A STUDY OF WORKING-SIDE INTERFE

本文研究了实验性眼动不一致对咀嚼肌活动的影响。制作了专门设计的眼动干涉仪，模拟了不同的眼动状态，测量了受试者的偏心夹持力和咀嚼肌及颞肌前后肌的肌电活动。介绍了一种实验性非眼动不一致对咀嚼肌活动的影响。工作侧干扰引起颞肌前、后肌活动模式的改变，与自然状态下比较，工作侧明显占优势的单侧活动模式改变为双侧活动模式，而大质量肌的活动模式保持不变，双侧活动异常被认为是导致工作侧髁突运动优势和非工作侧髁突运动劣势的原因。工作侧干扰在功能旁夹持期间激发颞肌中的特定肌肉活动，并且可能影响颞下颌关节处的作用力分布。

THE INFLUENCE OF THE EXPERIMENTAL OCCLUSAL DISCREPANCY ON MASTICATORY MUSCLE ACTIVITY WAS INVESTIGATED ON TWELVE SUBJECTS.SPECIALLY DESIGNED OCCLUSAL INTERFERENCES WERE FABRICATED AND VARIOUS OCCLUSAL STATES WERE SIMULATED WITH THE AID OF THEM.SUBJECTS WERE ASKED TO CARRY OUT ECCENTRIC CLENCHING EFFORTS AND ELECTORMYOGRAPHIC ACTIVITY OF THE MASSETER AND THE ANTERIOR AND POSTERIOR TEMPORAL MUSCLES WAS MEASURED.THE INTRODUCTION OF AN EXPERIMENTAL NON-WORKING SIDE INTERFERENCE CAUSED AN ALTERATION OF ACTIVITY PATTERN IN THE ANTERIOR AND POSTERIOR TEMPORAL MUSCLES.WHEN COMPARED TO THE NATURAL UNALTERED CONDITION, A UNILATERAL ACTIVITY PATTERN WITH CLEAR DOMINANCE ON THE WORKING SIDE WAS ALTERED TO A BILATERAL PATTERN.WHILE THAT OF THE MASSETER MUSCLES REMAINED UNINFLUENCED, RESULTANT BILATERAL ACTIVITY IS THOUGHT TO CAUSE A SUPERIOR MOVEMENT OF THE WORKING SIDE CONDYLE AND AN INFERIOR MOVEMENT OF THE NON-WORKING SIDE CONDYLE.THE RESULT OF THIS STUDY SUGGESTS THAT THE NON-WORKING SIDE INTERFERENCE PROVOKES SPECIFIC MUSCLE ACTIVITY IN THE TEMPORAL MUSCLES DURING PARAFUNCTIONAL CLENCHING AND THAT IT MAY AFFECT THE DISTRIBUTION OF THE APPLIED FORCES AT THE TEMPOROMANDIBULAR JOINTS.