AIR ABRASION 3

THE EFFICIENCY OF AIR ABRASION IS INFLUENCED BY

Air pressure
Particle size
Powder flow
Tip size
Tip angle
Tip distance from tooth

AIR PRESSURE

The air abrasive units are used with 20 to 120psi

Higher pressure increases the sensitivity when cutting is in dentine

Most adviceable pressure is 40 to 60psi (not going beyond 80 psi)

PARTICLE SIZE

The particle size used in Air abrasion are 27 - 27.5 micron
(27 micron - 3/4 the size of human hair)

Smaller particle cuts faster and smoother when propelled at high speed.
Smaller article 27-27.5 micron are used to cut teeth.

Large particle are heavier and need more velocity to move.
Large particle 50 micron are used to clean the provisional restoration and inside of crown.

POWDER FLOW

When pressure is reduced the flow will increase and its difficult to evacuate

TIP SIZE

It may be small or large

Small - 0.28mm(0.011 inch)
to
Large- 0.8mm(0.32inch)

TIP ANGLE

Tip is angulated 45 degree while doing Air abrasion procedure.

TIP DISTANCE

Kinetic energy decreases with increase in tip distance

Focused mode - 1-2 mm

Defocused mode - farther away

While using the Air abrasion device

It is adviced to give a short burst(3secs) instead of long spray

Then observe the Preparation and continue the Procedure