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 15.23
Figure of merit as a function of number of holes drilled for dental burs
drilling borosilicate glass.
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 15.24
Figure of merit as a function of number of holes drilled for
dental burs drilling acrylic material.
significant removal of diamond particles from the surface of the tool after 50 holes. As expected there
is deterioration of the abrasive performance of the PCD sintered diamond dental burs. Borges et al.
[67]
also reported that the significant loss of diamond particles occurred during cutting with the com-
mercial sintered diamond bur. In addition, the nickel binder shows major defects generated by pulled-
out particles.
Figures 15.28 and 15.29
show SEM images of a CVD diamond-coated bur after drilling experi-
ments on borosilicate glass and acrylic teeth, respectively, for 5 min at a cutting speed of 30,000 rpm.
