Influence of photoinitiator system on physical-chemical properties of experimental self-adhesive composites

Marcus Vinicius Loureiro Bertolo, Rita de Cássia Martins Moraes, Carmem Pfeifer, Vinícius Esteves Salgado, Ana Rosa Costa Correr, Luis Felipe J Schneider

Research output: Contribution to journalArticle

8 Scopus citations

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 (α=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.

Original languageEnglish (US)
Pages (from-to)35-39
Number of pages5
JournalBrazilian Dental Journal
Volume28
Issue number1
DOIs
StatePublished - 2017

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Keywords

  • Adhesion
  • Dental materials
  • Photoinitiator system
  • Resin composite

ASJC Scopus subject areas

  • Dentistry(all)

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