Department of Endodontics, Guiyang Hospital of Stomatology, Guiyang, 550002, Guizhou, China.
Zunyi Medical University, Zunyi, 563000, Guizhou, China.
BMC Med Imaging. 2022 May 29;22(1):104. doi: 10.1186/s12880-022-00831-4.
The aim of this study was to evaluate the prevalence and characteristics of C-shaped root canals in maxillary first (MFMs) and second (MSMs) molars in a Southwestern Chinese population using cone-beam computed tomographic (CBCT).
CBCT images of MFMs (n = 1488) and MSMs (n = 1547) from 1508 subjects enrolled in Guiyang Hospital of Stomatology between July 2018 to February 2021 were evaluated for the incidence and types of C-shaped root canals. Differences by age, sex, left or right side, and bilateral symmetry were also evaluated.
C-shaped root canals were present in 2.93% MFMs and MSMs (n = 3035) in the Southwestern Chinese population. A significant higher incidence was observed in the MSMs (5.24%) than in the MFMs (0.54%). Increased incidences were noted in teeth with fused root. Two major types and 5 subtypes of C-shaped canal system of maxillary molars were defined, and the most common type of C-shaped canals is fusion of mesial-buccal (MB) and distal-buccal (DB) canals (Type I subtype C). No significant gender and age differences were noted in the prevalence of C-shaped root canals in this population, and no significant difference was seen in its incidence in the left or right MFMs and MSMs. The bilateral occurrence was observed in 1.27% of the patients.
C-shaped root canals are more frequently present in MSMs than in MFMs in the Southwestern Chinese population, with Type I subtype C (MB-DB canal fusion) as the most common subtype and low incidence of bilateral symmetry.
本研究旨在使用锥形束计算机断层扫描（CBCT）评估中国西南部人群上颌第一（MFMs）和第二磨牙（MSMs）中 C 形根管的发生率和特征。
对 2018 年 7 月至 2021 年 2 月期间贵阳口腔医院 1508 名患者的 MFMs（n=1488）和 MSMs（n=1547）的 CBCT 图像进行评估，以确定 C 形根管的发生率和类型。还评估了年龄、性别、左侧或右侧以及双侧对称性的差异。
在中国西南部人群中，MFMs 和 MSMs 中 C 形根管的发生率为 2.93%（n=3035）。MSMs（5.24%）的发生率明显高于 MFMs（0.54%）。融合根的牙齿发生率增加。确定了上颌磨牙 C 形根管系统的两种主要类型和 5 种亚型，最常见的 C 形根管类型是近颊-远颊（MB-DB）根管融合（I 型 C 型）。在该人群中，C 形根管的发生率在性别和年龄方面无显著差异，MFMs 和 MSMs 的左侧或右侧也无显著差异。在 1.27%的患者中观察到双侧发生。
在中国西南部人群中，MSMs 中 C 形根管比 MFMs 更常见，最常见的亚型为 I 型 C 型（MB-DB 根管融合），双侧对称性发生率较低。
