Electromyographic activity of masticatory muscles in women with osteoporosis

Abstract

The purpose of this study was to analyze the electromyographic (EMG) activity and the maximal molar bite force in women diagnosed with osteoporosis in the maxillary and mandibular regions, considering the habits and conditions that lead to development of generalized skeletal bone loss, including on face bones, can disturb the functional harmony of the stomatognathic system. Twenty-seven women with mandibular and maxillary osteoporosis and 27 healthy controls volunteered to participate in the study. A 5-channel electromyographer was used. Muscle activity was evaluated by means of EMG recordings of the masticatory musculature (masseter and temporalis muscles, bilaterally) during the following clinical conditions: rest (5 s); right and left lateral excursions (5 s); protrusion (5 s); maximal dental clenching on Parafilm™ (4 s) and maximal voluntary contraction (4 s). This latter clinical condition was used as the normalization factor of the sample data. It was observed that individuals with osteoporosis presented greater EMG activity when maintaining mandible posture conditions and less activity during dental clenching and when obtaining maximal molar bite force. It may be concluded that facial osteoporosis can interfere on the patterns of masticatory muscle activation and maximal bite force of the stomatognathic system.

Effect of Radiation on the Performance of the Stomatognathic System – a Pilot Study

“…This finding is a strong indication of muscular hyperactivity, especially when the electrical activity is evaluated at rest. Several authors report that an increased electrical activity of the masseter and temporal muscles can be a sign of temporomandibular and/or muscular dysfunction [19,20].…”

The Role of Electromyography in Temporomandibular Joint Diseases

“…Kaslara uygun bir flekilde elektrodlar›n (11,12,16,17). Elde etti¤imiz EMG kas aktivitelerinde ortalama pik amplitüdü ve/veya ortalama karekök (root mean square) sonuçlar› önemlidir.…”

“…Hatta kraniomandibular bozukluklar›n tedavisinden sonra servikal omurga postüründe, masseter ve sternokleidomastoideus kaslar›n›n elektromyografik aktivitelerinde düzelme oldu¤u göz-lenmifltir (8,12,13,25). Postür d›fl›nda EMG ile yap›lan bir çal›flma-da çenede görülen osteoporozun da kas aktivitelerini etkileyerek çene semptomlar›na yol açt›¤› gösterilmifltir (17). Bunun nedeni olarak da osteoporozun yanak mukozas›nda bulunan reseptör say›s›n› azaltarak afferent impuls say›s›n› azaltmas› ve ard›ndan da kas aktivitesinin etkilendi¤i öne sürülmüfltür.…”

“…Bunun nedeni olarak da osteoporozun yanak mukozas›nda bulunan reseptör say›s›n› azaltarak afferent impuls say›s›n› azaltmas› ve ard›ndan da kas aktivitesinin etkilendi¤i öne sürülmüfltür. Çene kemi¤inde osteoporozu bulunan bireylerin çi¤neme aktiviteleri için daha fazla enerji tüketmeleri gerekti¤i sonucuna var›lm›flt›r (17).…”

“…Özellikle de bu art›fl anterior temporalis kas›nda masseter kas›ndan daha belirgin olarak gözlenmifltir. fiimdiye kadar yap›lm›fl çal›flmalarda s›rayla; myojenik, artrojenik ve mikst tip TMEH'lerde kas aktivite de¤iflikli¤i saptanm›flt›r (13,17). Sonuç olarak TME kaslar›n›n EMG bulgular›nda kas aktivitesi artm›fl veya azalm›fl olsun, e¤er normalden sapma varsa bir stomatognatik sistem disfonksiyonu mevcuttur (17).…”