Department of Orthodontics, University Center of the Hermínio Ometto Foundation, FHO, Av. Dr. Maximiliano Baruto, 500, Jd. Universitário, Araras, SP, 13607-339, Brazil.
Department of Dentistry, Faculdade Modal, Belo Horizonte, Brazil.
Surg Radiol Anat. 2021 Feb;43(2):267-274. doi: 10.1007/s00276-020-02577-6. Epub 2020 Sep 23.
This study aimed to quantify mandibular ramus height and condylar distances asymmetry indexes in adult patients with different vertical facial growth pattern using Cone Beam computed tomography (CBCT).
An observational cross-sectional study was conducted by using CBCT of 159 patients (mean age 26.36 ± 5.32 years). Vistadent 3D software was used to determine the facial pattern in 3 groups (N = 53): hypodivergent, normodivergent and hyperdivergent-by Ricketts VERT index. Mandibular ramus height and the condylar linear distance in relation to the median sagittal plane were evaluated. The asymmetry index was calculated considering the right and left sides. Data were analyzed by generalized linear models and Tukey post-hoc test (α = 0.05).
Significantly lower values were found for the left and right mandibular ramus height in the hyperdivergent skeletal pattern (P < 0.05). There was no statistically significant difference for condylar and intercondylar distances among the facial groups (P > 0.05). Asymmetry indexes (mandibular ramus height and condylar distance) were similar, and no statistically significant differences were found among the skeletal patterns. In most subjects, the severity of mandibular ramus height asymmetry varied from light to not clinically significant independently of the facial type.
The findings suggest that vertical facial growth pattern not affected the asymmetry index of mandibular ramus height and the intercondylar distance. The results also demonstrated significantly shorter mandibular ramus height for the hyperdivergent skeletal pattern individuals.
本研究旨在使用锥形束计算机断层扫描（CBCT）定量测量不同垂直面型生长模式成年患者下颌支高度和髁突距离的不对称指数。
通过使用 159 名患者（平均年龄 26.36 ± 5.32 岁）的 CBCT 进行了一项观察性横断面研究。使用 Vistadent 3D 软件根据 Ricketts VERT 指数将面型分为 3 组（N=53）：低角型、均角型和高角型。评估下颌支高度和髁突线性距离与正中矢状面的关系。考虑到左右两侧，计算了不对称指数。使用广义线性模型和 Tukey 事后检验（α=0.05）对数据进行分析。
在高角骨骼模式中，左侧和右侧下颌支高度的数值明显较低（P<0.05）。在面型组之间，髁突和髁间距离没有统计学上的显著差异（P>0.05）。不对称指数（下颌支高度和髁突距离）相似，骨骼模式之间没有统计学上的显著差异。在大多数患者中，下颌支高度不对称的严重程度从轻度到无临床意义不等，与面型无关。
这些发现表明，垂直面型生长模式不会影响下颌支高度和髁突间距离的不对称指数。结果还表明，高角骨骼模式个体的下颌支高度明显较短。
