DEVELOPMENT OF METHOD FOR DETERMINING MANDIBULAR POSITION IN EDENTULOUS PATIENTS WITH DIFFICULTIES.

确定无牙颌困难患者下颌位置的方法的开发。

• 批准号: 09671989
• 负责人: ABEKURA Hitoshi
• 金额: $ 2.24万
• 依托单位: HIROSHIMA UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09671989/
• 关键词: complete denture; occlusal vertical dimension; mandibular position sense; comfortable zone; cephalometric analysis; electromyogram; bite force

Of the various methods in the assessment of correct vertical jaw relations, the comfortable zone (CZ) and the most comfortable position (MCP) are noteworthy because it utilizes proprioceptive sensations inherent to the subject. It is unknown whether or not the vertical dimension determined by this method is acceptable from a physiological point of view.For evaluation of the MCP in edentulous subjects, the MCP was recorded in ten edentulous subjects and compared with the intercuspal position (ICP) of normal dentulous people by cephalometric analysis. It was found that the MCP was at a lower mandibular position than the ICP because the facial height was markedly reduced with a front-upward rotation of the mandible centering around the condyles. Thus, it has been suggested that the occlusal vertical dimension (OVD) of the MCP in the restored dentition is less than that of the original ICP.Furthermore we evaluated the CZ and MCP from a physiological or functional point of view using bite force and EMG recording measurements. Analysis of the relationship between vertical dimension and bite force or EMG activities of jaw-closing muscles is one of the most important and basic evaluation techniques of stomatognathic function. The MCP does not exist at any specific point, but in the range where the bite force markedly changed with an increase in vertical dimension, compared to the ICP of healthy dentulous subjects. These results suggested that the MCP of edentulous subjects corresponded with the ICP of dentulous subjects from a functional point of view. The condition of healthy dentulous subjects is considered a universal standard. Therefore, the MCP is physiologically acceptable.The OVD of the MCP may be established at a lower vertical dimension after teeth loss, and positioned in a similar functional position as the ICP of healthy subjects.

在评估正确垂直颌关系的各种方法中，舒适区（CZ）和最舒适位置（MCP）值得注意，因为它利用了受试者固有的本体感觉。从生理角度来看，尚不清楚通过该方法确定的垂直尺寸是否可以接受。为了评估无牙颌受试者的 MCP，记录了 10 名无牙颌受试者的 MCP，并通过头影测量分析与正常有牙颌者的牙尖间位置（ICP）进行比较。结果发现，MCP 的下颌位置比 ICP 低，因为随着下颌骨以髁突为中心向前向上旋转，面部高度显着降低。因此，有人认为修复牙列中 MCP 的咬合垂直尺寸 (OVD) 小于原始 ICP 的咬合垂直尺寸 (OVD)。此外，我们使用咬合力和 EMG 记录测量从生理或功能角度评估 CZ 和 MCP。分析垂直尺寸与咬合力或闭颌肌肌电活动的关系是口颌功能最重要、最基本的评价技术之一。 MCP并不存在于任何特定点，而是存在于与健康有牙受试者的ICP相比，咬合力随着垂直尺寸的增加而显着变化的范围内。这些结果表明，从功能角度来看，无牙颌受试者的 MCP 与无牙颌受试者的 ICP 相对应。健康的有牙受试者的状况被认为是一个通用标准。因此，MCP在生理上是可接受的。MCP的OVD可以在牙齿缺失后建立在较低的垂直尺寸上，并且定位在与健康受试者的ICP类似的功能位置。

项目成果

Nakai N: "Composition of the most comfortable position using cephalometric analvsis." Journal of Oral Rehabilitation. 25・5. 370-375 (1998)

Nakai N：“使用头影测量分析的最舒适位置的构成。”口腔康复杂志 25・5（1998）。

Nakai N: "Composition of the most comfortable position using cephalometric analysis." Journal of Oral Rehabilitation. 25・5. 370-375 (1998)

Nakai N：“使用头影测量分析的最舒适位置的构成。”口腔康复杂志 25・5（1998）。