成人骨性Ⅲ类与Ⅰ类错（牙合）下颌体横截面差异性的CBCT研究  

Comparative study of cross-sectional mandibular morphology between skeletal Class Ⅲ and Class Ⅰ adult patients with CBCT

作　　者：宋宇 林辉 于艳玲[2] 

机构地区：[1]青岛市口腔医院,山东266000 [2]滨州医学院附属烟台口腔医院,山东264000

出　　处：《中华口腔正畸学杂志》2015年第4期188-191,共4页Chinese Journal of Orthodontics

基　　金：青岛市卫生局资助课题（2014-WJZD142）

摘　　要：目的 利用CBCT测量分析成人下颌体横截面的相关形态学指征,比较骨性Ⅲ类和骨性Ⅰ类下颌体横截面的相关指标的差异.方法 选取青岛市口腔医院就诊的骨性Ⅲ类错（牙合）18例患者,骨性Ⅰ类错（牙合）16例患者,年龄18～33岁,平均24.5岁.均拍摄CBCT,测量右侧下颌体7个截面的牙齿倾斜度、下颌体截面倾斜度和根尖牙槽骨唇舌侧厚度,对结果进行独立样本t检验.结果 ①骨性Ⅲ类在前牙区和磨牙区牙齿倾斜度较骨性Ⅰ类大（P＜0.05）;②骨性Ⅲ类与骨性Ⅰ类下颌体截面倾斜度在各个区域无统计学的差异;③骨性Ⅲ类前牙区根尖唇侧牙槽骨厚度（下颌中切牙平均（2.30±0.39）mm较骨性Ⅰ类平均（3.75±1.31）mm）薄（P＜0.05）,根尖舌侧牙槽骨厚度（下颌中切牙平均（4.75±0.45）mm较骨性Ⅰ类平均（4.03±0.45）mm厚（P＜0.05）.结论 通过CBCT分析比较,骨性Ⅲ类较骨性Ⅰ类在下颌体横截面的某些形态特征具有明显差异,在临床正畸与正颌外科时应注意这些差异.Objective The study was to analyze features of mandibular body cross-sections in skeletal Class Ⅲ and Class Ⅰ malocclusion adult patients using CBCT and to compare morphology differences between them.Methods 18 patients with Class Ⅲ malocclusion and 16 patients with Class Ⅰ malocclusion were selected （18～33 years of age with a mean of 24.5 years old）.Their CBCT images were taken and measured the following indicators in 7 different cross-sections of the right mandibular body： tooth angulation, angle of the mandibular body in cross-sections and labial or lingual alveolar bone thickness at the root apex.Statistical tests were performed using independent samples t-test.Results 1.Tooth angulation in posterior region was larger in skeletal Class Ⅲ than in skeletal Class Ⅰ （P〈0.05） 2.The angle of mandibular body in cross-sections was not statistically significant in two groups.3.For skeletal Class Ⅲ, thickness of the labial alveolar bone at the root apex in anterior tooth region （2.30±0.39） mm for lower lateral incisor was thicker than those in skeletal Class Ⅰ （3.75±1.31） mm, and thickness of the lingual alveolar bone at the root apex in anterior tooth region （4.75±0.45） mm for lower lateral incisor is thinner than those in skeletal Class Ⅰ （4.03± 0.45） mm（P〈0.05）.Conclusions Mandibular body cross-sections between adult skeletal Class Ⅲ and Class Ⅰ patients has significant differences in some aspects, which should be taken care in clinical practice.

关 键 词：骨性Ⅲ类 骨性Ⅰ类 下颌骨 冠状面 CBCT 

分 类 号：R783.5[医药卫生—口腔医学]