Santosa R E, Azizi M, Whittle T, Wanigaratrne K, Klineberg I J
Jaw Function and Orofacial Pain Research Unit, Faculty of Dentistry, The University of Sydney, Westmead Hospital Centre for Oral Health, Westmead, New South Wales.
Aust Dent J. 2006 Mar;51(1):33-41. doi: 10.1111/j.1834-7819.2006.tb00398.x.
A leaf gauge and an anterior jig may be used to assist the recording of a reproducible jaw position for restorative and prosthodontic treatment. This study investigated possible condylar displacement using an opto-electronic jaw-tracking device and a leaf gauge or anterior jig. The effect of a leaf gauge and anterior jig on jaw muscle electromyography was also examined.
Five healthy adults without symptoms of temporomandibular disorders were selected. Condylar displacement during clenching were recorded simultaneously with electromyographic activity of superior and inferior heads of the lateral pterygoid, anterior and posterior temporalis, masseter, and suprahyoid muscles. Subjects were trained to bite at maximum and half-maximum bite-force using an anterior jig incorporating a force transducer.
No consistent condylar displacement was observed in x, y and z axes between different bite-forces although there was a trend towards superior displacement. Comparison of maximum intercuspal clench and maximum clench on a leaf gauge and an anterior jig produced significant decrease in anterior temporalis activity (p < 0.05), whilst an anterior jig with maximum clench significantly decreased posterior temporalis muscle activity.
Within the limits of this pilot study, no consistent change in condylar position was identified with these appliances.
叶片规和前部定位器可用于辅助记录用于修复和口腔修复治疗的可重复颌位。本研究使用光电颌骨追踪装置以及叶片规或前部定位器，调查髁突可能出现的移位情况。还检查了叶片规和前部定位器对颌面部肌肉肌电图的影响。
选取5名无颞下颌关节紊乱症状的健康成年人。在紧咬过程中，同时记录翼外肌上、下头，颞肌前、后束，咬肌和舌骨上肌群的肌电活动以及髁突移位情况。使用装有力传感器的前部定位器，训练受试者以最大咬合力和半最大咬合力进行咬合。
尽管存在向上移位的趋势，但在不同咬合力下，x、y和z轴均未观察到一致的髁突移位。与最大牙尖交错位紧咬相比，使用叶片规和前部定位器进行最大紧咬时，颞肌前束活动显著降低（p < 0.05），而使用前部定位器进行最大紧咬时，颞肌后束活动显著降低。
在本初步研究的范围内，未发现使用这些器械会导致髁突位置出现一致变化。
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