Electromyographic activity of masticatory muscles in women with osteoporosis.
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.
Siéssere
Selma
S
University of São Paulo, Ribeirão Preto, SP, Brazil. selmas@forp.usp.br
Sousa
Luiz Gustavo de
LG
Lima
Naira de Albuquerque
Nde A
Semprini
Marisa
M
Vasconcelos
Paulo Batista de
PB
Watanabe
Plauto Christopher Aranha
PC
Rancan
Sandra Valéria
SV
Regalo
Simone Cecilio Hallak
SC
D000368:Aged; D001732:Bite Force; D016022:Case-Control Studies; D015331:Cohort Studies; D003766:Dental Occlusion; D004576:Electromyography; D005260:Female; D007839:Functional Laterality; D006801:Humans; D008336:Mandibular Diseases / Q000150:complications / Q000473:pathology / Q000503:physiopathology*; D008410:Masticatory Muscles / Q000503:physiopathology*; D016555:Matched-Pair Analysis; D008439:Maxillary Diseases / Q000150:complications / Q000473:pathology / Q000503:physiopathology*; D008875:Middle Aged; D009119:Muscle Contraction / Q000502:physiology; D010024:Osteoporosis / Q000150:complications* / Q000473:pathology / Q000503:physiopathology; D012016:Reference Values