摘要
目的 确定不同年龄组恒牙钙化的平均值和性别差异 ,以使牙龄能准确评估生理年龄。方法 选择 170 9例曲面体层片 ,分别记录每个恒牙的发育度分期值 ;计算男、女各年龄组恒牙发育度分期值的平均值及总值 ;绘出恒牙发育值 年龄关系曲线 ;计算每个恒牙牙冠及牙根发育完成时间。结果 得到 4～ 17岁年龄组恒牙发育度分期的平均值及各年龄组恒牙发育度分期总值及恒牙牙冠及牙根发育完成时间。牙冠发育完成女性比男性平均提前 0 3年 ,牙根发育完成女性较男性平均提前0 6年。结论 恒牙发育女性早于男性 。
Objective To study the development of permanent teeth by radiographic methods Me thods The permanent teeth development of children ranging from 4～17 years was evaluated from 1709 panoramic radiographs by the Nolla′s method Eac h tooth was graded from 0 to 10 stage The average developmental stage for girl s and boys were calculated Results The average developmental stage and development curves for girls and boys were obtained respectively For the completion of crown and root development, girls are more advanced than boys by an average of 03 and 06 years Conclusions Girls are ahead of boys for the development of the permanent teeth The norms of the maturation of permane nt teeth can be used to evaluated the development of the individual teeth
出处
《中华口腔医学杂志》
CAS
CSCD
北大核心
2001年第4期246-249,共4页
Chinese Journal of Stomatology
关键词
X线
诊断
恒牙
牙发育
Panoramic radiographs
Permanent teeth
Denta l development
