The State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) and Key Laboratory of Oral Biomedicine Ministry of Education, School and Hospital of Stomatology, Wuhan University, Wuhan, China.
Int Endod J. 2012 Nov;45(11):1035-41. doi: 10.1111/j.1365-2591.2012.02070.x. Epub 2012 Jun 14.
To investigate and compare the unique anatomical features and positioning of C-shaped canals in mandibular first premolars with and without radicular grooves in a Chinese population.
A total of 327 extracted mandibular first premolars including 146 with radicular grooves and 181 without radicular grooves from a Chinese population were scanned by μCT-50 or μCT-80. After reconstruction, canal systems were classified according to a modified Vertucci method and the anatomical features evaluated. The data were analysed by one-way anova test, Chi-square test and Fisher's exact test (P < 0.05).
Of 146 mandibular first premolars with a radicular groove, 97 had C-shaped canals, the predominant anatomical canal type being Vb (P < 0.001), which was characterized by an oval canal in the coronal part and a semicolon or continuous C-shape beneath the groove. Of the 181 mandibular first premolars without a radicular groove, no C-shaped canal system was observed, and the percentage of Ia (97.8%) was significantly higher than those of other types (P < 0.001).
In teeth from a Chinese population, mandibular first premolars with radicular grooves had a high incidence of C-shaped canal systems with anatomical variations along the root.
研究并比较中国人群中具有和不具有根分歧沟的下颌第一前磨牙的 C 型根管的独特解剖特征和定位。
共扫描了 327 颗来自中国人的下颌第一前磨牙，包括 146 颗具有根分歧沟和 181 颗没有根分歧沟的下颌第一前磨牙。使用 μCT-50 或 μCT-80 进行扫描后，根据改良的 Vertucci 方法对根管系统进行分类，并评估解剖特征。使用单因素方差分析、卡方检验和 Fisher 精确检验（P < 0.05）对数据进行分析。
在 146 颗具有根分歧沟的下颌第一前磨牙中，有 97 颗具有 C 型根管，主要的解剖根管类型为 Vb（P < 0.001），其特征是在冠部呈椭圆形根管，在沟下呈半开或连续的 C 形。在 181 颗没有根分歧沟的下颌第一前磨牙中，没有观察到 C 型根管系统，并且 Ia 型（97.8%）的比例显著高于其他类型（P < 0.001）。
在中国人群中，具有根分歧沟的下颌第一前磨牙 C 型根管系统的发生率较高，其解剖特征沿根发生变化。
