title: Water sorption, hardness and scanning electron microscopy evaluation of dental composite resins submitted to high-risk decay model and intensive treatment with fluoride.
abstract: The aim of this study is to assess through microhardness test, sorption test and morphological analysis, the behavior of composite resin submitted to the influence of pH cycling model and/or topic application of fluoride gels. Samples of microhybrid Z100 (3M), Estelite sigma (J Morita) and nanoparticulated Filtek Supreme (3M) composite resins were made. The Digital Scale and Vickers Digital Microhardmeter were employed to verify the water sorption and superficial microhardness, respectively. Samples were submitted to acid challenge and topical fluoride gel application. Other samples were made for the morphological analysis. The resin surface morphology in each phase of this experimental study was observed using scanning electron microscopy (SEM). The ANOVA two-way, ANOVA split plot and Tukey statistical tests were used for the statistical analysis. It was concluded that the type of composite resin can influence the water sorption, microhardness and the degree of morphologic alteration, when submitted to different experimental conditions.
authors.affiliation: Departament of Restorative Dentistry, University Center of Maranhão UNICEUMA, São Luis, MA, Brazil. firoozmand@gmail.com
authors.forename: Leily M
authors.initials: LM
authors.lastname: Firoozmand
authors.forename: Maria Amélia M
authors.initials: MA
authors.lastname: de Araujo
mesh_terms: D003188:Composite Resins; D005459:Fluorides / Q000008:administration & dosage*; D006244:Hardness; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D013499:Surface Properties; D014867:Water
chemical_list: D003188:Composite Resins; D014867:Water; D005459:Fluorides