Method and apparatus for making the inner crowns of composite- layered crowns for restoring crowns

摘要

In a method and apparatus for making an inner crown of a composite- layered crown for the restoration of crowns, said inner crown being composed mainly of a noble metal, an electrically conductive coating material undissolvable in a plating bath is applied and solidified on an inner crown-forming surface of a working model of a tooth on which the state of the tooth to be restored is reproduced and which is formed of a non-conductive material, and electrical connection is made so as to render said conductive coating material cathodic, while said coating material is immersed in said plating bath; an anode is immersed in said plating bath, while said anode is fixedly located on a position opposite to said inner crown-forming position; an auxiliary electrode formed of the same metal as the metal to be plated is fixed for immersion in said plating bath between said anode and said cathode, while its one end is or is not connected to said anode and its other end is opposite and adjacent to a recess in said cathode; and a pulse current is impressed between said anode and said cathode at a pulse width of 0.01 to 50 msec. and a pulsed current density of 1 to 20 A/dm.sup.2 and in a duty cycle of 1 to 30% for electroplating, thereby making said inner crown.