Development of surface coating material for discolored tooth equipped with bleaching effect

It is attempted to augment a coating resin with a bleaching effect to provide both short- and long-term whitening effects. Base resin containing sodium percarbonate (SPC) effectively bleached bovine teeth discolored by the Mail lard reaction. SPC did not reduce Vickers hardness, but hardness in the hybrid material increased. The shear bonding strength of SPC-containing resin was low. No inflammation was apparent in hamster cheek pouch mucosa when exposed to SPC resin covered with a layer of base resin. H2O2 was released into buffer from this resin, but when placed onto tooth tissue with a protective layer of base resin, penetration of H2O2 into the pulp chamber was undetectable. It is concluded that SPC resin equipped with a bleaching aid can be safely used as a coating material for discolored teeth.