title: Dental composites reinforced with hydroxyapatite: mechanical behavior and absorption/elution characteristics.
abstract: The purpose of this study was to analyze the behavior in water as well as the mechanical and surface properties of experimental composites designed for dental restoration. Studied materials were composed of a visible-light-cured monomer mixture as a matrix (bisphenol-alpha-glycidyl methacrylate with triethyleneglycol dimethacrylate or hydroxyethyl methacrylate) and either micrometric or nanometric hydroxyapatite (HA) particles as a reinforcing filler. The surface of the filler particles was modified by using different coupling agents (citric, hydroxysuccinic, acrylic, or methacrylic acid). The hydrolytic stability of the evaluated materials was studied through elution-in-water and water-uptake tests. Mechanical and surface properties were examined through the results of flexural, hardness, and surface roughness tests. Means and standard deviations were calculated for each variable. Analysis of variance and multiple comparison tests were performed. Materials containing bisphenol-alpha-glycidyl methacrylate:triethyleneglycol dimethacrylate and micrometric-HA coated with citrate, acrylate, or methacrylate displayed the most favorable results. Improvements should be obtained by increasing the total filler amount, and by the introduction of nanometric-HA filler into a micrometric-HA reinforced composite resin system.
authors.affiliation: Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus de la UAB, 08193, Bellaterra, Spain. conchi@icmab.es
authors.forename: C
authors.initials: C
authors.lastname: Domingo
authors.forename: R W
authors.initials: RW
authors.lastname: Arcís
authors.forename: A
authors.initials: A
authors.lastname: López-Macipe
authors.forename: R
authors.initials: R
authors.lastname: Osorio
authors.forename: R
authors.initials: R
authors.lastname: Rodríguez-Clemente
authors.forename: J
authors.initials: J
authors.lastname: Murtra
authors.forename: M A
authors.initials: MA
authors.lastname: Fanovich
authors.forename: M
authors.initials: M
authors.lastname: Toledano
mesh_terms: D000042:Absorption / Q000187:drug effects*; D000704:Analysis of Variance; D001672:Biocompatible Materials; D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry; D003764:Dental Materials; D006801:Humans; D006882:Hydroxyapatites / Q000737:chemistry; D008422:Materials Testing / Q000379:methods*; D019563:Mechanics; D008689:Methacrylates / Q000737:chemistry; D011092:Polyethylene Glycols / Q000737:chemistry; D011109:Polymethacrylic Acids / Q000737:chemistry; D013499:Surface Properties; D014867:Water
chemical_list: D001672:Biocompatible Materials; D003764:Dental Materials; D006882:Hydroxyapatites; D008689:Methacrylates; D011109:Polymethacrylic Acids; D014867:Water; C020946:triethylene glycol dimethacrylate; D011092:Polyethylene Glycols; D017438:Bisphenol A-Glycidyl Methacrylate; C005044:hydroxyethyl methacrylate