Plastic and nonmetallic article shaping or treating: processes – With step of cooling to a temperature of zero degrees c. or...
Patent
1979-08-30
1982-11-30
Hoag, Willard E.
Plastic and nonmetallic article shaping or treating: processes
With step of cooling to a temperature of zero degrees c. or...
264 16, 264168, 264157, 264162, A61C 300, B29C 300
Patent
active
043615287
ABSTRACT:
A method of making a thermoplastic dental impression tray which can be heated, placed into the patient's mouth where it can be intimately molded to approximate the patient's tissues and characterized in that the tray will maintain its molded structure to a high degree of accuracy. Methyl methacrylate monomer liquid and polymer powder are mixed together and the mixture is allowed to reach a doughy state. The mixture is placed into a mold conforming to the desired structure of the tray. The mold is then heated for a sufficient time under pressure to polymerize the monomer to provide a tray characterized in that when heated to above 135.degree. F. it wil become soft enough so that it can be placed into the patient's mouth for intimate molding therein and which will become so hard when cooled in the mouth that it will exhibit a recovery rate of less than 2% after removal from the mouth so that the precision of the impression is accurately maintained.
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Draheim Frederick E.
Ginsburg Stephen J.
Black Knight Investments Limited
Hoag Willard E.
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