Dentistry – Prosthodontics – Preliminary casting – model – or trial denture
Patent
1996-03-20
1998-04-07
O 'Connor, Cary E.
Dentistry
Prosthodontics
Preliminary casting, model, or trial denture
433223, A61C 1100
Patent
active
057356920
ABSTRACT:
A method of investment casting a dental restoration and a dental restoration made, thereby and a pattern therefor, include, in the preferred embodiment thereof, the forming of a wax pattern that includes at least two wax retainers interconnected by a wax link that includes a separable link made of a preformed wax pair of blades with confronting parallel identically shaped surfaces in prepositioned intimate contact. The link is preferably set into a slot of the same thickness as the link cut into the connector of the pattern as the retainers are mounted on precisely positioned models of tooth abutments, and waxed to the connector faces exposed by the cut. The link is then separated to divide the pattern into two components from which corresponding sections of the restoration are cast by the lost wax investment casting method. The cast sections so formed have weldable faces thereon corresponding to the interface surfaces of the link blade of the pattern components. The faces are laser welded together, being dimensioned to a width that is between one and two times the effective welding depth of the focused laser beam so that the faces can be welded together across their entire areas from two opposite edges of the faces.
REFERENCES:
patent: 3808687 (1974-05-01), Millet
patent: 4740160 (1988-04-01), Hruska
Dental Laboratory Technology, Fixed Restorative Techniques, Operative Crown and Bridge, by Henry V. Murray, B.S., D.D.S. and Troy B. Sluder, D.D.S., M.S., 1972 University of North Carolina; "I ntroduction to Fixed Restorative Techniques", pp. 1-7; Types of Fixed Restorations, pp. 15-16; Impressions, Casts and Dies, pp. 29-30; Wax Patterns, pp. 123-124; Spruing and Investing, pp. 149,154-157; Wax Elimination and Casting, pp. 167, 171-172; Soldering, pp. 197-212; All-Metal Bridges, pp. 243-252.
American Recovery, Excel Laser Welder Dental Laboratory Technique Manual.
belle de st. clair, inc.
O 'Connor Cary E.
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