title: Water sorption of heat-polymerized acrylic resins processed in mono and bimaxillary flasks.
abstract: This study evaluated water sorption in heat-polymerized acrylic resins processed in monomaxillary flasks by water bath and in bimaxillary flasks by microwave energy and water bath. Fifty heat-polymerized acrylic resin specimens were fabricated according to the 12th specification of the American Dental Association and assigned to 3 groups: group 1 was processed by water bath in monomaxillary metallic flask; group 2 was processed by microwave energy in bimaxillary PVC flask; and group 3 was processed by water bath in bimaxillary metallic flask. Specimens were submitted to water sorption test, means were calculated and analyzed statistically by Student's t-test. Means (in g/cm3) were: group 1--0.024085, group 2--0.025312 and group 3--0.022098. Microwave energy processing and the amount of stone and resin used in the bimaxillary PVC flask did not influence water sorption; specimens processed in bimaxillary metallic flask by water bath presented lower water sorption means, suggesting an inadequate polymerization of the acrylic resin mass.
authors.affiliation: Department of Prosthesis and Periodontology, Faculty of Dentistry of Piracicaba, State University of Campinas, Piracicaba, SP, Brazil.
authors.forename: Carolina B
authors.initials: CB
authors.lastname: Meloto
authors.forename: Laís R
authors.initials: LR
authors.lastname: Silva-Concílio
authors.forename: Cristiane
authors.initials: C
authors.lastname: Machado
authors.forename: Margarete C
authors.initials: MC
authors.lastname: Ribeiro
authors.forename: Fábio A
authors.initials: FA
authors.lastname: Joia
authors.forename: Célia M
authors.initials: CM
authors.lastname: Rizzatti-Barbosa
mesh_terms: D000042:Absorption; D000180:Acrylic Resins / Q000737:chemistry*; D000327:Adsorption; D003764:Dental Materials / Q000737:chemistry*; D008872:Microwaves; D014867:Water / Q000737:chemistry*
chemical_list: D000180:Acrylic Resins; D003764:Dental Materials; D014867:Water