Kim S Y, Kim B S, Kim Y
Department of Conservative Dentistry, Seoul St. Mary's Dental Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.
Department of Radiology, Ewha Womans University School of Medicine, Seoul, Korea.
Int Endod J. 2016 Feb;49(2):136-44. doi: 10.1111/iej.12437. Epub 2015 Mar 11.
To determine the root canal anatomy of mandibular second molars in a Korean population by analysing cone-beam computed tomography (CBCT) images.
The CBCT images of 960 subjects were examined. The number and configuration of roots and canals were categorized according to Vertucci's and modified Melton's classifications.
Of the 1920 mandibular second molars, 41% had one root, 58% had two roots, and <1% had three roots. In the mesial roots of two-rooted molars, Vertucci's Type lV (44%) and Type II (37.75%) canals were most frequent. The prevalence of C-shaped roots was 40%, and C-shaped roots in combination with additional mesiolingual or distolingual roots were found in <1% of molars. Interestingly, O-shaped canals were detected in 0.10% of the molars. Of the C-shaped roots, the most common configuration types were Melton's Type I (66%) in the coronal region and Melton's Type III (56%) in the apical region. The prevalence of C-shaped roots was higher in females (47%) than in males (32%) (P < 0.001) and did not differ with age (P = 0.497) or tooth position (P = 0.514). Most (82%) C-shaped canals were bilateral (P < 0.001).
A high prevalence of C-shaped canals and a low incidence of three-rooted molars were observed in the mandibular second molars of the Korean subpopulation studied.
通过分析锥形束计算机断层扫描（CBCT）图像，确定韩国人群下颌第二磨牙的根管解剖结构。
检查了960名受试者的CBCT图像。根据韦尔图奇分类法和改良的梅尔顿分类法对牙根和根管的数量及形态进行分类。
在1920颗下颌第二磨牙中，41%为单根，58%为双根，<1%为三根。在双根磨牙的近中根中，韦尔图奇IV型（44%）和II型（37.75%）根管最为常见。C形根的发生率为40%，<1%的磨牙存在C形根合并额外近中舌侧或远中舌侧根的情况。有趣的是，在0.10%的磨牙中检测到O形根管。在C形根中，最常见的形态类型在冠部为梅尔顿I型（66%），在根尖部为梅尔顿III型（56%）。C形根在女性中的发生率（47%）高于男性（32%）（P<0.001），且与年龄（P=0.497）或牙位（P=0.514）无关。大多数（82%）C形根管为双侧（P<0.001）。
在所研究的韩国亚人群下颌第二磨牙中，观察到C形根管的高发生率和三根磨牙的低发生率。
