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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.