Dentistry – Apparatus – Work support
Reexamination Certificate
2007-05-01
2007-05-01
O'Connor, Cary E. (Department: 3732)
Dentistry
Apparatus
Work support
C433S074000, C433S064000, C433S057000
Reexamination Certificate
active
10376375
ABSTRACT:
A dental prostheses modeling system includes a tray having in an upper part thereof a trough for receiving a semi-liquid modeling material or 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 forming complementary shapes in sides of a casting molded in said tray, a base portion of which has in outer walls thereof alternating vertically disposed grooves and ribs, the trough having a frangible base plate which overlies an upwardly concave cavity for receiving liquid die stone after the upper casting has solidified, hardened and been removed, the base plate being broken and removed to uncover an elongated aperture joining the upper trough to the lower cavity enabling the cast to be ejected from the tray, pins fitted into selected portions of the casting base, the casting reinserted into the trough, and the tray inverted to receive liquid die stone which hardens to form a stone base matrix for insertably receiving pins protruding downwardly from portions of the casting, the casting being then removed from the trough in the upper portion of the tray and 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 die stone base during hardening thereof, and engagement between ribs and grooves of the casting segments 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.
O'Connor Cary E.
Stokes Candice C.
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