Alteration in directional specificity of interdental dimension discrimination with the degree of mouth opening.
Alteration in directional specificity of interdental dimension discrimination with the degree of mouth opening.
复制标题
齿间尺寸辨别的方向特异性随张口程度的变化。
DOI：
10.1111/j.1365-2842.1983.tb00128.x
复制
发表时间：
1983
影响因子：
2.9
通讯作者：
Y. Kawamura
中科院分区：
文献类型：
--
作者：
T. Morimoto;T. Hamada;Y. Kawamura
在7种不同的张口度下进行牙间尺度辨别(IDD)能力测试：有齿牙组为40 mm、30 mm、20 mm和10 mm，无牙牙组为10 mm、牙尖间隙位置(ICP)和ICP负5 mm。受试者被要求辨别上下门牙之间交替握持的棍子对。根据50%差值阈值(DL)评估的IDD能力，在七个不同开口处进行的任何两个测试之间没有显著差异，尽管齿状齿受试者的误判数量随着张嘴程度的增加而增加。另一方面，IDD的方向特异性是一种高估每对第一棒的尺寸的倾向，其发展几乎是随着开放程度的降低而线性发展的。这些发现表明，相关受体的行为随着颌间距离的不同而不同。一些无牙颌受试者在过度关闭的位置(ICP5 Mm)无法察觉到小试棒的存在，但施加到下颌的振动使受试者能够在相同的开口处检测到试棒。这些结果支持了闭口肌的肌梭是IDD的受体的假设。
The interdental dimension discrimination (IDD) ability was tested at seven different degrees of mouth opening: 40 mm, 30 mm, 20 mm and 10 mm openings for the dentate subjects, and 10 mm opening, intercuspal position (ICP) and the ICP minus 5 mm for the edentulous subjects. The subjects were asked to discriminate between pairs of sticks held alternately between the upper and lower incisors. The IDD ability, evaluated in terms of the 50% difference limen (DL), did not differ significantly between any two of the tests conducted at seven different openings, although the number of misjudgments of the dentate subjects tended to increase with the degree of mouth opening. On the other hand, the directional specificity of the IDD, which is a tendency to overestimate the dimension of the first stick of each pair, developed almost linearly with a decrease in the opening degree. These findings indicate that the behaviour of the receptors concerned varies with the intermaxillary distance. Some edentulous subjects could not perceive the presence of a small test stick at the overclosed position (ICP -5 mm), but vibration applied to the mandible enabled the subjects to detect the stick at the same opening. These results support the assumption that the muscle spindles of the jaw-closing muscles are the receptors responsible for the IDD.