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Water sorption of CH3- and CF3-Bis-GMA based resins with additives
Anuradha Prakki1, Renato Cilli, Ian Matos Vieira
1Department of Clinical Sciences, Restorative Dentistry, Faculty of Dentistry, University of Toronto, Toronto, Canada. anuradha.prakki@dentistry.utoronto.ca
Objectives:
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.
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