PREPARATION METHOD OF CERAMIC CROWNS FOR PRIMARY TEETH, AND CERAMIC CROWNS FOR PRIMARY TEETH PREPARED THEREBY

摘要

The present invention relates to a preparation method of ceramic crowns for primary teeth comprising the following steps: mixing raw materials comprising zirconia or alumina forming the frame of a crown for primary teeth, a polymer for providing ductility by lowering viscosity in case of injection molding, and a toner for providing a color identical to or similar to that of primary teeth; heating the mixture so as to allow the polymer contained in the mixed raw materials to have ductility; injection molding the heated raw materials; extracting polymers from the injection molded product so as to reduce brittleness and to provide ductility; debinding the injection molded product to completely remove a polymer component from the injection molded product from which some polymers are removed by the polymer extraction; sintering the debinded product from which polymers are removed, to improve mechanical properties; and barreling the sintered body to provide gloss and to remove burr by polishing the outer surface of the sintered body, and ceramic crowns for primary teeth prepared thereby. According to the present invention, the use of zirconia or alumina having high strength and ductility as a raw material provides aesthetic excellence and high biocompatibility, the use of injection molding enables easy preparation and mass production, thereby lowering manufacturing costs, and the low cost enables wide application as crowns for primary teeth for prosthetics for children.