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

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。

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

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.