Effect of fluorinated triethylene glycol dimethacrylate on the properties of unfilled, light-cured dental resins

The fluorinated triethylene glycol dimethacrylate (FTEGDMA) was used to imp rove the properties of Bisphenol A glycol dimethacrylate (BisGMA)/triethyle ne glycol dimethacrylate (TEGDMA) based dental resin system. Physical prope rties such as contact angle, polymerization shrinkage and water sorption, t hermal properties such as glass transition temperature, dynamic modulus and thermal expansion, and mechanical properties such as compressive and diame tral tensile strengths of the experimental neat resins and conventional con trols were investigated and compared, using methods described in the text. Results showed that the FTEGDMA modified neat resins exhibited significant less water sorption and lower polymerization shrinkage and the 2,2'-bis(4-m ethacryloxy ethoxy phenyl) propane (BisEMA) also contributed significantly towards reducing water sorption. The resin containing FTEGDMA and BisEMA(10 :90 molar ratio) (or F1E9) showed the highest values in mechanical strength s, due to its higher glass transition temperature (T-g), while the F5E5 (50 :50) showed the least water sorption, based on the results of contact angle tests and water sorption measurements. The F5E5 resin exhibited the highes t dynamic modulus, The F3E7 (30:70) resin showed the lowest polymerization shrinkage.