DENTAL CAST TRAY ASSEMBLY

摘要

In one embodiment of the present invention, a dental cast tray assembly used to form a dental cast model comprises a base (13), and a tray (15) removably mounted on the base. The base includes a top surface (17), a flat bottom surface (19), a front wall (21), a rear wall (23), and a plurality of projections (29) formed on its top surface in a non-recurring, random pattern. Each of the plurality of projections is generally cylindrically shaped, and includes a convex free end. The tray includes a top surface (33) adapted to support the dental cast model, a flat bottom surface (35), a front wall (32), a rear wall (39), a retention bar (41) formed on its top surface and a plurality of openings (43) formed in its bottom surface in the same non-recurring, random pattern in which the plurality of projections are disposed on the base. Each of the plurality of openings is defined by four sidewalls, and is generally hourglass shaped in lateral cross section. Two of the four sidewalls which define each of the plurality of openings include an elongated rib.