临汾地区错（牙合）患者Bolton指数的研究

【作者】 谢国芳；

【导师】 甘晓榕；

【作者基本信息】 山西医科大学 ， 口腔正畸， 2005， 硕士

【摘要】 了解临汾地区安氏Ⅰ、Ⅱ、Ⅲ类错(牙合)、正常(牙合)患者Bolton指数的分布规律,以及安氏分类、前牙比、全牙比及不同拔牙模式对Bolton指数的影响。 方法: 随机选取符合条件的安氏错(牙合)模型120例,安氏Ⅰ、Ⅱ、Ⅲ类各40名,男女各半。按照个别正常(牙合)的标准选取个别正常(牙合)40名,男女各半。由作者用电子游标卡尺对160例模型上下颌第一恒磨牙到对侧第一恒磨牙之间共十二颗牙中每一颗牙的最大近远中径进行测量。按照Bolton公式计算出所有模型的前牙比、全牙比、后牙比,并对的安氏Ⅰ、Ⅱ、Ⅲ类120名患者进行模拟拔除4/4/4/4、5/5/5/5、4/4/5/5、5/5/4/4后Bolton指数进行计算。 结果: 1.正常(牙合)、安氏Ⅰ、Ⅱ、Ⅲ类错(牙合)的前牙比、全牙比、后牙比男性均大于女性,但是性别间无显著性差异,故男女合并为一组。 2.安氏各组人数分布:安氏Ⅰ、Ⅱ、Ⅲ类错(牙合)均为正常组>过小组>过大组,安氏Ⅰ类、Ⅱ类、Ⅲ类错(牙合)前牙比、全牙比患者人数分布无显著性差异。 3.各组间方差分析示:安氏Ⅰ类、Ⅱ类、Ⅲ类前牙比、全牙比、后牙比均无显著性差异。 4.Bolton指数过大组的前牙比在安氏Ⅲ类与I类、II类、正常(牙合)间的比较有显著差异,过小组、正常组的前牙比、全牙比以及过大组的全牙比在安氏在Ⅰ类、Ⅱ类、Ⅲ类、正常(牙合)间无显著性差异。 5.几种常规拔牙模式均引起拔牙后Bolton指数的不协调率增加。 6.拔4/4/4/4、4/4/5/5组较拔5/5/5/5、5/5/4/4组Bolton指数值大,两者之间有显著性差异(P<0.05)。 7.Logistic回归分析示拔除4颗前磨牙后,其Bolton指数不调与否,与拔牙前的前牙比、全牙比、拔牙模式有关(P<0.05),与安氏分类无更多还原

【Abstract】 Bolton analysis of maloccluson patients in LinfenThis paper aims to study distributions of Bolton anterior and overall ratios among Class Ⅰ、Ⅱ and Ⅲ malocclusion groups.The effection of any tooth extraction combinations、Angle’s class、 anterior ratio、 overall ratio on Bolton index was also studied. Methods120 dental casts of orthodontic patients were selected randomly, 40 subjects of Angle class Ⅰ、Ⅱ and Ⅲ were arranged with half man and half woman. 40 subjects with normal occlusion were choosed according to the standard in which 20 were females and 20 were males. Each tooth crown mesiodistal size between the first molar and the opposite molar of 160 dental casts was measured by electrical calliper .Anterior ratio 、 overall ratio and posterior ratio were calculated , according Bolton rate standards. Also Angle class Ⅰ、Ⅱ and Ⅲ’s ratios were counted under the condition of hypothetical tooth extrations 4/4/4/4 、 5/5/5/5、 4/4/5/5、 5/5/4/4. Results1.No statistically significant sex difference was found between anterior ratio 、 overall ratio and posterior ratio in the 3 malocclusions groups and normal occlusion but the means of males was larger than that of the female. As a result, females and males were combined to be a group.2.The distribution of number in Angle groups was as follows: the number of patients in the Bolton normal group was the most, it was the least in the Bolton big group.In the anterior ratio, no statistically significant differences were found in class Ⅰ 、 class Ⅱ and class Ⅲ. In the overall ratio the same results were found in class Ⅰ 、 class Ⅱ and class Ⅲ.3. The differences of anterior 、 overall and posterior ratios were statistically insignificant.4. Statistically significant differences were found between class III and other groups in the Bolton big group for the anterior ratio .But no statistically significant difference was found in anterior ratio of Bolton big group.In the anterior and overall ratios in the Bolton small group and normal group, there’s no statistically significant difference.5. The percent of tooth-size discrepancy was increased on the condition of some kinds of extraction models.6. Satistically significant differences were found after extracting更多还原