title: Evaluation of silent period on masticatory cycles of different muscles in dentate oral contraceptives users and nonusers.
abstract: OBJECTIVE
  The aim of this study was to evaluate the influence of oral contraceptive use on the silent period (SP) of anterior temporal and masseter muscles during the menstrual cycle.
  
  
  METHODS
  Totally, 28 women on reproductive age were selected including 15 nonusers of any hormone and 13 contraceptive users. All patients were dentate without muscular temporomandibular disorders. Electromyography (SP test) of the anterior temporal and masseter muscles was conducted every week during three consecutive menstrual cycles at 1(st) day of menstruation (P1), 7(th) day (P2), 14(th) day (P3) and 21(st) day (P4).
  
  
  RESULTS
  The SP values in the anterior temporal and masseter muscles were measured at both sides. The SP values of the right side (13.49 ms) at P2 were significantly different compared to the left side (12.28 ms). However, there was no significant difference on the interactions among the three factors.
  
  
  CONCLUSIONS
  It can be concluded that the SP values in healthy women in reproductive age may not be influenced by the menstrual cycle with similar results for both muscles.
authors.affiliation: Department of Dental Materials and Prosthodontics, Faculdade de Odontologia de Araçatuba, Araçatuba Dental School, UNESP - Univ Estadual Paulista, São Paulo, Brazil.
authors.forename: Karina Helga Leal
authors.initials: KHL
authors.lastname: Turcio
authors.affiliation: Department of Dental Materials and Prosthodontics, Faculdade de Odontologia de Araçatuba, Araçatuba Dental School, UNESP - Univ Estadual Paulista, São Paulo, Brazil.
authors.forename: Alício Rosalino
authors.initials: AR
authors.lastname: Garcia
authors.affiliation: Department of Dental Materials and Prosthodontics, Faculdade de Odontologia de Araçatuba, Araçatuba Dental School, UNESP - Univ Estadual Paulista, São Paulo, Brazil.
authors.forename: Paulo Renato Junqueira
authors.initials: PRJ
authors.lastname: Zuim
authors.affiliation: Department of Dental Materials and Prosthodontics, Faculdade de Odontologia de Araçatuba, Araçatuba Dental School, UNESP - Univ Estadual Paulista, São Paulo, Brazil.
authors.forename: Amália
authors.initials: A
authors.lastname: Moreno
authors.affiliation: Department of Dental Materials and Prosthodontics, Faculdade de Odontologia de Araçatuba, Araçatuba Dental School, UNESP - Univ Estadual Paulista, São Paulo, Brazil.
authors.forename: Marcelo Coelho
authors.initials: MC
authors.lastname: Goiato
authors.affiliation: Department of Dental Materials and Prosthodontics, Faculdade de Odontologia de Araçatuba, Araçatuba Dental School, UNESP - Univ Estadual Paulista, São Paulo, Brazil.
authors.forename: Aimée Maria
authors.initials: AM
authors.lastname: Guiotti
authors.affiliation: Department of Dental Materials and Prosthodontics, Faculdade de Odontologia de Araçatuba, Araçatuba Dental School, UNESP - Univ Estadual Paulista, São Paulo, Brazil.
authors.forename: Daniela Micheline
authors.initials: DM
authors.lastname: Dos Santos
keywords: Computerized dentistry; electromyography; menstrual cycle; sexual hormones; silent period