不同面型的机械行为与下颌支长度。
Mechanobehavior and mandibular ramus length in different facial phenotypes.
出版信息
Angle Orthod. 2020 Nov 1;90(6):866-872. doi: 10.2319/032420-217.1.
OBJECTIVES
To test the hypotheses that mechanobehavior scores (MBS) were correlated with mandibular ramus lengths (Co-Go) and differed between facial phenotypes.
MATERIALS AND METHODS
Subjects gave informed consent to participate. Co-Go (mm), mandibular plane angles (SN-GoGn, °), and three-dimensional anatomy were derived from cephalometric radiography or cone beam computed tomography. Temporomandibular joint (TMJ) energy densities (ED) (mJ/mm3) were measured using dynamic stereometry and duty factors (DF) (%) were measured from electromyography, to calculate MBS (= ED2 × DF,) for each TMJ. Polynomial regressions, K-means cluster analysis, and analysis of variance (ANOVA) with Tukey post-hoc tests were employed.
RESULTS
Fifty females and 23 males produced replete data. Polynomial regressions showed MBS were correlated with Co-Go (females, R2 = 0.57; males, R2 = 0.81). Cluster analysis identified three groups (P < .001). Dolichofacial subjects, with shorter normalized Co-Go, clustered into two subgroups with low and high MBS compared to brachyfacial subjects with longer Co-Go. SN-GoGn was significantly larger (P < .03) in the dolichofacial subgroups combined (33.0 ± 5.9°) compared to the brachyfacial group (29.8 ± 5.5°).
CONCLUSIONS
MBS correlated with Co-Go within sexes and differed significantly between brachyfacial and dolichofacial subjects.
目的
检验以下假设，即机械行为评分（MBS）与下颌支长度（Co-Go）相关，且在面型间存在差异。
材料与方法
研究对象签署知情同意书后参与研究。通过头颅侧位片或锥形束 CT 获得 Co-Go（mm）、下颌平面角（SN-GoGn，°）和三维解剖结构。使用动态立体测量法测量颞下颌关节（TMJ）能量密度（ED）（mJ/mm3），从肌电图中测量功能因子（DF）（%），以计算每个 TMJ 的 MBS（= ED2 × DF）。采用多项式回归、K 均值聚类分析和方差分析（ANOVA），并使用 Tukey 事后检验进行分析。
结果
50 名女性和 23 名男性的研究数据完整。多项式回归显示 MBS 与 Co-Go 相关（女性，R2 = 0.57；男性，R2 = 0.81）。聚类分析确定了三个组（P <.001）。与 Co-Go 较长的短面型相比，下颌支长度较短的长面型患者聚类为低 MBS 和高 MBS 两组。Dolichofacial 组的 SN-GoGn 显著更大（P <.03）（33.0 ± 5.9°），与 brachyfacial 组（29.8 ± 5.5°）相比。
结论
MBS 在性别内与 Co-Go 相关，且在短面型和长面型患者间存在显著差异。
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