摘要
目的 探讨正畸患者第三磨牙牙胚缺失情况 ,分析第三磨牙牙胚缺失与错畸形间的关系。方法 通过全景曲面断层片判定第三磨牙牙胚的缺失情况 ,通过测量ANB角确定患者的矢状骨型 ,对第三磨牙牙胚的缺失与性别、部位及骨型间的关系进行统计学分析。结果 男性第三磨牙牙胚缺失人数比例 (37 0 % )高于女性 (2 4 6 % ) ;第三磨牙牙胚缺失与左右侧无关 ;骨型Ⅲ类错病例第三磨牙牙胚缺失率高于其他两类 ,其差别具有统计学意义 ,其中差别主要在于上颌 ;骨型Ⅰ、Ⅱ类错病例第三磨牙牙胚缺失率的差别无统计学意义。结论 男性比女性第三磨牙牙胚缺失几率大 ;矢状骨型与第三磨牙牙胚缺失有关 ,Ⅲ类骨型病例上颌第三磨牙牙胚缺失率要高于Ⅰ、Ⅱ类骨型病例。
Objective To examine the absence of the third molar germs in orthodontic patients and to evaluate the relationship between third molar germs and malocclusion.Methods The subjects comprised 234 patients (male 92, female 142) from the orthodontic clinic whose ages were 14-18 .The assessments of the third molar germs were made from panoramic radiographs, and the assessments of ANB angle were made from lateral cephalograms. All the data were analyzed by statistic χ+2 test.Results The percentage of male who missed one or more third molar gems (37.0%) was higher than that of female (24.6%). There was no significant difference between the absent frequencies of third molar germs on left and right sides in either maxilla or mandible. The absent percentage of third molar germs in skeletal Ⅲ subjects was higher than those in both skeletal class Ⅰ and Ⅱ subjects. The absent difference of third molar germs was in upper arches (P<0.05), but not in lower arches (P>0.05). There was no significant difference in absent percentage of third molar germs between skeletal class Ⅰ and Ⅱ subjects.Conclusion Male patients have higher absent frequencies of third molar germs than female ones. Skeletal class Ⅲ patients have higher absence of third molar germs in upper jaws than skeletal class Ⅰ and Ⅱ patients.
出处
《华西口腔医学杂志》
CAS
CSCD
北大核心
2004年第6期493-495,共3页
West China Journal of Stomatology
关键词
第三磨牙牙胚
正畸
统计分析
third molar germ
orthodontics
statistic analysis
