Chungchatupornchai Sirintra, Arayasantiparb Raweewan, Jirathanyanatt Titalee
Department of Operative Dentistry and Endodontics, Faculty of Dentistry, Mahidol University, 6 Yothi St., Rajthevi, Payathai, Bangkok, 10400, Thailand.
Department of Oral and Maxillofacial Radiology, Faculty of Dentistry, Mahidol University, 6 Yothi St., Rajthevi, Payathai, Bangkok, 10400, Thailand.
BMC Oral Health. 2025 Apr 28;25(1):650. doi: 10.1186/s12903-025-06018-x.
To investigate the prevalence and morphological characteristics of distolingual roots in permanent mandibular molars among a Thai population using a cone-beam computed tomography (CBCT).
This retrospective study consisted of two parts: prevalence and morphology study. A total of 5228 permanent mandibular first and second molars from 2623 Thai patients were included in the prevalence study, and CBCT images were analyzed to identify the presence of distolingual roots. Additionally, 288 teeth with distolingual roots were subjected to further analysis to assess their root morphology, canal configuration, and orifice location. Statistical analyses were performed using descriptive statistics, Pearson's chi-square test, paired t-test, and other appropriate methods.
The prevalence of distolingual roots in permanent mandibular molars was 9.14% among the examined teeth and 14.94% among the examined patients. The majority of distolingual roots were classified as type C according to Carlsen and Alexandersen's classification, and type III according to Song's classification. Additionally, the vast majority of teeth exhibited Vertucci type I canal configuration. Further analysis revealed that the mean interorifice distances between DB-DL, ML-DL, and MB-ML orifices were 3.01 ± 0.6 mm, 3.43 ± 0.57 mm, and 2.61 ± 0.59 mm, respectively. The angle and radius of curvature of distolingual roots in the proximal view were greater than those in the clinical view (p < 0.001).
This study provides comprehensive insights into the prevalence and morphological characteristics of distolingual roots in permanent mandibular molars among a Thai population. These findings emphasize the importance of thorough preoperative assessment and awareness of root morphology variations to enhance the success of endodontic treatment.
使用锥形束计算机断层扫描（CBCT）研究泰国人群中恒下颌磨牙远中舌侧根的患病率及形态特征。
这项回顾性研究包括两个部分：患病率研究和形态学研究。患病率研究纳入了2623名泰国患者的5228颗恒下颌第一和第二磨牙，分析CBCT图像以确定远中舌侧根的存在情况。此外，对288颗有远中舌侧根的牙齿进行进一步分析，以评估其牙根形态、根管形态和根管口位置。使用描述性统计、Pearson卡方检验、配对t检验及其他适当方法进行统计分析。
在所检查的牙齿中，恒下颌磨牙远中舌侧根的患病率为9.14%，在所检查的患者中为14.94%。根据卡尔森和亚历山德森的分类，大多数远中舌侧根被归类为C型，根据宋的分类为III型。此外，绝大多数牙齿表现为韦尔图奇I型根管形态。进一步分析显示，DB-DL、ML-DL和MB-ML根管口之间的平均孔间距离分别为3.01±0.6毫米、3.43±0.57毫米和2.61±0.59毫米。远中舌侧根在近中视图中的角度和曲率半径大于临床视图中的角度和曲率半径（p<0.001）。
本研究全面深入地了解了泰国人群中恒下颌磨牙远中舌侧根的患病率及形态特征。这些发现强调了术前全面评估以及了解牙根形态变异对于提高牙髓治疗成功率的重要性。
