investment

investment /in·vest·ment/ (-vest´mint) material in which a denture, tooth, crown, or model for a dental restoration is enclosed for curing, soldering, or casting, or the process of such enclosure.

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investment [in-vest´ment]

1. any tissue, such as fascia, that envelops or covers other tissues or parts.

2. a material applied as a soft paste to a pattern that hardens to form a mold for casting.

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investment (invest´ment),

n the material used to enclose or surround a pattern of a dental restoration for casting or molding or to maintain the relations of metal parts during soldering.

investment, casting,

n a type in which the casting mold is made in fabrication of gold or cobalt-chromium castings.

investment, gypsum-bonded casting,

n a type that can be bonded by a-hemihydrate, a derivative of gypsum, because the fusion temperatures of the metal alloys to be cast in it are relatively low. All gold alloy investments and some low-fusing cobalt-chromium alloy investments are gypsum bonded.

investment, hygroscopic

n a type specially designed for use with the hygroscopic investing techniques.

investment, phosphate-bonded casting,

n a type that is bonded by a phosphate and a metallic oxide that react to form a hard mass; generally used for high-fusing alloys.

investment, refractory,

n a type in which the investing materials can withstand the high temperatures used in soldering or casting.

investment, sectional,

n a type using a mold made in sections.

investment, silica-bonded casting,

n a type that is bonded by a silica gel that reverts to cristobalite in heating and is generally used for high-fusing alloys.

investment, soldering,

n a quartz type, preferably one with a very low thermal expansion, used for the investment of appliances during the soldering procedure.