Type C21: Removal of caries and old fillings
Advantages:
– Work perfectly at high speed.
– Great cutting ability.
– Excellent evacuation of the shavings reducing the risk of bur fracture.
– Few enamel prisms’ splinters.
– No overheating.
Type C31
Advantages:
– Breaks the shavings of soft and homogeneous materials.
– Reduces cutting pressure.
– Less vibration
Disadvantage:
– Mere half-life than non cross-cut burs.
– Uneven surface.