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目的 :通过对第三磨牙先天缺失情况及缺失数目的研究,分析第三磨牙先天缺失与下颌角发育之间的关系。方法:选取227例患者的曲面体层片及头颅侧位片作为实验组,其中每例至少有1颗第三磨牙先天缺失;同时选取227例4颗第三磨牙均存在的患者作为对照组。采用Winceph8.0软件对所有研究对象的头颅侧位片进行测量,采用SPSS17.0软件包对数据进行独立样本t检验、单样本t检验、方差分析、线性回归分析。结果 :对照组的Gonial角、上部Gonial角、下部Gonial角均大于实验组,且有显著差异,但性别间无显著差异。Gonial角、上部Gonial角、下部Gonial角与第三磨牙先天缺失数目之间无显著差异。结论:第三磨牙先天缺失与Gonial角、上部Gonial角、下部Gonial角有密切联系,但与性别无显著关系,患者具有短面的颅面结构。第三磨牙先天缺失个数与Gonial角等无显著联系。
OBJECTIVE: To study the relationship between congenital absence of third molars and mandibular angle development by studying the congenital absence and absence of third molars. Methods: Twenty-seven patients with curved surface slice and cephalometric slice were selected as the experimental group. At least one third molars were congenital missing in each case. 227 patients with 4 third molars were selected as the control group. Winceph8.0 software was used to measure the cephalometric slices of all the subjects. SPSS 17.0 software package was used for independent sample t-test, one-sample t-test, ANOVA and linear regression analysis. Results: The Gonial angle, the upper Gonial angle and the lower Gonial angle in the control group were all greater than those in the experimental group, with significant differences, but no significant differences between the sexes. There was no significant difference between the Gonial angle, the upper Gonial angle, the lower Gonial angle and the number of birth defects in the third molars. Conclusion: The congenital absence of third molars is closely related to Gonial angle, upper Gonial angle and lower Gonial angle. However, there is no significant relationship with gender, and the patient has a short craniofacial structure. There was no significant correlation between the number of birth defects and the number of Gonial angle in the third molars.