Abstract: A denture having a base capable of giving a user a feeling of stability related to the fitting of the denture in the proper oral cavity position. The denture is made by a process comprising the steps of: applying a pattern model onto a shaping surface of a master model. The pattern model making uneven patterns on a mucosa-fronted surface of the base. Next a flexible thin film covers the shaping surface and the pattern model. Thereafter the flexible film and the shaping surface are brought into close contact by evacuating the space between them and pouring an impression material over the flexible thin film.

Abstract: A casting furnace includes upper and lower chambers, separated by a wall having a pouring path extending therethrough. A crucible is positioned in the upper chamber and a mold is positioned in the lower chamber, both in alignment with the pouring path. A body of casting metal is placed in the crucible and is melted from the top down by an electric arc generated in the upper chamber, the bottom portion of the body of casting metal blocking the pouring path until the casting metal has become molten. Thereafter, the molten casting metal falls by gravity through the pouring path, and into the mold. The arrangement is such that the molten metal requires nothing but the force of gravity to enter the mold cavity.