Dental prosthesis fabrication

Abstract

A method is disclosed for forming an accurate stone cast from a dental hydrocolloid impression, used for the purpose of prosthetic fabrication, such as dental prostheses. The dental stone catalyst, calcium sulfate dihydrate, is engaged onto the internal surface of set hydrocolloid impression. This catalyst, placed in the area between impression material and wet, mixed stone, will act to hasten the initial setting of 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. The setting radiates outwardly, away from the impression/stone interface. The mixed stone better resists distortion upon setting and the resultant set stone cast is more accurate.

1 . An improved method for producing an indirect dental prosthesis, comprising the steps of: a. attaching calcium sulfate dihydrate stone setting catalyst onto the surface of a set hydrocolloid impression material; b. pouring a wet, mixed dental stone into said dental impression and onto said calcium sulfate dihydrate stone setting catalyst, whereby the dental stone juxtaposed to said calcium sulfate dihydrate stone setting catalyst sets faster, and further whereby, an accurate gypsum cast is formed by a stratified set of stone, thereby, enabling accurate restoration or prosthesis fabrication. 
     
     
         2 . A method according to  claim 1 , wherein said hydrocolloid impression material is reversible hydrocolloid. 
     
     
         3 . A method according to  claim 1 , wherein said hydrocolloid impression material is irreversible hydrocolloid. 
     
     
         4 . An improved method of fabricating dental prostheses, comprising the steps of:
 a) attaching calcium sulfate dihydrate onto internal surface of set hydrocolloid dental impression;   b) pouring wet, mixed dental stone into said dental impression, and into contact with said calcium sulfate dihydrate, whereby, said wet, mixed dental stone sets faster closest to said dental impression, and further whereby, a cast of stratified set of stone occurs;   c) fabricate prostheses in usual manner on said cast of stratified set of stone.   
     
     
         5 . A method according to  claim 4 , wherein said hydrocolloid dental impression comprises set dental stone remnant of calcium sulfate dihydrate, attached to said internal surface, from a previous stone pour. 
     
     
         6 . A method according to  claim 4 , wherein, said calcium sulfate dihydrate stone setting catalyst is applied to set hydrocolloid dental impression material by direct application. 
     
     
         7 . A method according to  claim 4 , wherein, said calcium sulfate dihydrate stone setting catalyst is applied to set hydrocolloid dental impression material by immersion into calcium sulfate dihydrate solution.