Dentistry – Apparatus – Work support
Reexamination Certificate
2005-07-05
2005-07-05
O'Connor, Cary E. (Department: 3732)
Dentistry
Apparatus
Work support
C433S034000, C433S060000, C433S074000
Reexamination Certificate
active
06913462
ABSTRACT:
A dental prostheses modeling system includes a re-usable tray having in an upper part thereof a trough for receiving a semi-liquid casting material such as plaster of Paris or die stone, the trough having opposed vertical walls in which are formed alternating vertically disposed ribs and grooves for molding complementary shaped grooves and ribs in opposed sides of the base of a dental model casting molded in said tray. The trough has a base frame which overlies an upwardly concave lower cavity for receiving liquid die stone after the casting base has solidified, hardened and been removed. The base frame has therethrough an elongated aperture joining the upper trough to the lower cavity. A resilient insert is removably lodged in the base frame aperture to form therewith a liquid-tight seal, whereupon liquid die stone is poured into the upper trough to form the base of a dental model casting. After the casting has hardened, the insert is removed, and pins are fitted into selected portions of the cast base. The tray is then inverted to receive liquid die stone which hardens to form a stone base matrix for insertably receiving pins protruding from the casting base. The casting is then severed into segments which are releasably re-engageable along with adjacent portions of the casting within the tray, proper registration between segments of the casting being effected by insertable receipt of pins within holes formed in the matrix during hardening thereof, and engagement between ribs and grooves of the casting segment bases with complementarily-shaped grooves and ribs in the inner side walls of the upper tray trough.
REFERENCES:
patent: 6402513 (2002-06-01), Sim
Barnes Richard
Honstein Jerry P.
Siragusa Anthony
Chapin William L.
Dental Ventures of America Inc.
O'Connor Cary E.
Stokes Candice C.
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