A STUDY OF WORKING-SIDE INTERFE

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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.