广东汉族青少年上颌第一前磨牙冠根测量值的相关性分析

Morphological analysis of maxillary first premolars among the Han nationality adolescent population in Guangdong

目的:探讨广东地区12～18岁汉族青少年上颌第一前磨牙的冠根值,并分析测量值的相关性。方法:正畸需要拔除的广东地区汉族青少年上颌第一前磨牙男女各100个,参照王惠芸的研究方法,确定测量指标,采用游标卡尺测量牙齿的全长、冠长、根长、冠、颈和根1/2的近中远中径和颊舌径,并对冠根各测量值进行直线相关和回归分析。结果:冠长、颈近中远中径、颈颊舌径、根1/2近中远中径、根1/2颊舌径的测量值男性大于女性(P﹤0.05)。牙齿全长和冠长、根长呈显著正相关,根长和全长的相关系数大于冠长和全长的相关系数;冠长与根长显著负相关;冠近中远中径、颈近中远中径、根1/2近中远中径相互呈正相关(P﹤0.05);冠颊舌径与颈颊舌径、根1/2颊舌径相互呈显著正相关(P﹤0.05)。长度、近中远中径、颊舌径3类中存在回归关系。结论:冠根各测量值间存在相关关系,可用牙冠测量值预测牙颈部和牙根中的相关值。

AIM：To study the external morphology of maxillary first premolars among the Han nationality adolescents＇ population in Guangdong province.METHODS：Two hundred extracted maxillary first premolars for orthodontic reasons from the Han adolescence were used in this study.The length of span,crown and root was measured.Mesial-distal width and buccal-lingual thickness of crown,cervic and root middle point were measured by a sliding caliper.Gender difference,linear correlation and linear regression of the measurements were analyzed.RESULTS： The values of crown length,mesial-distal width and buccal-lingual thickness of cervical and root middle point were larger in male than in female.There was significant correlation between crown/root length and span,mesial-distal width and buccal-lingual thickness of crown and that of cervical and root middle point.The ratio between root length and tooth length was greater than that between crown length and tooth length.CONCLUSION：A linear correlation may exist in the measured morphological values of crown and root.The crown measurement values may be used for predicting the values of the root.