Yang Shuchun, Li Chenye, Shi Hui, Liu Ming, Wang Xu
Department of Prosthodontics, School and Hospital of Stomatology, Liaoning Provincial Key Laboratory of Oral Diseases, China Medical University, Shenyang, 110002, China.
Department of Stomatology, Tacheng Hospital of China Medical University, Tacheng, Xinjiang Uygur Autonomous Region, 834700, China.
BMC Oral Health. 2025 Aug 21;25(1):1347. doi: 10.1186/s12903-025-06727-3.
This study aimed to investigate variations in root and canal morphology of the mandibular second molars in a Chinese Kazakh population using cone-beam computed tomography (CBCT).
A total of 374 mandibular second molars from 236 patients were included in the retrospective study. The mandibular second molars were categorized based on the radiographic morphology of their external roots: non-fused roots (NFR), fused roots (FR), and single roots with a single canal (SS). The configuration of the C-shaped canal at three different levels was categorized into C1-C5. A chi-square test was employed to assess the association between the incidence of C-shaped root canals and demographic factors such as sex and tooth position.
Mandibular second molars typically had two roots. C-shaped root canals appeared in 33.1% of second molars. The C-shaped form was most prominent in C3, followed by C1. Sex and tooth position did not exhibit notable differences.
The incidence of C-shaped root canals in the Chinese Kazakh population was similar to that previously reported in Asian populations and higher than in Caucasian and Middle Eastern populations.
本研究旨在使用锥形束计算机断层扫描（CBCT）研究中国哈萨克族人群下颌第二磨牙的牙根和根管形态变异。
这项回顾性研究纳入了来自236例患者的374颗下颌第二磨牙。下颌第二磨牙根据其牙根外部的影像学形态进行分类：非融合根（NFR）、融合根（FR）和单根管单根（SS）。将C形根管在三个不同水平的形态分为C1 - C5。采用卡方检验评估C形根管发生率与性别和牙位等人口统计学因素之间的关联。
下颌第二磨牙通常有两个牙根。C形根管出现在33.1%的第二磨牙中。C形在C3中最为突出，其次是C1。性别和牙位未表现出显著差异。
中国哈萨克族人群中C形根管的发生率与先前在亚洲人群中报道的相似，高于白种人和中东人群。
