title: Influence of Photoinitiator System on Physical-Chemical Properties of Experimental Self-Adhesive Composites.
abstract: The aim of this study was to determine the influence of photoinitiator systems on physical-chemical properties of flowable composites. Conventional (CFC), composed by bisphenol-glycidyl dimethacrylate (BisGMA)+triethyleneglycol dimethacrylate (TEGDMA), and self-adhesive (SAFC), composed by BisGMA+TEDGMA+bis{2-(methacryloyloxy) ethyl} phosphate (2MP), flowable composites were developed. Five photoinitiator systems were tested: camphorquinone (CQ), ethyl-4-dimethylaminobenzoate (EDMAB), diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide (TPO), phenylbis (2,4,6-trimethylbenzoyl)phosphine oxide (BAPO), CQ+EDMAB+TPO and CQ+EDMAB+BAPO. A two-peak LED was used; degree of conversion (DC) and the maximum polymerization rate (RPmax) were determined by near infrared spectroscopy. For the yellowing degree a spectrophotometer was used. Water sorption (Wsp) was obtained after 30 days of water storage (n=5). Data were submitted to two-way analysis of variance and Tukey's test (a=0.05). BAPO presented the highest DC and RPmax values for both series. SAFCs presented lower DC and RPmax for CQ+EDMAB-based materials. Greater yellowing was observed for SAFCs compared with CFCs, except for BAPO. Greater Wsp was observed for SAFCs compared with CFCs. The photoinitiator did not influence Wsp for CFCs, but TPO and BAPO presented the highest Wsp in SAFCs. The photoinitiator system affected differently the physical-chemical properties of CFCs and SAFCs.
authors.affiliation: Department of Restorative Dentistry, Dental Materials Area, Piracicaba Dental School, UNICAMP - Universidade Estadual de Campinas, Piracicaba, SP, Brazil.
authors.forename: Marcus Vinicius Loureiro
authors.initials: MV
authors.lastname: Bertolo
authors.affiliation: Dental School, UFF - Universidade Federal Fluminense, Niterói, RJ, Brazil.
authors.forename: Rita de Cássia Martins
authors.initials: RC
authors.lastname: Moraes
authors.affiliation: Department of Biomechanics and Biomaterials, Oregon Health & Science University, Portland, OR, USA.
authors.forename: Carmem
authors.initials: C
authors.lastname: Pfeifer
authors.affiliation: Dental School, UFPel - Universidade Federal de Pelotas, Pelotas, RS, Brazil.|Dental School, UNIVERSO - Universidade Salgado de Oliveira, Niterói, RJ, Brazil.
authors.forename: Vinícius Esteves
authors.initials: VE
authors.lastname: Salgado
authors.affiliation: Nucleus for Dental Biomaterials Research, UVA - Universidade Veiga de Almeida, Rio de Janeiro, RJ, Brazil.
authors.forename: Ana Rosa Costa
authors.initials: AR
authors.lastname: Correr
authors.affiliation: Dental School, UFF - Universidade Federal Fluminense, Niterói, RJ, Brazil.|Nucleus for Dental Biomaterials Research, UVA - Universidade Veiga de Almeida, Rio de Janeiro, RJ, Brazil.
authors.forename: Luis Felipe J
authors.initials: LF
authors.lastname: Schneider
mesh_terms: D003188:Composite Resins / Q000737:chemistry*; D055117:Curing Lights, Dental; D066298:In Vitro Techniques; D058105:Polymerization; D019265:Spectroscopy, Near-Infrared
chemical_list: D003188:Composite Resins