The influence of the Bis-EMA content on the sorption and solubility of dental composite resins

Abstract

Several factors will have effect dental restorative materials in the oral environment that can affect the longevity of the material. Today dental composite resin-based materials (CRM) used to a major extent. The monomer mixture is of importance in CRMs and efforts are made to improve the materials by changing the monomer content. The present study investigated the effect of an increasing amount of Ethoxylated Bisphenol-A-Dimethacrylate (Bis-EMA) in experimental composite resin-based materials for dental use on the sorption and solubility behavior. Four different polymer mixtures containing Urethane dimethacrylate (UEDMA), Triethyleneglycol dimethacrylate (TEGDMA), Bis-glycidyl-dimethacrylate (Bis-GMA) Bis-EMA were used. The amount of UEDMA and TEGDMA were stable, while the content of Bis-EMA and Bis-GMA varied. For each group, 6 samples of each material were made for the 3 different storage periods (24 H, 7 and 30 days). The procedure was made according to ISO standard (4049:2009). Water sorption and solubility were calculated and statistically analyzed using ANOVA test and Tukey as post hoc (p<0.05). The results showed that water sorption increases with increasing content of Bis-GMA and decreasing content of Bis-EMA. The material containing less Bis-EMA, showed the lowest weight gain after the drying period. That may have a clinical effect on the degradation of the material.