I Gusti Aju Wahju Ardani and Dwi Rahmawati and Ida Bagus Narmada and Alexander Patera Nugraha and arah Nadia and Haydar Taftazani and Martha Kurnia Kusumawardani (2020) Surface Electromyography Unveil the Relationship between Masticatory Muscle Tone and Maloclusion Class I & II in Javanese Ethnic Patient. Journal of International Dental and Medical Research, 13 (4). pp. 1447-1454. ISSN 1309-100X

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Abstract

Aim to evaluate the difference of masticatory muscle activity of Malocclusion Class I and Class II malocclusion in Javanese ethnic patient detected by surface electromyography (sEMG). Observational analytic cross-sectional study was done. The sample consisted of 16 patients, 18-21 years-old taken by the total sampling. The classification of malocclusion based on Angle’s malocclusion classification then divided into Class I malocclusion (ANB<4º) and Class II Malocclusion group (ANB>4º) based on cephalometric, study models and intra-oral examination (n=8). The cephalometry was traced using the Orthovision™ digital program and then the anatomical points are determined. The measurement of muscle activity was recorded by means of sEMG. Determine the installation of black-red electrodes according to the direction of muscle contraction from origo to insertio. Pairing the electrode pad then parallel to the muscle belly with muscle fibers with a distance of 1 cm between the electrodes and ground plug. Select the feedback mode and sensitivity according to muscle strength. The right and left side of masseter, temporalis, suprahyoid muscles activity was examined. Mann-Whitney analysis (p<0.05) was done based on homogenity and normality data test (p>0.05). Only the right side of temporal muscle activity was significantly different in Class I and Class II malocclusions in Javanese ethnic patient (p=0.0001). Meanwhile, the masseter and suprahyoid muscles right side, have no significant differences were found in Javanese ethnic patient (p=0.99). Therefore, there was no significant different in left side of temporalis (p=0.11), masseter (p=0.99) and suprahyoid (p=0.104) muscle activity between malocclusion class I and II in Javanese ethnic patient. Temporalis, masseter, and suprahyoid muscle activity detected by sEMG have no significant difference in malocclusion Class I and II in Javanese ethnic patients.

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