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Cutting efficiency of three diamond bur grit sizes
S C Siegel1, J A von Fraunhofer
1Department of Restorative Dentistry, School of Dentistry, University of Maryland, 666 West Baltimore St., Baltimore, Md. 21201, USA. scs001@dental.umaryland.edu
Journal of the American Dental Association (1939)
|January 6, 2001
Summary
Coarser diamond burs do not significantly increase cutting rates (CRs) for initial tooth preparation. Medium-grit burs show a greater decrease in CR over time compared to coarser grits.
Area of Science:
- Dental Materials Science
- Biomaterials Engineering
- Clinical Dentistry
Background:
- Diamond burs are crucial for efficient tooth preparation, with coarser grits often favored for speed.
- However, the impact of grit size on cutting rates (CRs) and surface finish requires detailed investigation.
Purpose of the Study:
- To compare the cutting rates of medium-, coarse-, and super-coarse-grit diamond burs during tooth preparation.
- To evaluate the efficiency and potential trade-offs associated with different diamond bur grit sizes.
Main Methods:
- A standardized glass ceramic substrate was cut using medium-, coarse-, and super-coarse-grit diamond burs under controlled load and coolant flow.
- Cutting rates (CRs) were determined by measuring transection time per millimeter.
- Statistical analysis included one-way ANOVA and post hoc Scheffé tests.
Main Results:
- No significant difference in CR was observed between the three grit sizes for the initial 13 mm cuts.
- Over a total cut length of 39 mm, super-coarse-grit burs showed a significantly faster CR than medium-grit burs (P < .01).
- The decrease in CR over the total cutting period was 50% for medium-grit, 35% for coarse-grit, and 25% for super-coarse-grit burs.
Conclusions:
- While coarser diamond burs may offer benefits in gross tooth reduction, their impact on surface finish, heat, and enamel damage must be considered.
- The observed differences in CR are primarily due to the greater reduction in cutting efficiency of medium-grit burs over extended use.
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