Abstract
The apparatus was designed to measure the linear shrinkage of composite resin during hardening, and the linear shrinkage of composite resin against the direction of the length was investigated as a function of filler content in the composite resin using the apparatus.The linear shrinkage of composite resin in low filler content was very small, compared with the linear shrinkage value calculated from the density of monomer, polymer and silica filler, because the viscosity of resin paste was very low and the flow of the resin past during hardening occurred.However, when the filler content become higher, the linear shrinkage was close to the calculated linear shrinkage because the flow of resin past was small, the shrinkage was equally done against the three direction.
