"Given results of this study with regard to full- and partial-coverage mouthguards, we conclude that balanced occlusion or an increase in vertical dimension have little effect on physical performance. In addition, many recent studies on malocclusions inducing inappropriate distributions of occlusal force have reported malocclusion does not always lead to temporomandibular disorders and that its effect on TMD is minimal.42,43 In other words, although malocclusion is disadvantageous in terms of dispersing occlusal force, it does not always cause pathologic change in temporomandibular joints and masticatory muscles, owing to physiological adaptation. "
[Show abstract][Hide abstract] ABSTRACT: The purpose of this study was to estimate the effects of occlusal stability to identify action mechanisms of mouthguards, known to have a modulatory effect on limb muscle function.
This study included 20 male subjects to perform the isokinetic muscle tests and the Wingate anaerobic power test on both knee joints under five closed-mouth conditions: without or with 4 types of mouthguards with thickness of 2 mm based on premolar area: (1) full-coverage, (2) anterior partial-coverage, (3) right posterior partial-coverage, and (4) left posterior partial-coverage. The obtained results were subjected to One-way ANOVA with repeated measures, followed by post hoc test of the contrast method (α=.05).
There was no significant difference between the closed position with and without a full-coverage mouthguard in all variables. However, significant differences were observed between with and without a partial-coverage mouthguard in muscular endurance during extension of the left knee, muscular power and endurance during flexion of the right knee. Additionally, significant differences were found between occlusal states with full- and partial-coverage mouthguards in muscular power and endurance during extension of the left knee.
These findings indicate the elevation of vertical dimension by 2 mm or the inducement of occlusal stability had little effect on isokinetic muscle strength and anaerobic performance, while uneven distribution of occlusal force might have some positive effects.
The journal of advanced prosthodontics 11/2013; 5(4):388-95. DOI:10.4047/jap.2013.5.4.388 · 0.63 Impact Factor
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