Apparatus for obtaining improved dental castings

Metal founding – Means to shape a forming surface – Pattern

Patent

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Details

164244, 164376, 164377, 249 54, B22C 702, B22C 904, B22C 2100

Patent

active

047490209

ABSTRACT:
An apparatus for the preparation of a dental casting from a dental pattern utilizing an exothermic investment material which expands upon curing which comprises a base having a top surface for supporting the dental pattern and a container having a first and a second open end. The container and the base partially enclose the dental pattern when the first open end of the container is disposed upon the top surface of the base. The second end of the container enables the introduction of the exothermic investment material to compeletly encompass the dental pattern. The container comprises a first and a second container portion with each of the first and second container portions having a first and a seond terminating edge. The first and second terminating edges of the first container portion respectively cooperate with the second and first terminating edges of the seocnd container portion for retaining the uncured exothermic investment material within the container. The first and second terminating edges of the first container portion separate from the second and first terminating edges of the second container portion during the expansion of the exothermic investment material upon the exothermic reaction thereof for producing improved accuracy in the dental casting.

REFERENCES:
patent: 1970261 (1934-08-01), Turner
patent: 2193357 (1940-03-01), Greth
patent: 2267329 (1941-12-01), Fowler et al.

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