上颌第三磨牙根管形态的显微研究

目的研究上颌第三磨牙根管的解剖形态并寻找牙根与根管之间的对应关系。方法从150颗患者被拔除的上颌第三磨牙中，筛选牙体较完整的融合根30颗和分叉根17颗，利用显微cT扫描后行三维重建，观察其根管全貌，并对根管类型进行统计分析。结果17颗分叉根的根管形态全部为3管型或4管型，其中15颗根管数目与牙根数目一致；30颗融合根则出现了多种根管形态，其根管数目为1～4个不等。结论上颌第三磨牙根管形态变异大，但分叉根的根管形态相对简单，而融合根的根管形态反而复杂，牙根和根管数目往往不一致。

Root canal morphology in maxillary third molars by micro-CT

Objective This study investigated the root canal morphology and determined the regularity between root and root canal in the maxillary third molar. Methods Among the 150 maxillary third molars extracted, 30 fused root teeth and 17 separated root teeth were selected for scanning from crown to apex by using micro-CT. Subsequently, a 3D visual model of teeth and their inner root canal system was reconstructed. The morphology of the root canal was observed and analyzed. Results All 17 separated root molars showed three or four canals. The number of canals in 15 of these molars was as many as that of the roots. Different types of root canals were observed in 30 fused root molars with numbers varying from 1 to 4. Conclusion Different root canal morphologies of the maxillary third molar were found. The root canals in the separated root were simple, whereas complex in those of the fused root. The number of fused root was not as many as that of the root canal.