Dental prosthesis and manufacturing method thereof

Abstract

The present invention relates to a dental prosthesis, and more particularly, to a screw-engagement type dental prosthesis which enables non-preparation of the natural tooth because it is manufactured by division into two pieces or three pieces, which can be simply installed, and in which the occlusal pressure can be uniformly dispersed. Also, the present invention relates to a method of casting a screw-engagement type dental prosthesis by using a bolt made of carbon or ceramics. Furthermore, a keeper and a body are engaged with each other via a bolt in a state where thin and semi-conical maintaining portions formed on inner inclination surfaces of abutment teeth of both sides with a small preparation are accurately engaged with keys formed on inner inclination surfaces of the keeper and the body in correspondence to the maintaining portions.

1 . A method of forming a female screw on a dental prosthesis, comprising the steps of: manufacturing a ceramic bolt obtained by mixing ceramic materials, compression-molding the mixture into a round bar of a predetermined length, sintering the round bar and processing a screw thread of the ceramic bolt and a head through a turning and grinding process after contraction and deformation of the ceramic round bar is completed; and forming female screw adopting the ceramic bolt according to a casting method. 
     
     
         2 . A method of forming a female screw on a dental prosthesis according to  claim 1 , sintering is performed at temperature of 1,400° C. 
     
     
         3 . A method of forming a female screw on a dental prosthesis according to  claim 2 , the ceramic bolt is used to form a body hole with a bolt for duplication.