Abstract
The purposes of this study were to develop model materials for microwave polymerization and to evaluate the relation between the newly-developed model material and the adaptability of resin base dentures. Addition of aluminum powder at a concentration of more than 10wt% to the dental stone resulted affect the heating by microwave irradiation. When the aluminum powder was added to the model materials and to the investing plaster in the lower half of a FRP flask, the difference in temperature between the stone cast and the investing plaster in the upper half of the flask was increased by microwave heating and it became feasible to heat from the tissue side of the denture base. By the use of the newly-developed model materials and investing plaster, containing 20 and 30wt% aluminum powder, respectively, the adaptability of the resin base denture polymerized by microwave heating for 150 sec was by 20〜50% greater than that of denture made of conventional model materials and investing plaster.
