Chintakanon K, Boonpinon P
Department of Dentistry, University of Adelaide, Australia.
Angle Orthod. 1998 Apr;68(2):153-60. doi: 10.1043/0003-3219(1998)068<0153:EEOTFP>2.3.CO;2.
The purpose of this research was to study the prevalence of ectopic eruption of the first permanent molars and possible etiologic factors. A group of 4,232 Thai students, from 6 to 9 years old, was examined. The prevalence of ectopic eruption of the first permanent molars in the subjects was 0.75%. Both the severity of the ectopic eruption and the amount of root resorption on the second primary molars were more pronounced in the maxilla than in the mandible. The important etiologic factors were the eruption path of the first permanent molars relative to reference lines and the size of the mandibular second primary molars. The amount of proximal caries did not seem to affect the prevalence of ectopic eruption.
本研究的目的是调查第一恒磨牙异位萌出的患病率及可能的病因。对一组4232名6至9岁的泰国学生进行了检查。受试者中第一恒磨牙异位萌出的患病率为0.75%。上颌第一恒磨牙异位萌出的严重程度及第二乳磨牙的牙根吸收量均比下颌更明显。重要的病因是第一恒磨牙相对于参考线的萌出路径以及下颌第二乳磨牙的大小。邻面龋的数量似乎不影响异位萌出的患病率。
