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Type: Artigo de periódico
Title: Water sorption of CH3- and CF3-Bis-GMA based resins with additives
Author: Prakki, Anuradha
Cilli, Renato
Vieira, Ian Matos
Dudumas, Kristina
Pereira, Jose Carlos
Abstract: Objectives: To evaluate the effect of additives on the water sorption characteristics of Bis-GMA based copolymers and composites containing TEGDMA, CH(3)Bis-GMA or CF(3)Bis-GMA. Material and methods: Fifteen experimental copolymers and corresponding composites were prepared combining Bis-GMA and TEGDMA, CH(3)Bis-GMA or CF(3)Bis-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; mu g/mm(3)), 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 CH(3)Bis-GMA and CF(3)Bis-GMA. Conclusions: Aldehyde and diketone led to increases in the water sorption characteristics of experimental resins.
Subject: Water storage
Bis-GMA polymer
Composite resins
Country: Brazil
Editor: Univ Sao Paulo Fac Odontologia Bauru
Citation: Journal of Applied Oral Science. Univ Sao Paulo Fac Odontologia Bauru, v.20, n.4, p.472-477, 2012
Rights: fechado
Date Issue: 2012
Appears in Collections:FOP - Artigos e Outros Documentos

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