A new device for measuring the stress of upper and lower lips Clinical application

一种新型上下唇应力测量装置的临床应用

• 批准号: 05671715
• 负责人: TAMARI Kazuhiko
• 金额: $ 1.34万
• 依托单位: Kyushu University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1993
• 资助国家: 日本
• 起止时间: 1993 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05671715/
• 关键词: strength of the lip; maximum muscle strength; morphology of the maxillo-facial complex; force gauge

To investigate the relation between the function of lips and morphology of both jaws, we have developed a simple device that allows measurement of lip pressure.A metal plate is inserted under the lip, and pulled outward. The subject is asked to apply force to prevent the release of the plate. The resistance force is considered as the maximum lip strength and is measured for both lips separately. The plate is connected to a force gauge, and the signal is input into a portable computer.The ordinary strength can usually be calculated from the maximum muscle strength (ordinary strength 20-30% of the maximum strength), besides there is a close relation between morphology and strength (maximum strength is proportional to the cross-sectional area). As lips are not thougth to be isolated or completely independent organs, they are believed to influence at least on the anterior part of the maxillo-facial complex. Based on this idea, we conducted a study on 24 subjects to cxamine the relation between the maximum strength of both lips, and the maxillo-facial complex. The hard tissue was evaluated on cephalograms, and the soft tissue were evaluated on photographs.The lower lip showed stronger correlation to the morphology of the maxillo-facial complex more than the upper lip did. In skeletal patterns, the coefficient correlation between the lower lip and ANB was r=-0.427, for A-B plane it was r=0.460. In dental patterns the coefficient correlation for U-1 to SN r=0.398, for L-1 to SN it was r=0.313. As to the soft tissue, the coefficient correlation between the lower lip and the lower face was r=0.463. The coefficient correlation between the maximum strength of both lips was r=0.418.It is therefore concluded that, the mandible has a tendency to develop in all direction in people with high maximum strength of the lower lip.

为了研究嘴唇功能和双颌形态之间的关系，我们开发了一种简单的测量嘴唇压力的装置。在嘴唇下面插入一个金属板，然后向外拉。受试者被要求施加力以防止板的释放。阻力被认为是嘴唇的最大强度，并分别测量两个嘴唇。板材与测力计相连，信号输入便携式计算机，通常由最大肌力(普通肌力为最大肌力的20%-30%)计算出普通肌力，而且形态与肌力有密切关系(最大肌力与横截面积成正比)。由于嘴唇不被认为是孤立的或完全独立的器官，它们被认为至少对颌面部复合体的前部产生影响。基于这一想法，我们对24名受试者进行了一项研究，以探讨双唇最大强度与颌面部复合体的关系。在头影面片上对硬组织进行评价，在照片上对软组织进行评价。下唇与颌面部复合体形态的相关性比上唇更强。在骨骼类型中，下唇与ANB的相关系数为r=-0.427，对于A-B平面，相关系数为r=0.460。在牙型中，U-1与SN的相关系数r=0.398，L-1与SN的相关系数r=0.313。软组织方面，下唇与下面部的相关系数r=0.463。双唇最大强度之间的相关系数为r=0.418。因此，下唇最大强度高的人群下颌骨有向各个方向发展的趋势。