Manifestation of preferred chewing side for hard food on TMJ disc displacement side
Manifestation of preferred chewing side for hard food on TMJ disc displacement side
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DOI：
10.1111/j.1365-2842.2010.02128.x
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发表时间：
2011-01-01
影响因子：
2.9
通讯作者：
Minagi, S.
中科院分区：
文献类型：
--
作者：
Ratnasari, A.;Hasegawa, K.;Minagi, S.
本研究的目的是揭示咀嚼侧偏好与颞下颌关节盘前移位（ADD）的关系。从冈山大学牙科学校的志愿者学生中选择了32名年龄在26至34岁之间的健康受试者。受试者被要求自由咀嚼两种测试食物，牛肉干（硬食物）和雪纺蛋糕（软食物），从而预期TMJ上的机械负荷量不同。开始咀嚼后1、4和7秒，要求受试者暂时张开嘴，拍摄他们口腔的数字图像。通过处理数字图像测量团注放置区域，计算为团注区域的像素数。面积不对称指数用于确定首选咀嚼侧（PCS）。采用闭口位斜矢状位MRI扫描评价关节盘位置。在无症状的受试者与ADD，一个显着的优势PCS同侧的ADD期间，咀嚼坚硬的食物。相反，没有发现单侧ADD和PCS之间的相关性为软食物。根据本研究结果，ADD可能是硬质食品PCS的关联因子。因此，考虑到TMJ的机械负荷，有必要将PCS的概念分为至少两类，一类是硬食物，一类是软食物。
The purpose of this study was to reveal the relationship between chewing-side preference and anterior disc displacement (ADD) of the TMJ. Thirty-two healthy subjects with ages ranging from 26 to 34 years were selected from volunteer students at the Okayama University Dental School. Subjects were asked to chew freely with two kinds of test foods, beef jerky (hard food) and chiffon cake (soft food), thus expecting different amounts of mechanical loading on the TMJ. One, 4, and 7 s after starting the mastication, subjects were asked to open their mouth momentarily to have a digital image of their mouth taken. The bolus placement area was measured by processing the digital images, calculated as the number of pixel of bolus area. Area asymmetry index was used for the determination of preferred chewing side (PCS). Oblique sagittal MRI scanning in the closed mouth position was taken to evaluate the articular disc position. In asymptomatic subjects with ADD, a significant predominance of the PCS on the ipsilateral side of ADD was observed during the mastication of hard food. On the contrary, no correlation was found between unilateral ADD and PCS for the soft food. From the results of this study, it is suggested that ADD is the associating factor of PCS for hard food. Therefore, it would be necessary to break down the concept of PCS into at least two categories, one for hard food and one for soft food, considering the mechanical loading on the TMJ.