Abstract
This study evaluated the effect of organic solvent concentration on the tensile strength for an experimental adhesive resin containing a ternary photoinitiator system. A monomer blend based on the Bis-GMA, TEGDMA and HEMA was used as a model dental adhesive resin. Two photoinitiation systems were used: a binary system camphorquinone (CQ) and ethyl 4-dimethylamine benzoate (EDAB)] and a ternary system CQ, EDAB and diphenyliodonium hexafluorphosphate (DPIHFP)]. Varied ethanol concentrations were added to the resins, viz. 0, 5, 10, 20, 30, 40 wt%. The ultimate tensile strength test was used to investigate the influence of the solvent amount on the resistance of resins. Furthermore, the use of iodonium salt in photoinitiation system increased the cohesive strength when compared with the binary system. Regardless of solvent concentration, the cohesive strength of polymers containing diphenyliodonium was higher than for the binary photoinitiator system.
Highlights
The ultimate tensile strength test was used to investigate the influence of the solvent amount on the resistance of resins
The use of iodonium salt in photoinitiation system increased the cohesive strength when compared with the binary system
Outra vantagem do uso de sais de iodônio como co-iniciadores em adesivos dentais é seu caráter iônico, o que lhe confere a propriedade de miscibilidade em água, o que é de grande interesse para a promoção da polimerização de monômeros polares em adesivos odontológicos, onde o fenômeno da separação de fase pode ocorrer[13]
Summary
Etanol absoluto (Nuclear, São Paulo, SP, Brasil), etil 4-dimetilamino benzoato (EDAB) e difeniliodônio hexafluorfosfato (DPI) – (Aldrich Chemical Co, Milwaukee, WI, EUA), bisfenol A glicidil dimetacrilato (Bis-GMA), trietilenoglicol dimetacrilato (TEGDMA), 2-hidroxietil metacrilato (HEMA) e canforoquinona (CQ) – (Esstech Inc, Essignton, PA, EUA) como recebidos. Uma resina experimental (blenda monomérica) foi preparada através da mistura de 50% de Bis-GMA, 25% TEGDMA e 25% HEMA em massa. Dois sistemas de fotoiniciação foram usados, um sistema binário (1mol% de CQ e 1mol% de EDAB) e um sistema ternário (1mol% de CQ, 1mol% de EDAB e 1mol% de DPI). Para cada sistema de fotoiniciação, diferentes concentrações de etanol absoluto foram adicionadas: 0, 10, 20, 30 e 40% em massa
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