title: Solubility, salivary sorption and degree of conversion of dimethacrylate-based polymeric matrixes.
abstract: This study investigated the relationship between the solubility, salivary sorption, and degree of conversion of dimethacrylate-based polymeric matrixes. Six polymeric matrixes produced by mixing bis-GMA, TEGDMA and UDMA dimethacrylate monomers were studied. Photoactivation was induced by camphoroquinone/ethyl N,N-dimethyl-4-aminobenzoate. The specimens were light-cured using an irradiance of 850 mW/cm(2) for 20 s. The solubility and sorption (microg/mm(3)) were measured after immersion in artificial saliva (neutral pH) for 7 days. The degree of conversion (%) was obtained by using a FT-IR spectrometer equipped with an attenuated total reflectance crystal (ATR). The degree of conversion varied from 39.15 +/- 6.30 to 65.57+/- 4.80, and was influenced by the viscosity of the monomers present in the polymeric matrixes. The solubility of polymeric matrixes varied between 13.64 +/- 0.39 and 25.08 +/- 0.83, and was strongly influenced by the degree of conversion (Pearson, r = -0.9587, p < 0.01). No correlation was found between salivary sorption and the degree of conversion (p = 0.3918). Salivary sorption was only dependent on the chemical and physical structures of the monomers presented in the polymeric matrixes.
authors.affiliation: Department of Restorative Dentistry, School of Dentistry, Federal Fluminense University, Niterói, Rio de Janeiro, Brazil.
authors.forename: Luana
authors.initials: L
authors.lastname: Gonçalves
authors.forename: Jaime D N
authors.initials: JD
authors.lastname: Filho
authors.forename: José G A
authors.initials: JG
authors.lastname: Guimarães
authors.forename: Laiza T
authors.initials: LT
authors.lastname: Poskus
authors.forename: Eduardo M
authors.initials: EM
authors.lastname: Silva
mesh_terms: D008422:Materials Testing / Q000379:methods; D008689:Methacrylates / Q000737:chemistry*; D011109:Polymethacrylic Acids / Q000138:chemical synthesis / Q000737:chemistry*; D012463:Saliva / Q000737:chemistry*; D012995:Solubility
chemical_list: D008689:Methacrylates; D011109:Polymethacrylic Acids