Electromyographic study on the effect of muscle advancement in vestibuloplasty operation

ABSTRACT

In recent years there has been a new wave of interest with new publication on the electromyography of mandibular muscles. Reviewing the litrature of this region gives very limited light of the true function of the muscle of the mandible after advancement, muscle cutting and repositing in vestibuloplasty operation. The aim of this is to study the effect of muscle advancement and repositing by E.M.G. in different techniques of vestibuloplasty. Thirty patients were selected from the department or oral surgery, Faculty of Dentistry, Alexandria University. They were divided into 3 groups A, B and C. Different operative procedures were carried out. E.M.G. study was performed pre and postoperative for the mentalis and buccinato muscles at various degrees of jaw separation, rest, submaximal and on volition. The healing process in group A was faster than other groups. Also the time consumed to perform operation was much less in group A. There was spontaneous recovery in the group of muscle advancement within 2 weeks after transient loss of function with neuropraxia of its nerve without real degeneration. This could be explained by nerve fatigue and associated oedema of the wound. Partial degeneration of the other two groups-has occured with maximal recovery and regeneration within one mouth [muscle cutting and repositioning]. It was observed that the least time of operation the more rapid spontaneous recovery and regeneration and this could be explained by the minimal manipulation that leads to minimal oedema, least trauma and least fatigue of the nerve and rapid healing with maximal recovery