11岁儿童第三磨牙与第二磨牙、尖牙的发育相关性研究

摘要

Objective To analyze the imaging manifestations of third molar CM3) in aged 11, and to explore the relationship of development between M3 and second molar (M2), canine (C). Methods A total of 399 cases, aged 11, of West China School of Stomatology in June August 2010 were selected as the imaging database. The M3, M2, C on the panoramic images were observed and the development degree in 399 was divided. And then the correlation analysis was done. Results 45.5% of M3 in aged 11 was in stage G. 30.8% of M2 was in stage F. 36.1% of C was in stage G. The development of M3 appeared earlier in girls than in boys, and earlier in the mandible than in the maxil-lary. There was no significant difference between the left and right side. The correlation coefficient between M3 and M2 was 0.437, and the correlation coefficient between M3 and C was 0.132. Conclusion The general trends of the developments of M3 and M2, C were the same. The development of M3 can be used to describe the development of M2 and C, according to the close relationship in radiograph.%目的 调查分析11岁儿童第三磨牙(M3)的影像学表现,探讨M3发育情况与其相应第二磨牙(M2)、尖牙(C)生长发育的关系.方法 从四川大学华西口腔医院影像资料库中随机抽取2010年6-8月期间拍摄的11岁儿童全颌曲面断层片共399张,分别观察M3、M2、C的发育情况并进行发育分期,然后分析三者相关性.结果 在11岁儿童中,M3处于发育C期的比例为45.5％,M2处于F期的比例为30.8％,C处于G期的比例为36.1％.女性M3较男性发育早；下颌M3较上颌发育早；左右侧M3发育无明显差异.M3与M2、C的相关系数分别为0.437、0.132.结论 M3与M2、C发育总体趋势具有一致性,临床上可通过M2、C的发育状况来了解M3发育状况.