Water sorption characteristics of restorative dental composites immersed in acidic drinks
Dental Materials
Volume 28, Issue 6 , Pages e63-e70, June 2012
Volume 28, Issue 6 , Pages e63-e70, June 2012
Abstract
Objectives
To determine the diffusion coefficient, water sorption and solubility of various types of restorative dental composites and to evaluate the effect of acidic media (orange juice and coke) on their characteristics.Methods
Resin composite specimens (Filtek™ Z350, Spectrum® TPH®3 and Durafill® VS) were prepared in a stainless steel mold of 1
mm thickness and 10mm diameter (n=5) and light-cured. All samples were dried at 37°C, immersed in media (distilled water, orange and coke) at 37°C and weighed at suitable time intervals (15, 35, 155, 320, 785, etc.min) until 40 days of immersion and then were dried again for 40 days. Diffusion coefficient (m2s−1) was determined according to Fick's second law while water sorption and solubility (μg/mm3)
were calculated based on BS EN ISO 4049:2000. Data of water sorption
and solubility were analyzed with One-Way ANOVA and post hoc Scheffe
test at p=0.05.
mm thickness and 10mm diameter (n=5) and light-cured. All samples were dried at 37°C, immersed in media (distilled water, orange and coke) at 37°C and weighed at suitable time intervals (15, 35, 155, 320, 785, etc.min) until 40 days of immersion and then were dried again for 40 days. Diffusion coefficient (m2s−1) was determined according to Fick's second law while water sorption and solubility (μg/mm3)
were calculated based on BS EN ISO 4049:2000. Data of water sorption
and solubility were analyzed with One-Way ANOVA and post hoc Scheffe
test at p=0.05.Results
The
experimental data obtained were obeyed and nearly fitted to the
diffusion theoretical data plot. The highest values of diffusion
coefficients were presented by Durafill® VS (32.23–45.25×10−13m2s−1). Diffusion coefficients of Filtek™ Z350 and Spectrum® TPH®3
were the highest when immersed in coke media followed by distilled
water and orange juice. The water sorption of most composites was
significantly increased after immersion in coke and orange (p<0.05). Meanwhile only Spectrum® TPH®3
showed an increase in solubility when immersed in coke media. Z350
presented the highest water sorption after immersion in distilled water
and coke (16.13 and 18.22μg/mm3) while Durafill® VS presented the highest solubility (7.20–9.27μg/mm3).
×10−13m2s−1). Diffusion coefficients of Filtek™ Z350 and Spectrum® TPH®3
were the highest when immersed in coke media followed by distilled
water and orange juice. The water sorption of most composites was
significantly increased after immersion in coke and orange (p<0.05). Meanwhile only Spectrum® TPH®3
showed an increase in solubility when immersed in coke media. Z350
presented the highest water sorption after immersion in distilled water
and coke (16.13 and 18.22μg/mm3) while Durafill® VS presented the highest solubility (7.20–9.27μg/mm3).
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