【摘要】 目的探讨成都地区成人上颌第一前磨牙的解剖外形及其根管的形态特点,为牙体牙髓病的临床治疗提供理论依据。方法游标卡尺测量105颗上颌第一前磨牙的牙体各项长度指标;肉眼观察牙根形态;拍摄X线片,观察根管形态及类型。结果牙体各项指标测量值均呈正态分布,根长和牙长差异较大。冠长-牙长及根长-牙长间存在相关性及直线回归关系,其他指标间也广泛存在。上颌第一前磨牙单根或融合根居多,占74.3%。根管数目1～3,以两根管(68.5%)居多,主要有Ⅰ型、Ⅱ型、Ⅳ型和Ⅴ型。结论本实验结果可为成都地区成人上颌第一前磨牙的临床治疗提供理论参考。上颌第一前磨牙多根管率较高(71.4%),应该引起临床医生的高度重视。更多还原

【Abstract】 Objective To investigate the morphology and the root canal system of the maxillary first premolars, and to provide reference for the endodontic treatment. Methods Vernier was used to measure the length indexes. Macrography was used to observe the morphology of the root. X-ray technique was used to investigate the root canal systems. Results All indexes′ measurements assumed a normal distribution, in which root length and tooth length were more variable. Correlation and linear regression were significant about the crown length-tooth length and root length-tooth length and also generally existed among other indexes. 74.3% of 105 maxillary first premolars had fused or conical roots. Most teeth had two canals(68.5%), in which the main types were typeⅠ, typeⅡ, type Ⅳ and type Ⅴ. Conclusion The method may be applied for the root canal treatment of the maxillary first premolars in Chengdu, and the teeth have a high ratio of more than one root canal(71.4%), which should be paid attention to.更多还原