摘要
目的研究下颌第三磨牙阻生类型与手术时间之间的关系，并根据两者之间的关系建立一种新型下颌第三磨牙分类方法。方法收集413例下颌第三磨牙拔除病例数据。根据Pell-Gregory升支分类、Pell-Gregory殆平面分类和Winter分类3种分类方式将下颌第三磨牙阻生类型进行分类，分别以阻生指数Ri、0i、wi表示。下颌第三磨牙综合阻生指数以ci表示，ci=Ri＋0i＋wi。以手术时间表示拔除难度。使用方差分析研究各综合阻生指数之间手术时间差异，根据综合阻生指数以及手术时间将下颌第三磨牙进行分类。结果下颌第三磨牙拔除手术时间随着综合阻生指数增大而增加，部分下颌第三磨牙综合阻生指数之间手术时间有显著性差异，可以根据综合阻生指数以及手术时间将下颌第三磨牙分为6类（I-Ⅵ）。结论下颌第三磨牙拔除难度与阻生类型密切相关，新型分类方法可以更好的预测下颌第三磨牙拔除难度。
Objective To study the relationship between impaction types and extraction time and accordingly make a new classifica tion of mandibular third molars. Methods There were 413 mandibular third molars included in the study. The impaction types were classified according to Pell-Gregory classifications （ramus and occlusal） and Winter classification. Ri, Oi,Wi were used to represent the index of impaction respectively. Cirepresents comprehensive impaction index of mandibular third molars. Ci = Ri ＋ Oi ＋ Wi. Ex traction difficulty of mandibular third molars was measured by extraction time. ANOVA was used to compare the difference of extraction time between every two comprehensive impaetion indexes of mandibular third molars. Classify mandibular third molars according to comprehensive impaetion index and extraction time. Results The extracion time became longer with greater comprehensive impaetion index. There were significant differences in extraction time among mandibular third molars in some comprehensive impaction indexes. Mandibular third molars could be divided into six categories（ I - VI） according to comprehensive impaction index and extraction time. Conclusions There was a close relationship between the extraction difficulty and impaction types of mandibular third molars. The new established classification of mandibular third molars can reflect their extraction difficulty better.
出处
《口腔医学》
CAS
2014年第1期59-61,共3页
Stomatology
关键词
下颌第三磨牙
临床分类
阻生类型
手术时间
mandibular third molar
clinical classification
impaction types
extraction time
