Effect of muscle deprogrammers on muscle activity of masseter and temporalis muscles using surface electromyography: A randomized crossover clinical study

Abstract

Aim: To investigate the electromyographic activity of masseter and temporalis muscles in full dentate participants after deprogramming with various muscle deprogramming devices (MDDs). Materials and Methods: The current study was a randomized crossover clinical trial. After the screening of 96 individuals, 30 participants were included based on the eligibility criteria. Surface electromyographic (SEMG) activity of masseter and temporalis muscles was analyzed in different clinical conditions: Condition A—at rest without muscle deprogramming, Condition B—after clenching without muscle deprogramming, Condition C—subsequent to 30 min of deprogramming by cotton rolls, Condition D—subsequent to 30 min of deprogramming by Leaf gauge, Condition E—subsequent to 30 min of deprogramming by Lucia jig, Condition F—subsequent to 24 h of deprogramming by Kois deprogrammer. The inter-group comparison was performed using the analysis of variance (ANOVA) test, and the pairwise comparison was done using Bonferroni post hoc test. Results: ANOVA showed a statistical significant difference in the electromyographic activity of masseter and temporalis muscles in tested individuals, subsequent to deprogramming with different MDDs. Between the tested MDDs, the lowest mean muscle activity was reported with the Kois deprogrammer and the highest with cotton rolls, when used for deprogramming. Conclusion: Muscle deprogramming with the Kois deprogrammer presented lowest muscle activity in both masseter and temporalis muscles involving both sides, thus confirming its effectiveness in achieving patient’s centric relation position.