Dental gypsum cast

Abstract

A method is disclosed for forming an accurate stone cast from a dental impression, used for the purpose of prosthetic fabrication, such as dental crowns and dentures. The initial step of this unique method is to first acquire a suitable amount of dental stone setting catalyst. One type of a suitable stone catalyst is calcium sulfate dihydrate. The dental stone catalyst is engaged onto the internal surface of the impression. This catalyst will act to hasten the initial setting of wet, mixed dental stone that is in closest proximity to the impression. The result is a stratified set of the stone. Setting of the wet, mixed dental stone occurs first at the impression/stone interface.

1 . An improved method for producing a stone dental cast comprising the steps of:
 a. placing a thin layer of dental stone setting catalyst, onto the internal surface of an elastomeric dental impression;   b. pouring a wet, mixed dental stone into said elastomeric dental impression and onto said catalyst,   whereby the dental stone juxtaposed to said catalyst sets faster, and further whereby, an accurate gypsum cast is formed by a stratified set, thereby, producing accurate restoration or prosthesis.   
     
     
         2 . A method according to  claim 1 , wherein said dental stone setting catalyst comprises dental stone remnant attached to said internal surface, from a previous stone pour. 
     
     
         3 . A method according to  claim 1 , wherein said dental stone setting catalyst is a thin layer of wet mixed dental stone. 
     
     
         4 . An improved method for producing a dental stone cast comprising the steps of:
 a. placing a thin wet, mixed dental stone layer onto elastomeric impression surface,   b. allowing cure of said mixed dental stone layer, then   c. pouring sufficiently more wet, mixed stone into elastomeric impression and over said dental stone layer to make a dental cast.   
     
     
         5 . A method for making a dental gypsum cast comprising the steps of (a) pouring wet mixed dental stone into a dental impression of oral structure, wherein said dental impression comprises cured elastomeric material (b) setting of said wet mixed dental stone (c) recovering cured dental stone from said cured elastomeric material, the improvement comprising control of stone setting deformation by fixing thin layer of stone setting catalyst onto all internal surface areas of interest of said cured elastomeric material. 
     
     
         6 . Said stone setting catalyst, of  claim 5 , is thin layer of residual stone from previous stone pour.