Biomedical Engineering Reference
In-Depth Information
1.2
1
0.8
0.6
0.4
0.2
0
0
10
20
30
40
50
Number of holes drilled
Uncoated bur
Sintered diamond bur
HFCVD diamond bur
FIGURE 15.25
Figure of merit as a function of number of holes drilled
for dental burs drilling human tooth material.
Worn
cutting edge
20 kV
X2,500
10
ยต
m
FIGURE 15.26
Worn cutting edge uncoated WC-Co dental bur after drilling
borosilicate glass.
After machining, it is evident that the diamond films are still intact on the pretreated WC sub-
strate and diamond coating displayed good adhesion. Also there is no indication of diffusion wear
after the initial test for 50 holes. However, the machined materials such as glass pieces erode the
cutting edge of the diamond dental bur as adhesive wear was observed (
Figure 15.28
). After
