Influence of Inserting Bite Plane on the Position of Mandibular Condyle

咬合平面疗法已被公认为是治疗口颌疾病的有效方法。有很多研究比较了佩戴和不佩戴咬合平面时的肌电图活动，但很少有研究比较这两种情况下的颌骨和髁突运动。为了分析佩戴和不佩戴咬合平面时最大自主咬合时的髁突运动，进行了以下实验。五名无肌肉和颅下颌障碍症状的有齿受试者参加了本实验。每个受试者制作一个内间距为5mm的全弓咬合面。本实验通过对咬合平面咬合面进行磨削，测试了5种类型的咬合接触。用6自由度测量仪记录下颌和髁突在有咬合面和无咬合面时的运动。在不戴咬合平面的情况下，最大自主咬合时，髁突运动0.2 ~ 0.6 mm。佩戴时，咬合面为0.4 ~ 1.7 mm，全弓咬合接触。在全弓咬合平面咬合时，髁突运动程度小于其他类型的咬合平面，与不戴牙合平面的距离更接近。从这些结果，我们得出结论，佩戴全弓咬合平面是治疗一些咬合疾病的有效方法。

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.