Department of Operative Dentistry and Endodontics, School of Dentistry, Tri-Service General Hospital and National Defense Medical Center, Taipei, Taiwan.
Department of Periodontology, School of Dentistry, Tri-Service General Hospital and National Defense Medical Center, Taipei, Taiwan.
J Endod. 2018 May;44(5):711-716.e1. doi: 10.1016/j.joen.2018.01.005. Epub 2018 Mar 1.
The aim of this study was to assess the prevalence of complicated root canals in permanent mandibular central incisors (PMCIs) and its correlation with the presence of a distolingual root (DLR) in permanent mandibular first molars (PMFMs) using cone-beam computed tomographic imaging in a Taiwanese population.
A total of 400 patients (800 pairs of PMCIs and PMFMs) were qualified for further analysis. The prevalence of DLRs in PMFMs along with root canal configurations of PMCIs were assessed at subject and tooth levels. Multivariable logistic regression analysis was used to evaluate the correlation between the root canal configurations of PMCIs with the existence of DLRs in PMFMs.
The prevalence of PMFMs with DLRs and complicated root canal configurations in PMCIs was 23.0% and 15.6%, respectively. A significant difference in age (<50 years vs ≥50 years) was found for complicated root canal configurations in PMCIs. The most prevalent root canal system in PMCIs was Vertucci type I (84.4%) followed by type III (13.5%). A positive correlation between the presence of DLRs in PMFMs and complicated root canal configurations in PMCIs was noted. After adjusting for categoric variables including sex, age, and side, the odds ratios for the occurrence of complicated root canal configurations of PMCIs in the unilateral DLR group and the bilateral DLR group compared with the non-DLR group were 2.13 and 2.53, respectively.
The concurrent appearance of DLRs in PMFMs and complicated root canal morphology in PMCIs is prominent in Taiwanese individuals.
本研究旨在通过锥形束计算机断层扫描成像评估台湾人群恒磨牙第一前磨牙（PMFMs）远中舌侧根（DLR）存在与恒中切牙（PMCIs）复杂根管之间的相关性。
共有 400 名患者（800 对 PMCIs 和 PMFMs）符合进一步分析的条件。在个体和牙齿水平评估 PMFMs 中 DLR 的存在以及 PMCIs 的根管配置。多变量逻辑回归分析用于评估 PMCIs 的根管配置与 PMFMs 中 DLR 存在之间的相关性。
具有 DLR 和 PMCIs 复杂根管配置的 PMFMs 的患病率分别为 23.0%和 15.6%。在 PMCIs 中，年龄（<50 岁与≥50 岁）存在显著差异。最常见的根管系统是 Vertucci Ⅰ型（84.4%），其次是Ⅲ型（13.5%）。PMFMs 中 DLR 的存在与 PMCIs 中复杂根管配置之间存在正相关。在调整了性别、年龄和侧别等分类变量后，单侧 DLR 组和双侧 DLR 组 PMCIs 中复杂根管配置的发生比值比（OR）与非 DLR 组相比分别为 2.13 和 2.53。
在台湾人群中，PMFMs 中 DLR 的同时出现和 PMCIs 中复杂的根管形态是突出的。
