Durability of tungsten carbide burs for the fabrication of titanium crowns using dental CAD/CAM.
The purpose of this study was to evaluate the durability of tungsten carbide burs for the fabrication of titanium crowns using two dental CAD/CAM systems (DECSY, Digital Process, Japan and Cadim, Advance, Japan). A tungsten carbide bur in each system was examined and used without fracture to fabricate 51 titanium crowns. For both systems tiny chips were found on the bur blade at the 11th machining. These chips gradually enlarged as the number of machining times increased. At the first machining no significant difference in the average surface roughness was found on the crown between the two systems (1.6 microm for DECSY and 1.2 microm for Cadim). The cutting grooves became dull and the average surface roughness increased as the number of machining times increased. It is concluded that the tungsten carbide burs for both systems can be used to fabricate up to 51 titanium crowns.
Deaprtment of Oral Biomaterials and Technology, Showa University School of Dentistry, Hatanodai, Shinagawa-ku, Tokyo, Japan. hotta@dent.showa-u.ac.jp
Yasuhiro
Y
Hotta
Takashi
T
Miyazaki
Toshihisa
T
Fujiwara
Shoko
S
Tomita
Akiyoshi
A
Shinya
Yasuhisa
Y
Sugai
Hideo
H
Ogura
D017076:Computer-Aided Design; D003442:Crowns; D003762:Dental Instruments; D017267:Dental Prosthesis Design / Q000295:instrumentation*; D008855:Microscopy, Electron, Scanning; D013499:Surface Properties; D014025:Titanium; D017973:Tungsten Compounds
D017973:Tungsten Compounds; C002802:tungsten carbide; D014025:Titanium