Stomatological Hospital of Southern Medical University, Guangzhou, People's Republic of China.
School of Stomatology, Southern Medical University, Guangzhou, People's Republic of China.
BMC Oral Health. 2022 Apr 16;22(1):130. doi: 10.1186/s12903-022-02078-5.
Cone-beam computed tomography (CBCT) was used to study the root canal system of mandibular anteriors (MAs) in a Cantonese population and to evaluate the correlation between the complicated root canal configurations of mandibular lateral incisors (MLIs) and the presence of distolingual roots (DLRs) in mandibular first molars (MFMs).
A total of 11,376 mandibular anterior teeth were scanned by CBCT. Those whose images met the inclusion criteria were first analysed according to Vertucci's root canal configuration and then grouped based on gender, age, and side, and their effects on root canal morphology were analysed. Finally, statistical analysis was used to evaluate the correlation between the complicated root canal configurations of MLIs and the existence of DLRs in MFMs. All statistical analyses were performed by using SPSS 25.0 software. Quantitative data are presented as the mean ± standard deviation. Student's t tests were used to calculate statistical significance. P < 0.05 was considered statistically significant.
In MAs in the Cantonese population, all mandibular central incisors (MCIs) and MLIs had one root, and 0.37% of mandibular canines (MCs) had two roots. The most common Vertucci's root canal configuration was Vertucci I followed by Vertucci III. A total of 30.91% of MLIs and approximately 8% of MCIs and MCs have complicated root canal configurations. There were no significant differences in the prevalence of DLRs in MFMs and the incidence of complicated root canal configurations of MLIs between males and females or between the right and left teeth. However, a significant difference was found in different age groups of root canal configurations in MLIs. Moreover, significant ipsilateral and contralateral correlations between MFMs with DLRs and MLIs with complicated root canal configurations were observed on both sides.
In Cantonese population, the possibility of complicated root canal configuration in MLIs was higher, when DLR appeared in MFMs.
本研究采用锥形束 CT（CBCT）对广东人群下颌前牙根管系统进行研究，评估下颌侧切牙（MLI）复杂根管形态与下颌第一磨牙（MFM）远中舌侧根（DLR）的关系。
对 11376 颗下颌前牙进行 CBCT 扫描，符合纳入标准的图像先按 Vertucci 根管形态分型，再按性别、年龄、左右侧分组，分析其对根管形态的影响，最后采用 SPSS 25.0 软件进行统计分析，评价 MLI 复杂根管形态与 MFM 存在 DLR 的关系。计量资料用均数±标准差表示，组间比较采用 Student's t 检验，以 P<0.05 为差异有统计学意义。
广东人群下颌中切牙和侧切牙均为单根，下颌尖牙有 0.37%为双根，下颌前牙中以Vertucci Ⅰ型根管形态最常见，其次为 Vertucci Ⅲ型。下颌侧切牙复杂根管形态占 30.91%，下颌中切牙和尖牙分别有 8%和 3%出现复杂根管形态。下颌第一磨牙双侧远中舌侧根的发生率及 MLI 出现复杂根管形态的发生率在性别、左右侧间差异均无统计学意义，但在不同年龄组间差异有统计学意义。而且，下颌第一磨牙双侧远中舌侧根与同侧下颌侧切牙出现复杂根管形态之间存在同侧和对侧的显著相关性。
在广东人群中，当 MFM 出现 DLR 时，MLI 发生复杂根管形态的可能性更高。
