Comparison of the mandibular hinge axis in adult patients with facial asymmetry with and without posterior unilateral crossbite
Comparison of the mandibular hinge axis in adult patients with facial asymmetry with and without posterior unilateral crossbite
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成人面部不对称伴与不伴单侧后反牙合患者下颌铰轴的比较
DOI：
10.1093/ejo/cju009
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发表时间：
2015
影响因子：
2.6
通讯作者：
Keiji Moriyama
中科院分区：
文献类型：
--
作者：
Jun-ichi Takada;Jun J Miyamoto;Toshiaki Yokota;Takashi Ono;Keiji Moriyama
背景/目的尽管有研究表明，单侧后牙反牙合(PUXB)的成人面部不对称患者的下颌铰链轴(MHA)可能比无PUXB的患者更倾斜，但颅面形态是否与MHA有关仍不清楚。[方法]30例正畸前患者(PUXB组和非PUXB组，n=15)，女性9例，男性6例，平均年龄23.2岁。用计算机轴位摄影测量MHA，并在后前位和下顶位X线片上复制。通过头影测量分析评估骨骼和牙齿成分的形态不对称性以及下颌骨的位置偏差。采用Mann-WhitneyU检验和Spearman等级相关系数进行统计分析。结果PUXB组和非PUXB组之间的骨骼和牙齿成分均有显著差异。PUXB组MHA向下颌偏移侧的倾斜度均大于非PUXB组。结论：本研究结果提示，与PUXB相关的错牙合畸形患者，面不对称的成人患者不仅表现出下颌不对称，而且伴随着MHA的三维移位，还表现出下颌不对称性，以及髁突头部和关节窝的重塑。
Background/ObjectivesAlthough it has been suggested that adult patients with facial asymmetry with posterior unilateral crossbite (PUXB) may have a more tilted mandibular hinge axis (MHA) than those without PUXB, whether craniofacial morphology is associated with the MHA remains unclear. The purpose of this study was to compare the craniofacial morphology and MHA in adult subjects with post-growth facial asymmetry with and without PUXB.Subjects/MethodsThirty pre-orthodontic patients (PUXB and non-PUXB groups,n= 15 each, 9 females and 6 males, mean age: 23.2 years) participated in the study. The MHA was measured by computerized axiography and duplicated on posteroanterior and submentovertex cephalometric radiographs. Morphological asymmetry was evaluated for both skeletal and dental components and positional deviation of the mandible by cephalometric analysis. The Mann–WhitneyU-test and Spearman’s correlation coefficient by rank were used for statistical analysis. The level of statistical significance was set atP< 0.05.ResultsSignificant differences in both skeletal and dental components were found between the PUXB and non-PUXB groups. In both the frontal and horizontal dimensions, the inclination of the MHA towards the mandibular shifted side was greater in the PUXB group than in the non-PUXB group.Conclusions/ImplicationsThe present findings suggest that facially asymmetric adult subjects with malocclusions associated with PUXB exhibit not only mandibular asymmetry but also remodelling of the condylar head and glenoid fossa that accompanies the three-dimensional shifting of the MHA.