The accuracy of endodontic preparation was measured in three-dimensions by calculating deviations from planned accesses. The template height and tooth substance loss rates in each group were measured.
SLM-guided templates have a low average deviation at the entry point and apical portion of the bur of total posterior teeth (including premolars and molars) and individual molars ( < 0.05). Moreover, there was a significant difference in angular deviations and height of template in total posterior teeth and individual molars ( < 0.05). The mean substance loss rate of the SLA group was slightly greater than that of the SLM group, but the difference was not statistically ( > 0.05).
SLM-guided endodontics provides a more predictable and precise location of root canal orifice for the treatment of posterior teeth.
随着引导牙髓学在治疗复杂根管治疗中的应用越来越广泛，根管治疗的整个过程变得更加精确，减少了对牙体结构的损伤，提高了成功率。然而，由于操作空间的限制，在后牙根管治疗中使用引导牙髓学模板的情况较少。本研究旨在比较选择性激光熔化（SLM）和传统立体光刻蚀刻（SLA）引导牙髓学模板在后牙根管治疗中的准确性和可靠性，为后牙根管治疗提供更好的治疗策略。
将牙齿随机分配到 SLM 或 SLA 组。术前使用锥形束计算机断层扫描（CBCT）和三维（3D）扫描仪建立 3D 根管系统和牙齿的精确咬合模型。使用 Mimics 19.0 和 3-Matic 11.0 设计虚拟根管入口。根据 SLM 或 SLA 模板进行牙髓进入。通过计算与计划进入点的偏差，从三维角度测量牙髓制备的准确性。测量每组模板高度和牙体物质损失率。
SLM 引导模板在总后牙（包括前磨牙和磨牙）和单个磨牙的入口点和根尖部的平均偏差较低（<0.05）。此外，总后牙和单个磨牙的角度偏差和模板高度有显著差异（<0.05）。SLA 组的平均物质损失率略高于 SLM 组，但差异无统计学意义（>0.05）。
SLM 引导牙髓学为后牙的根管口治疗提供了更可预测和精确的位置。
