Department of Oral and Maxillofacial Surgery, School of Dentistry, University of California at San Francisco, San Francisco, CA 94143-0438, USA.
Am J Orthod Dentofacial Orthop. 2011 Apr;139(4 Suppl):e377-89. doi: 10.1016/j.ajodo.2009.10.039.
The goal of this study was to look at mandibular cortical bone in live patients using cone-beam computed tomography (CBCT) to determine differences in cortical plate thicknesses and mandibular cross-sectional height and width in patients with different vertical facial dimensions.
A total of 111 scanned patients were used. Of these subjects, 43 were included in the average vertical facial dimension group (average face), 34 in the high vertical facial group (long face), and 34 in the low vertical facial group (square short face). Cross-sectional slices of the mandible were developed with the cone-beam scans to evaluate the cortical bone between the dentition at 13 locations. Each section was then measured at 8 sites, which included 1 height and 2 width measures of the cross-sectional area and 5 cortical plate thicknesses. An analysis of variance (ANOVA) with a posthoc Bonferroni statistical analysis was used with a significance level of P ≤0.0167.
The long-face group had slightly more narrow cortical bone than the other 2 facial groups at a few selected sites of the mandible. The height of the cross-sectional area of the mandible in the long-face group was shorter posteriorly than in the other 2 groups and became greater toward the symphysis.
Mandibular height and width differed more than cortical bone thickness among the 3 types of subjects with different vertical facial dimensions, but statistically significant differences were evident is some sites for cortical bone thickness.
本研究旨在通过锥形束 CT（CBCT）观察活体患者下颌骨皮质骨，以确定不同垂直面型患者下颌骨皮质板厚度、下颌骨横截面积高度和宽度的差异。
共使用了 111 名扫描患者。其中 43 名患者纳入平均垂直面型组（平均面型），34 名患者纳入高垂直面型组（长面型），34 名患者纳入低垂直面型组（方短面型）。通过锥形束扫描获得下颌骨的横断面切片，以评估牙列之间的皮质骨在 13 个部位的情况。然后，每个横断面在 8 个部位进行测量，包括横截面积的 1 个高度和 2 个宽度测量以及 5 个皮质板厚度。采用方差分析（ANOVA）和事后 Bonferroni 统计分析，显著性水平为 P≤0.0167。
长面型组在少数几个下颌骨特定部位的皮质骨比其他 2 个面型组稍窄。长面型组下颌骨横截面积的高度在后部比其他 2 个组短，在颏部逐渐增大。
在垂直面型不同的 3 组受试者中，下颌骨高度和宽度的差异大于皮质骨厚度的差异，但在一些皮质骨厚度部位存在统计学上的显著差异。
