Assessment for occlusal vertical dimension based on the subjective and objective

基于主客观的咬合垂直尺寸评估

基本信息

批准号：
18390526
负责人：
MORIMOTO Toshifumi
金额：
$ 10.25万
依托单位：
Matsumoto Dental University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2006
资助国家：
日本
起止时间：
2006 至 2007
项目状态：
已结题

项目摘要

Sensory-motor alteration in response to the changes of occulusal vertical dimension (OVD) was investigated in dentate and edentulous subjects. In dentate subjects, the change in OVD was associated with the changes in masticatory muscle activity during clenching and in lip-seal force. During wakefulness, functional and non-functional masticatory muscle activities occurred in association with a possible fluctuation of mandibular position. In edentulous subjects, occlusal conditions were associated with their oral functions. When two dentures with different occlusal heights were used for a monthm, chewing performance was improved for the denture, OVD of which were determined by comfortable zone of OVD compared to the denture with OVD referred to the denture previously used. However, proprioceptive evaluation did not differ for the two dentures. The results of these studies suggest that sensory-motor adaptation to occlusal height requires a certain period after a new OVD was established. T … More he underlying biological basis were investigated in animal models. Jaw muscle activity fluctuates during sleep-wake cycle as well as mandibular positions. In bite-raised guinea pigs, OVD decreased to the normal level. During chewing at a bite-raised period, masticatory muscle activity increased but maximum opened position of the jaw and masticatory rhythm did not altered. When jaw opening range was experimentally limited, lower OVD was established compared to those of non-treated animals. Using neuroanatomical techniques, specific neural connections were found between the cortical masticatory areas and thalamus. These suggest that OVD is strictly controlled for performing adequate oral functions but the change in OVD induces adaptive oral behaviors under central nervous system functions. Taken together, subjective assessment of proprioceptive perception and oromotor functions, in addition to the objective assessment of them, are needed to determine adequate occlusal height for each patient and to evaluate sensory-motor adaptation to the clinically established occlusal vertical dimension. Less

在有齿和无齿受试者中研究了对咬合垂直尺寸（OVD）变化的感觉运动改变。在有齿受试者中，OVD 的变化与咬紧过程中咀嚼肌活动和唇密封力的变化相关。在清醒期间，功能性和非功能性咀嚼肌活动的发生与下颌位置的可能波动有关。在无牙颌受试者中，咬合状况与其口腔相关。当两种不同咬合高度的义齿使用一个月时，与先前使用的义齿相比，OVD的义齿的咀嚼性能有所改善，OVD的舒适区确定了义齿的功能。这些研究的结果表明，在建立新的 OVD 后，感觉运动对咬合高度的适应需要一定的时间。在动物模型中研究了下颌肌肉活动在咬合饲养的豚鼠中的波动以及咬合饲养期间的正常水平。当颌部张开范围受到实验限制时，咀嚼肌活动增加，但颌部最大张开位置和咀嚼节奏没有改变，与未治疗的动物相比，OVD 较低。技术，在皮质咀嚼区和丘脑之间发现了特定的神经连接，这表明 OVD 受到严格控制以执行适当的口腔功能，但 OVD 的变化会诱导中枢神经系统功能下的适应性口腔行为。除了对其进行客观评估之外，还需要充分确定每个患者的咬合高度并评估感觉运动对临床确定的咬合垂直尺寸的适应。