An Electromyographic Study of Gum Chewing in Skeletal Class III Cases Corrected by Orthognathic Surgery. For Subjects Over 4-Year Follow-up.:For Subjects Over 4-Year Follow-up

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This study was an electromyographic investigation of gum chewing in skeletal Class III cases corrected by orthognathic surgery. Electromyograms revealed that gum chewing patterns of the skeletal Class III cases were obviously different from subjects with normal occlusion. In gum chewing of Class III patients, duration and cycle time of the temporal muscle on the chewing side were significantly long and duration/cycle time was statistically short in comparison with normal individuals. All coefficients of variation of duration, interval, cycle time and duration/cycle time were distinctly longer in Class III patients than in controls. Class III patients showed disordered masticating rhythm in gum chewing in comparison with controls. Maximum peak electromyographical frequency of the power spectrum on the chewing side was significantly smaller in both of temporal and masseter muscles in Class III patients than in subjects with normal occlusion. All of these abnormal findings were corrected, following orthognathic surgeries, to values close to normal. However, one year follow-up was insufficient to obtain the results and comparatively long-term follow-up was necessary.
特定非営利活動法人日本口腔科学会の論文