title: Influence of the base and diluent monomer on network characteristics and mechanical properties of neat resin and composite materials.
abstract: This study evaluated the effect of the combination of two dimethacrylate-based monomers [bisphenol A diglycidyl dimethacrylate (BisGMA) or bisphenol A ethoxylated dimethacrylate (BisEMA)] with diluents either derived from ethylene glycol dimethacrylate (ethylene glycol dimethacrylate, diethylene glycol dimethacrylate, triethylene glycol dimethacrylate, tetraethylene glycol dimethacrylate) or 1,10-decanediol dimethacrylate (D3MA) on network characteristics and mechanical properties of neat resin and composite materials. The degree of conversion, maximum rate of polymerization and water sorption/solubility of unfilled resins and the flexural strength and microhardness of composites (after 24 h storage in water and 3 months storage in a 75 vol% ethanol aqueous solution) were evaluated. Data were analyzed with two-way ANOVA and Tukey's test (α = 0.05). The higher conversion and lower water sorption presented by BisEMA co-polymers resulted in greater resistance to degradation in ethanol compared with BisGMA-based materials. In general, conversion and mechanical properties were optimized with the use of long-chain dimethacrylate derivatives of ethylene glycol. D3MA rendered more hydrophobic materials, but with relatively low conversion and mechanical properties.
authors.affiliation: Department of Biomaterials and Oral Biology, School of Dentistry, University of São Paulo, Av. Professor Lineu Prestes, 2227, Cidade Universitária, São Paulo, SP, 05508-000, Brazil, niveafroes@usp.br.
authors.forename: Nívea Regina de Godoy
authors.initials: NR
authors.lastname: Fróes-Salgado
authors.forename: Vinícius
authors.initials: V
authors.lastname: Gajewski
authors.forename: Bárbara Pick
authors.initials: BP
authors.lastname: Ornaghi
authors.forename: Carmem Silvia Costa
authors.initials: CS
authors.lastname: Pfeifer
authors.forename: Marcia Margarete
authors.initials: MM
authors.lastname: Meier
authors.forename: Tathy Aparecida
authors.initials: TA
authors.lastname: Xavier
authors.forename: Roberto Ruggiero
authors.initials: RR
authors.lastname: Braga
mesh_terms: D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry*; D003188:Composite Resins / Q000737:chemistry*; D003764:Dental Materials / Q000737:chemistry; D055119:Elastic Modulus; D005233:Fatty Alcohols / Q000737:chemistry; D006244:Hardness; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry*; D011092:Polyethylene Glycols / Q000737:chemistry; D058105:Polymerization; D011109:Polymethacrylic Acids / Q000737:chemistry; D012995:Solubility; D013499:Surface Properties
chemical_list: D003188:Composite Resins; D003764:Dental Materials; D005233:Fatty Alcohols; D008689:Methacrylates; D011109:Polymethacrylic Acids; C098758:tetraethyleneglycol dimethacrylate; C020946:triethylene glycol dimethacrylate; D011092:Polyethylene Glycols; C074277:ethoxylated bis-phenol A dimethacrylate; D017438:Bisphenol A-Glycidyl Methacrylate; C118975:1,10-decanediol; C004919:ethylene dimethacrylate
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