Relationship between the masticatory muscles and mandibular skeleton in mandibular Prognathism with and without asymmetry
Relationship between the masticatory muscles and mandibular skeleton in mandibular Prognathism with and without asymmetry
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DOI：
10.1016/j.joms.2006.09.024
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发表时间：
2007-08-01
影响因子：
1.9
通讯作者：
Lee, Sang-Han
中科院分区：
文献类型：
--
作者：
Kwon, Tae-Geon;Lee, Ki-Ho;Lee, Sang-Han
目的：本研究的目的是评估咀嚼肌体积和下颌骨骼测量在有和没有面部不对称的患者之间的关系。这样做是为了确定不对称下颌前突是否与咀嚼肌不对称有关。患者与方法：选取40例成年下颌前突患者，分为不对称组（n = 20）和不对称组（n = 20）。使用三维重构的计算机断层扫描（CT）图像，评估和比较咀嚼肌（咬肌、颞肌、内侧肌和外侧翼状肌）的体积和各种骨骼测量（半下颌体积、下颌高度、体长、下颌长度、角）。左右差异用不对称指数{（右-左）/左，%}表示。结果：结果显示，在不对称组中，下颌骨较长一侧（下巴偏离对侧）表现出更长的下颌和体长，更宽的角，更大的半下颌体积，更少的内侧翼状体积，而非对称组在骨骼和肌肉测量方面没有统计学差异。相关性分析表明，面部不对称的患者与面部对称的患者相比，没有相似的肌肉-骨骼关系模式。结论：下颌前突住院患者，两侧肌肉体积的差异可反映骨骼结构空间解剖的差异，不能预测下颌骨骼不对称。(c) 2007年美国口腔颌面外科医师协会。
Purpose: The purpose of the present study was to evaluate the relationship between masticatory muscle volume and mandibular skeletal measurements in patients with and without facial asymmetry. This was done in order to determine whether asymmetric mandibular prognathism is related to masticatory muscle asymmetry.Patients and Methods: The study was conducted with 40 adult patients with mandibular prognathism composed of 2 groups, the asymmetry group (n = 20) and the nonasymmetry group (n = 20). Using 3-dimensional reformatted computed tomography (CT) images, the volume of masticatory muscle (masseter, temporal, medial, and lateral pterygoid muscles) and various skeletal measurements (hemimandibular volume, ramal height, body length, mandibular length, gonial angle) were evaluated and compared. The right-left difference was expressed by an asymmetry index {(right - left)/left, %}.Results: The results showed that in the asymmetry group, the longer mandibular side (contralateral side of chin deviation) exhibited longer ramal and body length, a wider gonial angle, and more hemimandibular volume with less medial pterygoid volume, whereas the nonasymmetry group did not show a statistical bilateral difference between the skeletal and muscular measurements. The correlation analysis showed that patients with facial asymmetry did not have similar patterns of muscle-bone relation as compared with the symmetrical subjects.Conclusion: inpatients with mandibular prognathism, the bilateral difference in muscle volume would reflect the difference in the spatial anatomy of a skeletal structure and could not predict mandibular skeletal asymmetry. (c) 2007 American Association of Oral and Maxillofacial Surgeons.