Morphometric study of the apical anatomy of C-shaped root canal systems in mandibular second molars
Morphometric study of the apical anatomy of C-shaped root canal systems in mandibular second molars
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下颌第二磨牙C形根管系统根尖解剖形态测量研究
DOI：
10.1111/j.1365-2591.2007.01193.x
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发表时间：
2007-04-01
影响因子：
5
通讯作者：
Fan, B.
中科院分区：
文献类型：
--
作者：
Cheung, G. S. P.;Yang, J.;Fan, B.
目的应用显微计算机断层扫描（mu CT）和体视显微镜观察下颌第二磨牙c形根管系统的根尖解剖。方法对44颗具有c型根管系统的中国人下颌恒磨牙进行CT扫描，扫描分辨率为30 × 30 μ m，扫描间隔为100 μ m，并对每颗牙的根尖5mm进行三维重建，根据Vertucci标准对根管结构进行可视化和分类。在体视显微镜下检查主孔和副孔。结果IV型和VIII型根管构型多见于根管系统的根尖5mm处。副管、外侧管、管间交通和根尖三角洲的患病率分别为41%、25%、27%和11%。约80%的c形管有1-3个顶孔；副孔的患病率约为48%。主孔与解剖根尖的平均距离为0.84 mm，副孔与解剖根尖的平均距离为1.61 mm。主孔和副孔的平均（最短和最长）直径分别为0.19 ~ 0.32 mm和0.07 ~ 0.10 mm，平均形状因子分别为0.73和0.82。结论下颌第二磨牙c型根管系统的根尖解剖结构极其复杂，具有多种解剖变异。
Aim To investigate the apical anatomy of C-shaped canal systems in mandibular second molars by micro-computerized tomography (mu CT) and stereomicroscopy.Methodology Forty-four permanent mandibular second molars with a C-shaped root canal systems from a native Chinese population were scanned at 100 mu m intervals by mu CT at a resolution of 30 x 30 mu m. The apical 5 mm of each tooth was reconstructed three-dimensionally for visualization and classification of the canal configuration using Vertucci's criteria. The main and auxiliary (accessory) foramina were examined under a stereomicroscope.Results Type IV and VIII canal configurations were most often found in the apical 5 mm of these canal systems. The prevalence of accessory canals, lateral canals, inter-canal communications and apical delta were 41%, 25%, 27% and 11%, respectively. Approximately 80% of C-shaped canals had 1-3 apical foramina; the prevalence of accessory foramina was about 48%. The mean distance between the main foramen and the anatomic root apex was 0.84 mm, and that between the accessory foramen and the apex was 1.61 mm. The mean (shortest and longest) diameters of major and accessory foramina were 0.19 similar to 0.32 mm and 0.07 similar to 0.10 mm, with a mean form factor of 0.73 and 0.82, respectively.Conclusion The apical anatomy of C-shaped root canal systems in mandibular second molars is extremely complex with many anatomical variations.