Influence of Inserting Bite Plane on the Position of Mandibular Condyle

咬合平面疗法已被认为是治疗口腔颌面疾病的有效方法。有许多研究比较了戴咬合面和不戴咬合面时的肌电活动，但很少有研究比较这两种情况下的颌骨和髁突运动。为了分析在最大限度地随意咬合和不戴咬合面的情况下的髁突运动，进行了以下实验。5名没有肌肉和颅颌紊乱症状的齿状突受试者参加了这项实验。为每个受试者制作一个切缝间距为5 mm的全弓咬合面。本实验通过磨削咬合面，对5种类型的咬合接触进行了测试。用6自由度测量仪记录咬合平面与不戴咬合平面时的颌骨和髁突运动，最大咬合时不戴咬合平面时，髁突运动0.2~0.6 mm。配戴咬合面时，牙合接触程度为0.4~1.7 mm，与其他类型咬合面相比，咬合面咬合时的髁突运动程度较小，与不戴咬合面的距离接近，说明戴全牙合面对某些牙合紊乱有一定的治疗作用。

The bite plane therapy has been accepted to be useful for treatment of the patients with stomatognathic disorders. There are many studies comparing EMG activity between with and without wearing a bite plane, but few studies comparing jaw and condylar movements between these two conditions. In order to analyze condylar movements during maximal voluntary clenching with and without wearing bite plane, following experiments were performed.Five dentate subjects who had no signs of muscular and craniomandibular disorders participated in this experiment. A full-arch bite plane with an interincisal distance of 5 mm was fabricated for each subject. 5 types of occlusal contacts were tested in this experiments by grinding the occlusal surface of bite plane. Jaw and condylar movements were recorded with a 6-degree-of-freedom measuring device during with and without bite plane.During maximal voluntary clenching without wearing the bite plane, the condylar movement was 0.2 〜 0.6 mm. When wearing the bite plane, it was 0.4 〜 1.7 mm with full arch occlusal contact.The condylar movements during biting the bite plane with full arch occlusal contacts were smaller degree than during biting other types of the bite planes, and it is more nearly comparable to the distance without wearing bite plane.From these results, we concluded that wearing the full-arch bite plane is useful as a therapy for some cases of occlusal disorders.