Masticatory force and electromyographic activity of the mandibular elevators muscles in different rehabilitation treatments.

Abstract

The masticatory function is one of the most complex neuropsychological mechanisms in human motor performance and it depends on several factors, such as bite force, muscle coordination, morphology, and number of teeth in occlusion. Purpose: to evaluate the influence of different rehabilitation treatments such as complete and partial dentures, masticatory forces, and the dynamics of mandibular elevator muscles. Material and Methods: the maximum bite force (force transducer) and electrical activity (superficial electromyography) associated with the masseter and temporal muscles were quantified. These factors were evaluated at rest position and isometric contraction. The data were subjected to descriptive statistics and compared based on the experimental groups, through ANOVA and Tukey’s tests. Results: for bite force, the ANOVA test showed statistical difference between groups and Tukey’s test showed that the force measured in the removable partial dentures group was 44.75% lower than that of the control group, while for complete denture wearers, there was a reduction of 74.4% in bite force in relation to the control group. For electromyographic activity, there was no statistical difference between groups. Pearson’s correlation test (α=5%) showed positive correlation between the variables of bite force and electromyographic activity only for the control group. Conclusion: it was concluded that the loss of dental elements and their replacement with either partial or complete dentures has a great influence on bite force and electromyographic activity of the masseter and temporal muscles.

Effect of four conservative treatment methods on the muscular activity of masseter and temporalis muscles for subjects with temporomandibular joint disc displacement with reduction

“…The previous results reflected the significant effect of the flat splint and anterior repositioning splint in increasing the EMG activities of masseter and temporalis muscles more than that of behavior therapy and low level laser therapy EMG values presents variability due to differences in: electrodes position, muscle anatomy, width of subcutaneous tissue between electrode and muscle, and facial morphology (36,37) . So the differences between this study and others may be due to the difference in the methodology.…”

Evolution of Chewing Force in Geriatric Edentulous Patients

“…19 Peeran et al mention that during the maximum voluntary contraction of the masseter muscle, the force was 231.93 N on the right side and 230.60 N on the left side with old complete dentures and 163.13 N on the right side and 171.73 N on the left side with new complete dentures after 5 months of follow-up. 20,21 The difference between the old and new complete dentures with respect to the activity of the masseter muscle on the right and left sides was 68.8 N and 58.8 N, respectively. Hence, it was inferred from these values that the right-side masseter muscle was more efficient than the left.…”