Evaluation of Unilateral Masticatory Muscle Function by Comprehensive Intervention / 中山大学学报(医学科学版)

ABSTRACT

@#【Objective】 To compare the changes of electromyographic activity of masticatory muscles in unilateral chewers before and after comprehensive intervention，and to evaluate the effect of comprehensive intervention.【Methods】 Thirty patients with unilateral mastication were selected，aged（19.3±0.5）years old. There was no statistically significant difference in general conditions ，which met the selection criteria for unilateral mastication. Randomly divided into intervention group and control group，with 15 cases in each group. The control group did not undergo any treatment，and the intervention group was given comprehensive intervention treatment mainly by eliminating inducement and muscle function training. Six months later，the electromyogram of masseter（left：LMM，right：RMM）and anteriovent of digastric muscle（left：LDA，right：RDA） were recorded in the two groups during the maximum opening and closing movement（M1）and masticatory movement（M2）. Statistical analysis was performed for the above.【Results】① There were significant differences in the average electromyographic difference values of LDA［M1：-7.4（-12.98，-1.84）］and RMM［M2：-2.28（- 4.42，- 0.13）］before and after intervention in the intervention group（P < 0.05）；the average EMG values of RMM and RDA in M2 after intervention were 9.62（5.99，9.98），9.96（7.91，12.62），compared with RMM［4.88（3.87~5.88）］，RDA［5.05（3.07~8.12）］in control group，the difference was statistically significant（P < 0.01）. ② The peak electromyogram values of bilateral DA （M1） and MM （M2） in intervention group were higher than those before intervention （P < 0.05）；the peak electromyogram values of LDA（M1）after intervention was 760.24（322.34~953.81），compared with LDA［M1 ：317.41（186.17~474.81）］in the control group，the difference was statistically significant（P < 0.05）.③ The activity asymmetry index of MM and DA in intervention group was lower than that before intervention（P < 0.05）；the value of the MM index［M1（15.59 ± 10.52），M2（10.84 ± 7.35）］after the intervention was lower than that in control group［M（129.89 ± 20.56），M（222.39 ± 16.87）］（P < 0.05），the DA index value［M1：7.60（5.00~26.5）］was lower than that in control group［25.4（13.8~43.50）］（P < 0.05）.【Conclusions】After comprehensive intervention，the contractility and symmetry of masseter and anteriovent of digastric muscle were significantly improved ，and the function of masticatory muscles recovered well.