目的 观测一组汉族大学生人群上颌恒磨牙卡氏尖的表达情况.方法 根据美国亚利桑那州立大学牙齿人类学系统(Arizona State University Dental Anthropology System,ASUDAS)的卡氏尖分级标准,对803名汉族大学生的口内照和石膏模型进行观测和分析.卡氏尖出现率的性别和牙位差异采用卡方检验分析,表达强度的双侧相关性采用Kendall相关性检验分析.结果 卡氏尖的人群出现率在上颌第一、二恒磨牙分别为37.61％、3.99％,上颌第一恒磨牙显著高于上颌第二恒磨牙(P＜0.01);男性上颌第一、二恒磨牙卡氏尖的出现率分别为46.73％、6.30％,女性上颌第一、二恒磨牙卡氏尖的出现率分别为27.95％、1.54％,男性显著高于女性(P＜0.01);阳性表达以低强度表达(1～4级)为主,在上颌第一、二恒磨牙中分别占比67.37％和59.52％;卡氏尖的表达在上颌第一、二恒磨牙均具有一定的双侧相关性(tau-b=0.756,P＜0.01;tau-b=0.477,P＜0.01).结论 卡氏尖在该组汉族人群中主要发生于上颌第一恒磨牙,以低强度表达为主,掌握我国人群中卡氏尖的表达情况有重要的人类学和临床指导意义.
Abstract
Objective To investigate the Carabelli's traits on permanent maxillary molars in Han Chinese college students.Methods Intraoral photos and plaster models from 803 Han Chinese college students were observed and the Carabelli's traits on permanent maxillary molars were categorized by the Arizona State University Dental Anthropology System.Chi-square tests were performed for the comparison of the differences between male and female,permanent maxillary first and second molars.Kendall's tau-b correlation analy-ses were performed for the correlation between bilateral antimeric molars.Results The frequencies of Carabelli's traits on permanent maxillary first and second molars were 37.61％and 3.99％respectively,46.73％and 6.30％in males,27.95％and 1.54％in females,which were statistically significant between permanent maxillary first and second molars(P＜0.01),male and female(P＜0.01).In the positive expression,the low-grade expression(ASUDAS 1-4)was predominant and accounted for 67.37％and 59.52％on the perma-nent maxillary first and second molars.The correlation between bilateral antimeric teeth were statistically significant on permanent max-illary first molars(tau-b=0.756,P＜0.01)and second molars(tau-b=0.477,P＜0.01).Conclusion The Carabelli's traits on perma-nent maxillary molars in Han Chinese college students mostly occur on permanent maxillary first molars with low-grade expression,and understanding this has great anthropological and clinical significance.
关键词
卡氏尖/卡氏特征/牙齿非测量特征/牙齿人类学/牙体解剖
Key words
cusp of Carabelli/Carabelli's trait/dental non-metric trait/dental anthropology/dental anatomy
维普
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