带根面沟下颌第一前磨牙V型根管形态的Micro-CT研究

Investigation on the root canal configuration of the mandibular first premolars with radicular groove by micro-computer tomography

目的:使用Micro-CT技术研究离体带根面沟下颌第一前磨牙V型根管系统形态。方法:收集58颗带根面沟下颌第一前磨牙,运用Micro-CT扫描后三维重建牙齿及根管系统形态,观测根管类型、Vertucci V型根管分叉位置及角度,统计侧副根管发生率及位置;并对颊、舌根管根尖孔位置、管壁厚度及根管直径进行比较分析。结果:带根面沟下颌第一前磨牙根管最常见的类型为Vertucci V型,发生率为55.2%,有1例罕见4根管类型:1-3-4-3型;分叉至釉质牙骨质界距离为(6.13±2.08)mm,其舌侧根管偏离主根管角度为29.89°±11.22°;V型根管颊舌两根管在根尖孔位置、管壁厚度及根管直径方面均有统计学差异(P<0.05)。结论:带根面沟下颌第一前磨牙根管系统解剖形态复杂,V型根管发生率较高,了解其根管解剖特点,可为临床牙体治疗和修复提供参考。

Objective：To investigate the root anatomy and canal configuration of the mandibular first premolars with radicular groove in root surface by micro-computer tomography（Micro-CT）. Methods：In total of 58 mandibular first premolars with radicular groove were selected. The 3-dimensional images of the teeth and canal system morphology were reconstructed by Micro-CT. The types of canal configuration were classified,and the position and angle of Vertucci V root canal bifurcation were measured. The location and incidence of the accessory canals were recorded. The location of the apical foramen,the wall thickness and the diameter of the root canal were analyzed. Results：The most common type of root canal in mandibular first premolar with radicular groove was type V canal.In this study,cases of type V accounted for 55.2%. Root canal furcation of type V mandibular first premolar located about 6.13 mm below the cemento-enamel junction（CEJ）. Significant differences were found in the apical position,wall thickness and root canal diameter between the buccal and lingual canal. Conclusion：The root canal morphology of mandibular first premolars with radicular groove was complex,with a high incidence of type V canals. Understanding the anatomic features of the root canals provides greatly help in clinical treatment.