摘要
背景:错牙合畸形以AngleⅠ类检出率最高,但安氏分类受限于没有考虑到牙、颌、面结构在长、宽、高三维方向形成错牙合畸形的综合机制,且下颌骨的位置及面部骨骼对一个人的外貌有着深远影响。因此,在正畸矫治前应当充分考虑下颌骨及颏部的形态特征。目的:通过锥形束CT多平面重建测量成年女性骨性Ⅰ类不同垂直骨面型颏部及下颌骨三维形态,比较其三维形态在不同垂直骨面型存在的异同。方法:根据前颅底平面与下颌平面的夹角(SN-MP角),将86例18-35岁骨性Ⅰ类女性患者治疗前的锥形束CT导入MIMCS 19.0进行多平面重建,划分为低于29°(低角,30例)、29°-39°(均角,30例)、大于39°(高角,26例)3组,进行下颌骨线距及角度测量,以及对下颌轮廓进行三维重建测量。结果与结论:随着下颌平面角增加,下颌骨形态趋于:①下颌升支变短,下颌骨体部增长;②下颌角切迹逐渐加深,下颌角相对颅颌开张度增加;③颏部牙槽骨较长,颏部突度降低;④颏部发生逆时针旋转;下前牙代偿性舌倾。结果表明,成年女性骨性Ⅰ类不同垂直骨面型下颌骨及颏部形态不同,下颌平面角与下颌骨及颏部形态存在相关关系。
BACKGROUND: A review of previous epidemiological investigations shows that the detection rate of malocclusion is the highest in Angle Ⅰ, but the classification is limited by the failure to consider the comprehensive mechanism of the formation of malocclusion in the three-dimensional direction of the length, width and height of teeth, jaws and facial structures, and the profound impact of the position of the mandible and facial bones on a person’s appearance. Therefore, the morphological characteristics of the mandible and chin should be fully considered before orthodontic treatment.OBJECTIVE: To compare the similarities and differences of the three-dimensional facial morphology in adult females with different vertical skeletal types of skeletal Class Ⅰ by measuring the three-dimensional morphology of the chins and mandibles through cone-beam CT multi-planar reconstruction.METHODS: According to SN-MP angle, the cone-beam CT images of 86 females with skeletal Class Ⅰ aged from 18 to 35 years were imported into MIMCS19.0 to make multi-planar reconstruction, and then the data was divided into three groups: < 29°(low angle group, 30 cases), 29°-39°(average angle group, 30 cases), and > 39°(high angle group, 26 cases). Then, the mandibular linear distance and angle were measured, and the mandibular outline was measured through the three-dimensional reconstruction.RESULTS AND CONCLUSION: With the increase of mandibular plane angle, the morphology of mandible tended to be:(1) the mandible ascending ramus became shorter, and the mandible body grew;(2) the notch of mandibular angle deepened gradually, and the opening of the mandibular angle increased gradually relative to the cranial-jaw;(3) the alveolar process of the chin became longer and the shape of chin became gentle;(4) counterclockwise rotation of the chin and compensatory inclination of lower anterior teeth towards tongue occurred. Comparing different vertical skeletal types of skeletal Class I in adult females, both the morphologies of the mandible an
作者
樊佳兵
张军梅
Fan Jiabing;Zhang Junmei(School of Stomatology,Guizhou Medical University,Guiyang 550004,Guizhou Province,China;Department of Orthodontics,the Affiliated Stomatological Hospital of Guizhou Medical University,Guiyang 550004,Guizhou Province,China)
出处
《中国组织工程研究》
CAS
北大核心
2021年第8期1177-1183,共7页
Chinese Journal of Tissue Engineering Research
基金
贵阳市科技攻关项目(筑科合同[20161001]018号),项目负责人:张军梅。
关键词
成年女性
垂直骨面型
锥形束CT
下颌骨
骨性Ⅰ类
adult female
vertical skeletal type
cone-beam CT
mandible
Class Ⅰ malocclusion
