Method for the production of a dental moulded part

Abstract

In a method for the production of a dental moulded part, in which there is produced a coquille ( 10 ) having a hollow space ( 11 ) the form of which corresponds in substance to the form of a model ( 2 ) of the moulded part, and in which by filling of the coquille hollow space ( 11 ) with a hardenable material a casting ( 20 ) is produced and hardened, the model ( 2 ) is provided with an offset ( 2 a, 2 b, 2 c ) which is taken into account in the production of the coquille ( 2 ), wherein after the hardening of the casting ( 20 ) this is worked by material removal to produce the dental moulded part.

1 . A method for the production of a dental moulded part, having the following steps: 
 (a) production of a model of the moulded part to be formed,    (b) production of a coquille having a hollow space the form of which corresponds in substance to the form of the model,    (c) production of a casting by filling of the coquille hollow space with a hardenable material and    (d) allowing the casting to harden wherein, the model produced in step a) is provided with an offset which is taken into account in the production of the coquille so that after the hardening of the casting the model may be worked by material removal to produce the dental moulded part.    
     
     
         2 . The method according to  claim 1 , wherein, 
 at least a cavity side of the model is completely provided with an offset.    
     
     
         3 . The method according to  claim 1 , wherein, 
 at least an occlusal side of the model is completely provided with an offset.    
     
     
         4 . The method according to  claim 1 , wherein, 
 the entire surface of the model is provided with an offset.    
     
     
         5 . The method according to  claim 1 , wherein 
 the thickness of the offset depends upon the form of the mouled part to be produced.    
     
     
         6 . The method according to  claim 1 , wherein 
 the thickness of the offset depends upon the hardenable material.    
     
     
         7 . The method according to  claim 1 , wherein 
 the model of the moulded part to be formed is produced on the basis of an optical measurement of a tooth stump on which the moulded part is to be arranged.    
     
     
         8 . The method according to  claim 7 , wherein 
 the model with the offset is produced with the aid of a three-dimensional CAD reconstruction, wherein data obtained in the optical measurement of the tooth stump is taken into account.    
     
     
         9 . The method according to  claim 1 , wherein 
 the coquille is produced by working of at least one coquille blank with a material removing machine.    
     
     
         10 . The method according to  claim 9 , wherein 
 the working of the at least one coquille blank is effected fully automatically, by means of milling, turning, boring and/or grinding.    
     
     
         11 . The method according to  claim 10 , wherein 
 a material removal program, taking into account the desired contours of the coquille and of the coquille hollow space, contains control commands for the material removing machine.    
     
     
         12 . The method according to  claim 10 , wherein 
 the material removal program is produced on the basis of the three-dimensional CAD reconstruction of the model provided with the offset.    
     
     
         13 . The method according to  claim 9 , wherein 
 upon production of the coquille at least one inlet channel is worked into the coquille blank.    
     
     
         14 . The method according to  claim 1 , wherein 
 after the hardening, the casting is placed together with the coquille in a mould receiver of a material removing machine.    
     
     
         15 . The method according to  claim 14 , wherein 
 for the working of the coquille blank and of the casting the same machine is employed, wherein the coquille is again put in place in the tool receiver exactly repositioned.    
     
     
         16 . The method according to  claim 14  wherein 
 in the working of the casting the coquille material serves as support or mounting material.    
     
     
         17 . The method according to  claim 16 , wherein 
 the working of the casting is effected in at least two steps, and in each step a certain region of the casting is worked, wherein the previously worked region of the casting is surrounded with a milling wax or a plastic bedding mass.    
     
     
         18 . The method according to  claim 14 , wherein 
 the working of the casting is effected fully automatically by milling, turning, boring and/or grinding.    
     
     
         19 . The method according to  claim 18 , wherein 
 a material removal program taking into consideration the contours of the casting and of the moulded part to be produced contains control commands for the material removing machine.    
     
     
         20 . A method for the production of a dental moulded part, having the following steps: 
 a) production of a model of the moulded part to be formed,    b) production of a coquille having a hollow space the form of which corresponds in substance to the form of the model,    c) production of a casting by filling of the coquille hollow space with a hardenable material and    d) allowing the casting to harden, wherein    after the hardening, the casting is worked in a material removing fashion, in order to produce the moulded part, and wherein for this purpose the casting, not bedded out, is put in place together with the coquille in a tool receiver of a material removing machine.    
     
     
         21 . The method according to  claim 20 , wherein 
 in the working of the casting the coquille material serves as support or mounting material.    
     
     
         22 . The method according to  claim 21 , wherein 
 the working of the casting is effected in at least two steps, and in each case a certain region of the casting is worked, wherein the previously worked region of the casting is surrounded with a milling wax or a plastic bedding mass.    
     
     
         23 . The method according to  claim 20 , wherein 
 the working of the casting is effected fully automatically by milling, turning, boring and/or grinding.    
     
     
         24 . The method according to  claim 1 , wherein 
 the moulded part is formed of a noble metal alloy.    
     
     
         25 . The method according to  claim 1 , wherein 
 the moulded part is formed of a non-iron metal alloy.    
     
     
         26 . The method of  claim 1 , wherein the moulded part is formed of a Co—Cr—Mo alloy.