Department of Endodontics, School of Dentistry, Ardabil University of Medical Science, Ardabil, Iran.
Department of Endodontics, School of Dentistry, Tabriz University of Medical Science, Tabriz, Iran.
Scanning. 2023 Oct 3;2023:5628707. doi: 10.1155/2023/5628707. eCollection 2023.
The complex anatomy of C-shaped canals poses challenges for clinicians compared to teeth with normal root canal anatomy. This study is aimed at evaluating the frequency and morphology of C-shaped canals in the mandibular first and second molars among an Iranian population using cone-beam computed tomography (CBCT).
This cross-sectional study evaluated 369 CBCT scans from the archives of a radiology clinic in Ardabil, Iran. The sample included 248 mandibular first molars and 478 mandibular second molars. The presence of C-shaped canals and their classification, according to Fan et al., were evaluated at four levels: orifice, coronal, middle, and apical. Prevalence based on gender and tooth type was also assessed.
A total of 199 (53.9%) males and 170 (46.1%) females were evaluated. C-shaped canals were found in 11 (8 males/3 females) out of 248 (4.4%) first molars and in 20 (11 males/9 females) out of 478 (3.7%) second molars. The C2 configuration was most prevalent in the orifice, coronal, and middle levels of both molar types, while C3 and C4 morphologies were most commonly found apically in the second and first molars, respectively. A significant difference in configuration was found only at the coronal level between molar types. A significant association between gender and configuration was observed only at the orifice level of the second molars. No other significant differences were found ( > 0.05).
C-shaped canal configurations should be expected in 4.4% of mandibular first molars and 3.7% of the second molars in this Iranian population, with a predominance of the C2 configuration in the orifice, coronal, and middle levels.
与具有正常根管解剖结构的牙齿相比，C 形根管的复杂解剖结构给临床医生带来了挑战。本研究旨在通过锥形束计算机断层扫描（CBCT）评估伊朗人群下颌第一和第二磨牙中 C 形根管的频率和形态。
本横断面研究评估了伊朗阿尔达比勒一家放射科诊所档案中的 369 份 CBCT 扫描。样本包括 248 颗下颌第一磨牙和 478 颗下颌第二磨牙。根据 Fan 等人的分类，评估了 C 形根管的存在及其分类，分为口、冠、中、根尖四个水平。还评估了基于性别和牙齿类型的患病率。
共评估了 199 名（53.9%）男性和 170 名（46.1%）女性。在 248 颗（4.4%）第一磨牙中发现了 11 颗（8 名男性/3 名女性）C 形根管，在 478 颗（3.7%）第二磨牙中发现了 20 颗（11 名男性/9 名女性）。C2 构型在两种磨牙类型的口、冠和中部最为常见，而 C3 和 C4 形态在第二和第一磨牙中分别最常见于根尖。在磨牙类型之间，仅在冠部水平发现构型存在显著差异。仅在第二磨牙的口部水平观察到性别与构型之间存在显著关联。未发现其他显著差异（>0.05）。
在该伊朗人群中，预计 4.4%的下颌第一磨牙和 3.7%的第二磨牙会出现 C 形根管构型，其中 C2 构型在口、冠和中部最为常见。
