EMG pattern of masticatory muscles in altered dentition - Part I

The aim of this study is to reveal how any alteration in occlusion results in functional disturbances in masticatory muscles, which may in turn develop TMJ pain dysfunction syndrome in the long ran. Electromyography (EMG) of masseter and temporalis muscles (if ten adult individuals with normal occlusion and either 36 or 46 carious, was recorded in rest position and during chewing activity of mandible. After cavity preparation, inlay with high point (or occlusal interference) was fabricated, which seas fitted in the tooth and EMG recordings were repeated. Again the same recordings were done after stablishing the occlusal equilibrium. Atypical pattern of muscle activity was observed only in presence of occlusal interference and obolished after removal of the same. This activity resembled the spasm in skeletal muscle. Spasm in masticatory muscles may initiate the symptoms of TMJ pain dysfunction syndrome.