A micro-particle filler of cross-linked polymer was prepared, to make a one-paste type crown-bridge resin. It is difficult to make the micor particle filler using suspension polymerization, because of the high viscosity of dimethacrylate. When benzoylperoxide and N, N-dimethyl-p-toluidine were added to the ethanol solution involviong dimethacrylate, solution polymerization occurred at room temperature and the micro-particles were precipitated. The effect of amount of dimethacrylate in ethanol solution on the time to start the precipitation of polymer was investigated. The inverse number of the time increased in proportion to amount of monomer. A trial resin was prepared using a mixing filler between the cross-linked polymer particle the diameter of which was 0.5μm and the micro silica particle and the abrasion test was done. The abrasion loss was low when the mixing filler was applied as a filler.