Dental Bur Colour Guide: What Do Black, Green, Blue, Red and Yellow Rings Mean?
One of the most common questions asked by newly qualified dentists is:
“What do the different coloured bands on dental burs mean?”
Whether you are carrying out a crown preparation, veneer preparation, composite finishing procedure or ceramic adjustment, understanding diamond bur grit sizes is essential for achieving predictable clinical results.
The coloured ring found on a diamond bur indicates the grit size of the diamond particles bonded to the surface of the bur.
The grit determines how aggressively the bur cuts and the quality of surface finish left behind.
Black Ring Diamond Burs
Black ring burs are classified as super coarse.
Typical grit size:
151-213 microns
Applications include:
- Rapid crown removal
- Heavy tooth reduction
- Bulk ceramic reduction
- Large amalgam removal
- Gross contouring
Advantages:
- Fast cutting
- Reduced chair time
- Efficient material removal
Disadvantages:
- Rough surface finish
- Greater heat generation
- Requires refinement with finer burs
Green Ring Diamond Burs
Green ring burs are coarse diamonds.
Typical grit size:
107-181 microns
Applications include:
- Crown preparation
- Zirconia reduction
- Occlusal reduction
- Bulk enamel reduction
These are among the most commonly used crown preparation burs.
Blue Ring Diamond Burs
Blue ring burs represent medium grit diamonds.
Typical grit size:
66-126 microns
These burs are often considered the ideal balance between cutting efficiency and surface quality.
Applications:
- Crown preparation
- Veneer preparation
- Onlay preparation
- Finishing reductions
Many dentists complete the majority of their preparation using blue grit burs.
Red Ring Diamond Burs
Red ring burs are fine diamonds.
Typical grit size:
27-76 microns
Applications:
- Margin refinement
- Crown preparation finishing
- Veneer finishing
- Ceramic adjustments
Red grit burs create smoother preparation surfaces which can improve scanner accuracy.
Yellow Ring Diamond Burs
Yellow ring burs are extra-fine finishing diamonds.
Typical grit size:
10-36 microns
Applications:
- Final preparation refinement
- Ceramic finishing
- Composite contouring
- Margin polishing
These burs create the smoothest preparation surfaces before impression taking or scanning.
Which Grit Should You Use?
As a general rule:
Green = Reduction
Blue = Preparation
Red = Refinement
Yellow = Final Finishing
Understanding this simple progression can significantly improve preparation quality and restorative fit.
For more information about selecting the correct bur shape, read our Complete Guide to Dental Burs.
