基于 CBCT 图像和统计形状分析的不同垂直型类Ⅰ和类Ⅱ患者下颌横断面积形态的比较。
Comparison of mandibular cross-sectional morphology between Class I and Class II subjects with different vertical patterns: based on CBCT images and statistical shape analysis.
机构信息
Department of Orthodontics, National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing Key Laboratory of Digital Stomatology, Peking University School and Hospital of Stomatology, No. 22 Zhongguancun Avenue South, Haidian District, Beijing, 100081, China.
Center for Applied Statistics, School of Statistics, Renmin University of China, No. 59 Zhongguancun Street, Haidian District, Beijing, 100872, China.
出版信息
BMC Oral Health. 2021 May 5;21(1):238. doi: 10.1186/s12903-021-01591-3.
BACKGROUND
This study is aimed to (1) investigate the influence of sagittal and vertical patterns on mandibular cross-sectional morphology and to (2) provide visualized mandibular cross-sectional morphology in different groups with General Procrustes Analysis (GPA), canonical variance analysis (CVA) and discriminant function analysis (DFA).
METHODS
324 cone-beam computed tomography (CBCT) images were collected to analyze mandibular cross-sectional morphology and were categorized into 12 groups according to sagittal and vertical pattern and gender. One-way analysis of variance (ANOVA) was used to compare the difference among the groups. Thirty equidistant points were marked along the contour of mandibular cross-section and GPA, CVA and DFA were applied.
RESULTS
(1) Mandibular height in hyperdivergent groups was significantly higher than that in normodivergent and hypodivergent groups (P < 0.05). (2) Hypodivergent groups showed significantly wider upper third of mandibular width from symphysis to molar region than that in hyperdivergent group (P < 0.05), except for the premolar and molar regions in male groups (P > 0.05). (3) Class II hyperdivergent group showed narrowest lower third width in the molar region, with the mean value of 12.03 mm in females and 11.98 mm in males. (4) For males and females, the ratio between height and lower third width at symphysis was significantly higher in Class II hyperdivergent group than that in Class I hyperdivergent group (P < 0.05).
CONCLUSIONS
(1) The influence of vertical facial patterns on mandibular cross-sectional morphology is more obvious than that of sagittal skeletal pattern. (2) Subjects with increased vertical dimension presented with a remarkable "slimer" mandibular cross-sectional morphology at symphysis. (3) A deeper curve along the anterior contour of symphysis in Class II hyperdivergent group was noted with GPA.
背景
本研究旨在：（1）探讨矢状和垂直模式对下颌横截面积形态的影响；（2）通过广义Procrustes 分析（GPA）、典范方差分析（CVA）和判别函数分析（DFA），为不同组别的下颌横截面积形态提供可视化结果。
方法
共采集 324 例锥形束 CT（CBCT）图像，分析下颌横截面积形态，根据矢状和垂直模式以及性别将其分为 12 组。采用单因素方差分析（ANOVA）比较组间差异。沿下颌横截面积轮廓标记 30 个等距点，并应用 GPA、CVA 和 DFA。
结果
（1）高角组下颌高度明显高于均角组和低角组（P<0.05）。（2）与高角组相比，低角组从颏部到磨牙区的下颌宽度上三分之一明显更宽（P<0.05），但男性组的前磨牙和磨牙区除外（P>0.05）。（3）女性中，Class II 高角组磨牙区下颌下三分之一最窄，平均值为 12.03mm；男性中，Class II 高角组磨牙区下颌下三分之一最窄，平均值为 11.98mm。（4）对于男性和女性，Class II 高角组颏部的高度与下三分之一宽度之比明显高于 Class I 高角组（P<0.05）。
结论
（1）垂直面型对上颌横截面积形态的影响比矢状骨型更明显。（2）垂直向增加的患者在下颌颏部呈现出明显更“苗条”的下颌横截面积形态。（3）Class II 高角组下颌前轮廓线的 GPA 显示出更陡峭的曲线。
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