title: The influence of maxillary and mandibular osteoporosis on maximal bite force and thickness of masticatory muscles.
abstract: The aim of this study was to examine the bite force and masseter and temporal muscle thickness in individuals with maxillary and mandibular osteoporosis. 72 individuals were distributed into two equal groups: (1) facial osteoporosis and (2) healthy controls. Bite force on the right and left molar regions was recorded with a dynamometer and the highest value out of three measurements was recorded as the maximal bite force. Muscle thickness was measured with a SonoSite Titan ultrasound scanner. Ultrasound images were obtained of the bilateral masseter and temporal muscles at rest and at maximal voluntary contraction. The means of the measurements in each clinical condition were analyzed with multivariate statistical analysis (SPSS 19.0). Student's t test indicated no significant difference for muscle thickness, but indicated significantly lower bite force values in the osteoporosis group (p>0.05). Lower bite force in individuals with facial bone loss demonstrates functional impact of osteoporosis on the complex physiological stomatognathic system.
authors.affiliation: Department of Morphology, Physiology and Basic Pathology, Ribeirão Preto Dental School, University of São Paulo, Ribeirão Preto, Brazil.
authors.forename: Paulo B
authors.initials: PB
authors.lastname: Vasconcelos
authors.affiliation: Department of Morphology, Physiology and Basic Pathology, Ribeirão Preto Dental School, University of São Paulo, Ribeirão Preto, Brazil.
authors.forename: Luiz G
authors.initials: LG
authors.lastname: de Sousa
authors.affiliation: Department of Morphology, Physiology and Basic Pathology, Ribeirão Preto Dental School, University of São Paulo, Ribeirão Preto, Brazil.
authors.forename: Simone C H
authors.initials: SC
authors.lastname: Regalo
authors.affiliation: Department of Morphology, Physiology and Basic Pathology, Ribeirão Preto Dental School, University of São Paulo, Ribeirão Preto, Brazil.
authors.forename: Carla M
authors.initials: CM
authors.lastname: Santos
authors.affiliation: Department of Morphology, Physiology and Basic Pathology, Ribeirão Preto Dental School, University of São Paulo, Ribeirão Preto, Brazil.
authors.forename: Moara
authors.initials: M
authors.lastname: de Rossi
authors.affiliation: Department of Morphology, Physiology and Basic Pathology, Ribeirão Preto Dental School, University of São Paulo, Ribeirão Preto, Brazil.
authors.forename: Marisa
authors.initials: M
authors.lastname: Semprini
authors.affiliation: Department of Morphology, Physiology and Basic Pathology, Ribeirão Preto Dental School, University of São Paulo, Ribeirão Preto, Brazil.
authors.forename: Priscilla H
authors.initials: PH
authors.lastname: Scalize
authors.affiliation: Department of Morphology, Physiology and Basic Pathology, Ribeirão Preto Dental School, University of São Paulo, Ribeirão Preto, Brazil.
authors.forename: Selma
authors.initials: S
authors.lastname: Siéssere
mesh_terms: D001732:Bite Force; D004576:Electromyography; D006801:Humans; D008336:Mandibular Diseases; D008406:Masseter Muscle; D008410:Masticatory Muscles; D009119:Muscle Contraction; D010024:Osteoporosis; D013703:Temporal Muscle