上颌第二前磨牙根管颊舌向弯曲的研究

Root canal curvature of human maxillary second premolars in buccolingual directions

目的观察人上颌第二前磨牙根管的颊舌向弯曲情况和程度。方法随机选择152颗离体的上颌第二前磨牙,拍摄近远中向的X线片,使用Photoshop 7.0软件分析根管,用Weine法测量根管的弯曲度,测量的角度大于18°时,则认为根管存在明显的弯曲,根管的构型采用Vertucci分类法。结果16%的上颌第二前磨牙在颊舌向存在明显的根管弯曲;单根管的牙齿无明显的颊舌向根管弯曲;大多数的颊舌向根管弯曲发生于双根双管的牙齿;36%的双根牙齿有根管弯曲;根管弯曲的发生部位多为牙根的近根尖部分。结论上颌第二前磨牙根管的颊舌向弯曲发生率为16%;多在根尖近1/3出现1个弯曲。

Objective To determine the frequency and degree of root canal curvature of human maxillary second premolars in buccolingual directions. Methods 152 extracted maxillary second premolars were involved in the study. Radiograph of teeth in mesiodistal direction was taken. The canal curvature was calculated with Weine＇s method using Photoshop 7.0 by computer, and the root over 18 degrees was considered being curved. Root canals were classified according Vertucci＇s classification. Resuits 20 maxillary second premolars had curved root canals, and 36% of the teeth with two roots had curved root canals. Conclusion The total 16% of maxillary second premolars in buccolingual directions had curved root canals.