下颌第三磨牙根管系统解剖形态的显微CT观测

Micro-CT analysis of the morphology of root canal systems of the mandibular third molars

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 from the dental clinics. The teeth were scanned by a micro-CT scanner. After3 D 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.