下颌第二恒磨牙C型根根管壁厚度的显微CT分析

发布时间：2018-05-23 06:55

本文选题：下颌第二恒磨牙 + C形根管　；参考：《实用口腔医学杂志》2014年02期

【摘要】：目的:测量下颌第二恒磨牙C型根的根管壁厚度。方法:采集到中国汉族患者拔除的C形根下颌第二恒磨牙40颗。显微CT扫描后采用Mimics 10.01软件进行三维重建;沿着牙体长轴从釉牙骨质界(CEJ)到根尖顶每隔1 mm连续虚拟横切牙根模型,观测牙根横截面上C形根管的类型(范兵分型),测量唇、舌侧以及近、远中参考位点的根管壁厚度。双因素方差分析及LSD-t检验比较不同方位的根管壁厚度。结果:40个下颌第二恒磨牙C形根被虚拟切割为370个根管横截面,其中C1根管126个(34.1%),C2根管46个(12.4%),C3根管160个(43.2%)。除了CEJ下10 mm水平,舌侧根管壁最小厚度均值总是小于颊侧,而两者又均小于近、远中参考位点处的根管壁厚度。除了CEJ下12 mm水平,4个测量位点根管壁厚度均值间的差异均有统计学意义(P0.05)。C2和C3根管的颊侧壁最小厚度在近中区最多见,C1根管颊、舌侧以及C2、C3根管的舌侧壁最小厚度多位于中央区。结论:下颌第二恒磨牙C型根管舌侧根管壁较薄,是根管及桩道预备的危险区。
[Abstract]:Objective: to measure the thickness of root canal wall of C type root of mandibular second permanent molar. Methods: forty C-shaped mandibular second permanent molars were extracted from Chinese Han patients. Three-dimensional reconstruction was performed by Mimics 10.01 software after microCT scanning, and a continuous virtual incised root model was established from the enamel bone boundary along the long axis of the tooth to the root tip at intervals of 1 mm. The types of C-shaped root canals on the cross section of the root were observed. The thickness of the root canal wall at the lingual side and near and distal reference sites. The thickness of root canal wall in different azimuth was compared by two factor ANOVA and LSD-t test. Results: C shaped root of 40 mandibular second permanent molars was cut into 370 root canal cross sections, among them, C 1 root canal 126 and C 2 root canal 46 and C 3 root canal 160. Except for the 10 mm level under CEJ, the mean minimum thickness of the lingual lateral root wall was always smaller than that of the buccal side, and both of them were less than the proximal, distal reference site. In addition to the 12 mm level under CEJ, there were statistically significant differences in the mean thickness of root canal wall between the four measuring sites. The minimum thickness of the buccal lateral wall of the root canal P0.05, C2 and C3 was the most common in the proximal middle region. The minimum thickness of the lateral wall of tongue and C _ 2 C _ 3 root canal is located in the central region. Conclusion: the lateral root canal wall of C type root canal of mandibular second permanent molar is thin, which is a dangerous area for root canal and post canal preparation.
【作者单位】：吴江区第一人民医院口腔科;西安交通大学机械学院机械制造系统工程国家重点实验室;
【分类号】：R816.98

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