IADR Abstract Archives
Comparison of Cutting Effectiveness of Diamond Burs with Zr Blocks
Objective:To measure and compare the cutting effectiveness of 10 types of diamond burs through monolithic sintered zirconia.
Method:10 types of diamond burs (n=8) were compared for the cutting effectiveness in Zirconia (CERCON; DeguDent) using a high speed computer controlled cutting device with water spray (5.45L/min). The turbine used to cut the blocks rotated at 300,000 rpm and with the burs at a depth of 2mm into the zirconia during cutting. A 100 gm load was applied during cutting for each bur which made 2-9minute cuts. Zirconia blocks were ultrasonically cleaned (10 minutes-acetone), dried in an oven at 200°C for 5 minutes before and after each cut and weighed (OHAUS Discovery Balances). The length of the cut was also recorded with a 3D digital microscope (Keyence VHX6000). The data were analyzed with ANOVA and Turkey/Kramer post-hoc tests (p=0.05).
Result: Weight loss (Mean ±SD) (n=8).
Items with the same superscript are not statistically different.
Group No. |
Bur No./ Manufacturer |
1st Cut /mg |
2nd Cut/mg |
total |
1 |
6856DC.31.016/ BRASSELER USA |
39.99±8.4c,d |
22.93±2.3c,d |
62.9b,c |
2 |
8856DF.31.016/ BRASSELER USA |
12.58±2.5a,b |
7.56±2.4a,b |
20.1a |
3 |
856DEF.31.016/ BRASSELER USA |
7.2±1.4a |
6.5±5.9a |
13.7a |
4 |
ZR6850.314.016/ KOMET USA |
30.59±7.1a,b,c |
22.28±4c,d |
52.9b,c |
5 |
ZR6881.314.016/ KOMET USA |
98.68±32.5e |
24.48±7.6d |
123.2d |
6 |
F4R SC/ A&M instruments |
61.21±25.5d |
16.7±7.9b,c,d |
77.9c |
7 |
5850.314.016/ KOMET USA |
36.13±6.3b,c |
18.01±5.6c,d |
54.1b,c |
8 |
S5856.314.016/ KOMET USA |
33.23±8.4b,c |
14.76±7.6a,b,c |
48.0b |
9 |
6850.314.016/ KOMET USA |
29.2±7.7a,b,c |
18.26±8.0c,d |
47.5b |
10 |
770.8VF ZIRCONIA/ PREMIER |
41.4±12.0c,d |
21.1±3.81c,d |
62.5b,c |
Conclusion: Overall Komet diamonds (Group 5) cut zirconia significantly greater than all other diamonds (p<.05). The second 9 minute cut was less than the first cut except for the Group 3 which produced the least cutting. Reduced cutting effectiveness after the first cut indicates that these diamonds may be single use.