title: Masticatory process in individuals with maxillary and mandibular osteoporosis: electromyographic analysis.
abstract: The masseter and temporal muscles of patients with maxillary and mandibular osteoporosis were submitted to electromyographic analysis and compared with a control group. In conclusion, individuals with osteoporosis did not show significantly lower masticatory cycle performance and efficiency compared to the control group during the proposal mastications.
  
  
  BACKGROUND
  This study aimed to examine electromyographically the masseter and temporal muscles of patients with maxillary and mandibular osteoporosis and compare these patients with control patients.
  
  
  METHODS
  Sixty individuals of both genders with an average age of 53.0 +/- 5 years took part in the study, distributed in two groups with 30 individuals each: (1) individuals with osteoporosis; (2) control patients during the habitual and non-habitual mastication. The electromyographic apparel used was a Myosystem-BR1-DataHomins Technology Ltda., with five channels of acquisition and electrodes active differentials. Statistical analysis of the results was performed using SPSS version 15.0 (Chicago, IL, USA).
  
  
  RESULTS
  The result of the Student's t test indicated no significant differences (p > 0.05) between the normalized values of the ensemble average obtained in masticatory cycles in both groups.
  
  
  CONCLUSIONS
  Based on the results of this study, it was concluded that individuals with osteoporosis did not show significantly lower masticatory cycle performance and efficiency compared to control subjects during the habitual and non-habitual mastications. This result is very important because it demonstrates the functionality of the complex physiological process of mastication in individuals with osteoporosis at the bones that compose the face.
authors.affiliation: Faculty of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, São Paulo, Brazil. selmas@forp.usp.br
authors.forename: S
authors.initials: S
authors.lastname: Siéssere
authors.forename: N
authors.initials: N
authors.lastname: de Albuquerque Lima
authors.forename: M
authors.initials: M
authors.lastname: Semprini
authors.forename: L G
authors.initials: LG
authors.lastname: de Sousa
authors.forename: J
authors.initials: J
authors.lastname: Paulo Mardegan Issa
authors.forename: S
authors.initials: S
authors.lastname: Aparecida Caldeira Monteiro
authors.forename: S
authors.initials: S
authors.lastname: Cecílio Hallak Regalo
mesh_terms: D000368:Aged; D016022:Case-Control Studies; D004576:Electromyography; D005260:Female; D006801:Humans; D008297:Male; D008334:Mandible / Q000503:physiopathology*; D008406:Masseter Muscle / Q000503:physiopathology; D008409:Mastication / Q000502:physiology*; D008437:Maxilla / Q000503:physiopathology*; D008875:Middle Aged; D010024:Osteoporosis / Q000503:physiopathology*; D013703:Temporal Muscle / Q000503:physiopathology