Assessment for occlusal vertical dimension based on the subjective and objective

研究了有齿和无牙颌受试者感觉-运动变化对隐匿性垂直尺寸(OVD)的影响。在齿状受试者中，OVD的变化与咬合过程中咀嚼肌肉活动和唇封力的变化有关。在清醒状态下，功能性和非功能性咀嚼肌活动与可能的下颌位置波动有关。在无牙列受试者中，咬合状况与他们的口腔功能有关。当两种不同咬合高度的义齿使用一个月时，其咀嚼性能得到改善，其OVD是由OVD的舒适区域确定的，与以前使用的义齿相比，OVD是指有OVD的义齿。然而，两种义齿的本体感觉评价没有差别。这些研究的结果表明，感觉-运动适应咬合高度需要在新的OVD建立后的一段时间内。T…更多的是在动物模型中研究其潜在的生物学基础。下颌肌肉活动在睡眠-觉醒周期和下颌位置都有波动。在咬合饲养的豚鼠中，OVD下降到正常水平。在咬合提升期的咀嚼过程中，咀嚼肌的活动增加，但下巴的最大张开位置和咀嚼节律没有改变。当颌骨张开范围受到实验限制时，与未治疗的动物相比，OVD较低。利用神经解剖学技术，在皮质咀嚼区和丘脑之间发现了特定的神经联系。这些结果表明，OVD被严格控制以完成适当的口腔功能，但OVD的变化诱导了中枢神经系统功能下的适应性口腔行为。综上所述，除了对本体感觉和口腔运动功能的客观评估外，还需要对它们进行主观评估，以确定每个患者合适的咬合高度，并评估感觉-运动对临床建立的咬合垂直维度的适应性。较少

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