Thermal expansion of visible-light-cured composite resins

Linear coefficients of thermal expansion were measured on seven visible-light-cured composite resins from 0 to 60 degrees C. The values ranged from 29.0 to 83.5 x 10(-6)/degrees C at 37 degrees C. Statistical analysis revealed significant differences among temperature ranges and products and between runs. Significant correlation was not found between the coefficient of thermal expansion and volume fraction of filler particles.