Method and device for producing by electrophoresis fully ceramic tooth element having a predefined spatial shape

Abstract

The invention relates to a method and device for producing by electrophoresis fully ceramic tooth elements having a predefined spatial shape, wherein an electric conductive plate ( 1 ) having different conductive areas is applied to a working model or a structural element directly or at a certain distance. According to a known method, a power is supplied to the plate by means of a cable, which is removable after coating by means of a slip and prior to sintering. According to the inventive method, said laborious operation is nor required anymore. The inventive method consists in fixing the plates ( 1 ) to a conductive tooth stump ( 2 ) by means of an adhesive conductive material ( 5 ) or to an implant abutment ( 3 ). The power can be supplied by the tooth stump, the abutment or a leg ( 7 ) integrateable with the plate. Said plate is preferably made of zinc or an adhesive conductive material, preferably a mixture of wax and zinc powder which disappears without residues by sintering. A plate which is particularly suitable for carrying out said method and whose conductivity variations are obtainable by means of recesses embodied therein is also disclosed.

1 . A method for the production of fully ceramic tooth elements with a predefined spatial shape, by means of electrophoresis, wherein an electrically conductive chip ( 1 ) is placed on a working model ( 2 ) or on a structured element ( 3 ) directly or at a distance, and the chip has areas ( 4 ) of different conductivities, characterized in that the supply of current to at least one chip ( 1 ) takes place via a conductive adhesive material ( 5 ). 
   
   
       2 . A method according to  claim 1 , characterized in that with implant-abutments, the chip is adhesively affixed to at least one abutment and the supply of current takes place via the abutment. 
   
   
       3 . A method according to  claim 1 , characterized in that with a nonconductive working model ( 2 ), at least one tooth stump is coated with a metal-containing film, which dissolves without residue during the sintering. 
   
   
       4 . A method according to  claim 3 , characterized in that zinc is used as the metal for the coating. 
   
   
       5 . A method according to at least one of  claims 1  to  4 , characterized in that the supply of current takes place via a leg ( 7 ) of the chip. 
   
   
       6 . A method according to at least one of  claims 1  to  4 , characterized in that the conductive, adhesive material is made of a mixture of wax and a zinc metal powder. 
   
   
       7 . An electrically conductive chip having areas ( 4 ) of different conductivities, the chip being for use in the production of fully ceramic tooth elements with a predefined spatial shape by means of electrophoresis, wherein the chip is placed on a working model ( 2 ) or on a structured element ( 3 ) directly or at a distance, and current is supplied to the chip ( 1 ) via a conductive adhesive material ( 5 ), the chip characterized by areas of different conductivities produced in the chip by recesses. 
   
   
       8 . A chip according to  claim 7 , characterized in that it is made of zinc. 
   
   
       9 . A chip according to  claims 7  or  8 , characterized by a thickness of 0.03 to 0.15 mm. 
   
   
       10 . A chip according to one of  claims 7  to  8 , characterized in that it is cut out of metal foil by means of a laser.