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Type: Artigo
Title: Water sorption of CH3- and CF3-Bis-GMA based resins with additives
Author: Prakki, Anuradha
Cilli, Renato
Vieira, Ian Matos
Dudumas, Kristina
Pereira, José Carlos
Abstract: To evaluate the effect of additives on the water sorption characteristics of Bis-GMA based copolymers and composites containing TEGDMA, CH3Bis-GMA or CF3Bis-GMA. Material and methods: Fifteen experimental copolymers and corresponding composites were prepared combining Bis-GMA and TEGDMA, CH3Bis-GMA or CF3Bis-GMA, with aldehyde or diketone (24 and 32 mol%) totaling 30 groups. For composites, barium aluminosilicate glass and pyrogenic silica was added to comonomer mixtures. Photopolymerization was effected by 0.2 wt% each of camphorquinone and N,N-dimethyl-p-toluidine. Specimen densities in dry and water saturated conditions were obtained by Archimedes' method. Water sorption and desorption were evaluated in a desorption-sorption-desorption cycle. Water uptake (%WU), water desorption (%WD), equilibrium solubility (ES; µg/mm3), swelling (f) and volume increase (%V) were calculated using appropriate equations. Results: All resins with additives had increased %WU and ES. TEGDMA-containing systems presented higher %WU, %WD, ES, f and %V values, followed by resins based on CH3Bis-GMA and CF3Bis-GMA. Conclusions: Aldehyde and diketone led to increases in the water sorption characteristics of experimental resins.
Subject: Resinas compostas
Country: Brasil
Editor: USP/Faculdade de Odontologia de Bauru
Rights: Aberto
Identifier DOI: 10.1590/S1678-77572012000400014
Date Issue: 2012
Appears in Collections:FOP - Artigos e Outros Documentos

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