Degree of conversion, water sorption and solubility of experimental dentin adhesives containing double and triple-photoinitiator systems

• Grant number: 16/12478-0
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Effective date (Start): October 01, 2016
• Effective date (End): September 30, 2017
• Field of knowledge: Health Sciences - Dentistry - Dental Materials
• Principal Investigator: Adilson Yoshio Furuse
• Grantee: Pedro Henrique Magão
• Host Institution: Faculdade de Odontologia de Bauru (FOB). Universidade de São Paulo (USP). Bauru , SP, Brazil

Abstract

The composition of dental adhesives may influence their performance. Different photoinitiators may be used, and type I photoinitiators are cationic and undergo unimolecular dissociation, without a synergist amine, while type II photoinitiators form free radicals by electron exchange with a coiniciador, which is usually an amine. This study aims to characterize experimental adhesives containing CQ/amine (type II/amine synergist); CQ/diphenyl iodonium hexafluorophosphate (Type II/Type I); or CQ/amine/diphenyl iodonium hexafluorophosphate (type II/amine synergist/type I) through analysis of the degree of conversion degree and water sorption and solubility. Adhesives will be manipulated with two monomer mixtures: Bis-GMA, TEGDMA, HEMA, BHT, and ethanol; or Bis-GMA, Bis-EMA, HEMA, BHT, and ethanol. To these compositions will be added CQ / DABE, CQ / iodonium salt or CQ / DABE / iodonium salt. The degree of conversion will be measured by FTIR-ATR and water sorption and solubility will be evaluated with a precision balance. Experimental adhesives will be photoactivated with two devices: LED curing unit with a broad spectrum of the conventional LED curing unit. Data will be analyzed by analysis of variance and possible correlations will be performed by linear and non-linear regression (± = 0.05).