北京大学学报（医学版）2018，Vol.50Issue(1)：98-103,6.DOI:10.3969/j.issn.1671-167X.2018.01.017
骨性Ⅱ类和Ⅲ类高角错(牙合)患者下切牙区的牙槽骨形态分析
Morphological analysis of alveolar bone of anterior mandible in high-angle skeletal class Ⅱ and class Ⅲ malocclusions assessed with cone-beam computed tomography
摘要
Abstract
Objective: To evaluate the difference of features of alveolar bone support under lower anterior teeth between high-angle adults with skeletal class Ⅱ malocclusions and high-angle adults presenting skeletal class Ⅲ malocclusions by using cone-beam computed tomography (CBCT). Methods: Patients who had taken the images of CBCT were selected from the Peking University School and Hospital of Stomatology between October 2015 and August 2017. The CBCT archives from 62 high-angle adult cases without orthodontic treatment were divided into two groups based on their sagittal jaw relationships: skeletal class Ⅱ and skeletal class Ⅲ. vertical bone level (VBL),alveolar bone area (ABA),and the width of alveolar bone were measured respectively at the 2 mm,4 mm,6 mm below the cemento-enamel junction (CEJ) level and at the apical level. After that, independent samples t-tests were conducted for statistical comparisons. Results: The ABA of the mandibular alveolar bone in the area of lower anterior teeth was significantly thinner in the patients of skeletal class Ⅲ than those of skeletal class Ⅱ,especially in terms of the apical ABA,total ABA on the labial and lingual sides and the ABA at 6 mm below CEJ level on the lingual side (P <0.05 ). The thickness of the alveolar bone of mandibular anterior teeth was significantly thinner in the subjects of skeletal class Ⅲ than those of skeletal class Ⅱ, especially regarding the apical level on the labial and lingual side and at the level of 4 mm,6 mm below CEJ level on the lingual side (P <0. 05). Conclusion: The ABA and the thickness of the alveolar bone of mandibular anterior teeth were significantly thinner in the group of skeletal class Ⅲ adult patients with high-angle when compared with the sample of high-angle skeletal class Ⅱ adult cases. We recommend orthodontists to be more cautious in treatment of high-angle skeletal class Ⅲ patients,especially pay attention to control the torque of lower anterior teeth during forward and backward movement,in case that the apical root might be absorbed or fenestration happen in the area of lower anterior teeth.关键词
错(牙合)/牙槽骨/锥束计算机体层摄影术Key words
Malocclusion/Alveolar bone/Cone-beam computed tomography分类
医药卫生引用本文复制引用
马静,江久汇..骨性Ⅱ类和Ⅲ类高角错(牙合)患者下切牙区的牙槽骨形态分析[J].北京大学学报（医学版）,2018,50(1):98-103,6.基金项目
国家自然科学基金(81571002)和北京市自然科学基金(7162203)资助 （81571002）
Supported by the National Natural Science Foundation of China (81571002) and Beijing Natural Science Foundation (7162203) （81571002）
