Abstract
Objective: To comparatively assess electromyographic (EMG) activity of masseter muscle and maximum bite force among various facial divergence pattern. To compare bilateral variation therefore derive the clinical importance changes in masseter EMG activity. Materials and Methods: The sample size comprised of 90 subjects, age ranging from 16-25 years. They were further classified under three subgroups-normodivergent, hypodivergent and hyperdivergennt based on the cephalometric values. Tekscan Flexiforce B201H sensor along with the associated software was used to record the bite force. The EMG of the superficial masseter muscle was recorded using Biotech Neurocare 2000 surface electromyography machine. The muscle activity was recorded bilaterally from the superficial masseter. The data obtained were statistically analyzed using ROC curve at p<0.05. Results: The bite force of the Hypodivergent group (571.83N±36.65) was more than the Normodivergent (387.26±27.20) and Hyperdivergent groups (373.21N±29.23). The EMG recording of masseter muscle activity in Hypodivergent group was significantly higher than Normodivergent and Hyperdivergent groups. (p-value= <0.01). A significant correlation existed between masseter activity and bite force. Conclusion: The bite force of Hypodivergent jaw base individuals is highest followed by Normodivergent and least in Hyperdivergent individuals.The strong correlation between the muscular activity and the bite force is definitely a contributor to the anchorage value during treatment by fixed Orthodontics.
Highlights
The EMG activity of superficial masseter muscle can be influenced by factors like age, sex, facial morphology, connective tissue thickness, stress and pain.[8,9,10,11]
As the analysis of bite force and the EMG activity of masseter muscle is a useful indicator of the functional state of the masticatory system and the loading patterns of the teeth, it was a parameter chosen for the study
The maximum bite force in hypodivergent group was more than normodivergent and hyperdivergent groups, which is in concordance to the findings of Ringqvist[12] and Profit et al.[13]
Summary
Correlation between masseter muscle activity and maximum bite force among various facial divergence pattern. Maximum bite force has an influence on the masticatory rin muscle activity and the function of the masticatory system.[1,2,3] Since divergence pattern has muscular variation which influences the facial morphology, bite p force can differ in different individuals.
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