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目的:研究左右离体上颌第一前磨牙牙体的对称性。方法:筛选40位正畸患者新近拔除的双侧年轻上颌第一前磨牙共80颗作为研究对象。使用电子游标卡尺分别对牙体全长、冠长、根长、牙冠、牙颈及根中1/2的宽和厚等10个数据进行测量,测量结果使用SPSS 16.0软件进行统计分析。结果:所有40位患者左右上颌第一前磨牙在牙体外部形态上无统计学差异(P>0.05)。结论:左右上颌第一前磨牙牙体外部形态存在一定的对称性,变异较小。
Objective: To study the symmetry of the left and right maxillary first premolar teeth. Methods: A total of 80 newly diagnosed bilateral maxillary first premolars from 40 orthodontic patients were screened out. Elliptical calipers were used to measure the total length, crown length, root length, crown, width and thickness of 1/2 in the cervical and root, respectively. The results were analyzed by SPSS 16.0 software. Results: There was no significant difference in the external appearance of maxillary first premolar in all 40 patients (P> 0.05). Conclusion: There is a certain symmetry in the external morphology of the maxillary first premolar teeth with small variation.