下颌第三磨牙根管系统解剖形态的显微CT观测

摘要

目的:掌握下颌第三磨牙根管系统的解剖形态.方法:从临床收集拔除的下颌第三磨牙76个.显微CT扫描后Mimics 17.0软件进行三维重建,从不同视角观察根管系统的解剖形态,统计分析髓角、根管、侧副根管的发生情况.结果:76个下颌第三磨牙中,融合性单根管系统22例(28.9％),其中C形根管18例;近、远中双根管系统52例(68.4％);76例中,近中根管1-1型35例,远中根管1-1型49例;3根型磨牙2例(2.6％).侧副根管的发生率为60.5％ (46/76).结论:下颌第三磨牙根管系统的解剖变异类型虽多,但多数情况下根管分化程度低.%AIM:To investigate the root canal anatomy of the madibular third molars.METHODS:76 madibular third molars were collected fromthe dental clinics.The teeth were scanned by a micro-CT scanner.After 3D reconstruction by Mimics 17.0 software,the tooth anatomy was examined in different views.The occurrence pattern of the pulp horns,different types of the canals and accessory canals were analyzed.RESULTS:Among the 76 third molars,22 teeth had a single root canal system (28.9％) and 18 had a C-shaped canal;52 molars (68.4％) had both a mesial and a distal separated root canal system,and they frequently had a simple type 1-1 canal (35 cases for the mesial,and 49 for the distal canal system);three-rooted forms were observed in 2 molars (2.6％).The frequency of accessory canals was 60.5％ (46/76).CONCLUSION:The root canal system of the madibular third molars may exhibit many variation forms.Whereas in most cases,the degree of the canal differentiation is at a low level.