CAJ | 학술논문

目的：通过数字化曲面断层片影像对上海地区青少年第三磨牙的发育状况进行研究，为口腔基础、临床应用和牙齿法医学的研究提供参考资料。方法采用改良的Demirjian分类法对1440名上海地区青少年所拍摄的数字化曲面断层片中第三磨牙进行分析，比较不同性别、不同部位之间的分布差异，总结上海地区青少年第三磨牙的发育状况。结果上海地区青少年在5岁时第三磨牙开始发育。女性第三磨牙18和28的出现频率明显高于男性( P <0．05)。结论上海地区青少年第三磨牙出现频率及牙冠发育完成时间与中国其他地区人口不同。
목적：통과수자화곡면단층편영상대상해지구청소년제삼마아적발육상황진행연구，위구강기출、림상응용화아치법의학적연구제공삼고자료。방법채용개량적Demirjian분류법대1440명상해지구청소년소박섭적수자화곡면단층편중제삼마아진행분석，비교불동성별、불동부위지간적분포차이，총결상해지구청소년제삼마아적발육상황。결과상해지구청소년재5세시제삼마아개시발육。녀성제삼마아18화28적출현빈솔명현고우남성( P <0．05)。결론상해지구청소년제삼마아출현빈솔급아관발육완성시간여중국기타지구인구불동。
Objective To provide reference data about the development of the third molars of Shanghai juveniles and adolescents. Methods A total of 1 440 digital panoramic radiographs of adolescents in Shanghai area were ex-amined. The mineralization status of the third molars was assessed using the formation stages described by Demir-jian with two modifications. Results The development of third molars in the Shanghai population was likely to be-gin at age 5 in both males and females. The third molars 18 and 28 showed significantly higher frequency in females than in males(P<0. 05). Conclusion The frequency and age reaching complete crown calcification of third mo-lars in Shanghai population is different from that in population from other regions of China.