426例10岁儿童的第三磨牙发育状况分析  

Analysis on the third molar in 426 ten-year-olds

作　　者：吴万红[1] 王虎[1] 李果[1] 袁珊珊[1] 任家银[1] 赵书平[1] 

机构地区：[1]四川大学华西口腔医院放射科,四川成都610041

出　　处：《临床口腔医学杂志》2011年第11期664-667,共4页Journal of Clinical Stomatology

摘　　要：目的:通过全颌曲面断层片分析10岁儿童第三磨牙的生长发育情况,为临床和基础研究提供参考。方法:从华西口腔医院影像资料库中随机抽取2009年6月～2010年7月期间拍摄的10岁儿童全颌曲面断层片共426张,研究分析第三磨牙的生长发育情况。结果:32.57%的第三磨牙牙位处不能观察到牙胚或钙化影像,女性较男性的发育较早,下颌第三磨牙发育较上颌第三磨牙相对早,左侧和右侧第三磨牙发育无明显差别。第三磨牙近远中径为(11.42±0.86)mm,牙齿长度为(8.44±1.30)mm,第三磨牙与下颌第二磨牙牙体长轴所成夹角为30.79±13.82°。结论:大部分10岁儿童的第三磨牙处于牙冠钙化阶段,同龄女性第三磨牙较男性的发育较早,下颌较上颌发育较早,左右侧发育无明显差别。第三磨牙的近远中径与牙齿长度,男女、左右间均无明显差异。第三磨牙与第二磨牙牙体长轴所成夹角,右侧大于左侧,两侧间有明显差异。Objective：To investigate the development of third molar embryo of ten years old teenagers through panoramic radiographs in Chengdu.Method：Randomly selected 426 panoramic radiographs between June 2009 and 2010 July from the database of West China Stomatology Hospital of Sichuan University,and then performed a cross-sectional study about the third molar development.All the data were statistically analysed.Result：The rate we cannot find the tooth germ or mineral was 32.57 % by teeth.The development of the third molar appeared earlier in girls than in boys,and earlier in the mandible than in the maxillary.There was no significant difference between the left and right side.Mesiodistal croun width of mandibular the third molar was（11.42±0.86）mm.The length of the mandibular the third molar through the long axis was（8.44±1.30）mm.There were no significant diferences in Mesiodistal croun width and the length between male and female and between the left and right side.The angle between the long axis of the third molar and the second molar was（30.79±13.82） degrees.There were significant diferences in the angle between the left and the right side,as the angle 28.34 degrees in left and 33.29 degrees in right.Conclusion：Most of the third molar of the ten years old teenagers were at the crown mineralizing stage.The angle between the long axis of the third molar and the second molar in right side was larger than that in the left.

关 键 词：全景片 第三磨牙 牙胚 发育 

分 类 号：R780.2[医药卫生—口腔医学]