The Effect of Mouthrinses on Resin Composite fillings
This in vitro study evaluated the effect of mouth rinses on salivary sorption (Sp), solubility (Sl) and surface degradation of a nanofilled (Z350, 3M ESPE) and hybrid (P60, 3M ESPE) resin composite. Specimens (6 mm in diameter and 1 mm thick) of a nanofilled and hybrid resin composite were immersed in artificial saliva at 37°C for seven days. Twice a day, the samples (n=5) were immersed in 20 ml of three mouth rinses: Listerine, Plax Mint and Plax. A control group was maintained in artificial saliva. Salivary sorption and solubility were evaluated based on ISO test 4049:2000(E) and surface degradation by scanning electron microscopy–SEM. The degree of conversion (DC%) of resin composites was obtained by using an FT-IR spectrometer equipped with an attenuated total reflectance crystal (ATR). The data were analyzed using the Student's t-test, ANOVA and Tukey test for multiple comparisons.
No significant difference in DC% was found between the two resin composites (p<0.05). The highest sorption rate was presented by the nanofilled composite exposed to Listerine (p<0.05). The hybrid composite in the control group (artificial saliva) and Plax presented the lowest sorption (p<0.05). The highest solubility was presented by the two resin composites exposed to Listerine (p<0.05). SEM analysis showed that mouth rinses produced more severe surface degradation in the nanofilled composite.
The use of alcohol-containing mouth rinses with a low pH may increase the sorption and solubility of resin composites. The nanofilled resin composite underwent more surface degradation than the hybrid type.
Reference:
G. S. Almeida, L. T. Poskus, J. G. A. Guimarães, E. Mda Silva (2010) The Effect of Mouthrinses on Salivary Sorption, Solubility and Surface Degradation of a Nanofilled and a Hybrid Resin Composite. Operative Dentistry: Vol. 35, No. 1, pp. 105-111.
