SONO-ABRASION

SONO-ABRASION

INTRODUCTION
A recent development from the original ultrasonics ,is the use of
high-frequency, sonic, air-scalers with modified abrasive tips – a technique known
as ‘sono-abrasion’

The Sonicsys micro unit, designed by Drs Hugo, Unterbrink and
Mösele

Sono-abrasion is based upon the Sonicflex 2000L and 2000N air-scaler handpieces that oscillate in the sonic region (< 6.5 kHz)

WORKING PRINCIPLE

Sono abrasion technique is based on the removal of tooth material by an air-driven hand piece equipped with a diamond-coated working tip that removes tooth material by ultrasonic kinetic energy.

sono-abrasion has been introduced as an alternative for preparing minimally invasive cavities .

Sono abrasion technique was initially developed to prepare predetermined cavity outlines but also works well in removing hard tissue when finishing cavity preparation.

DIAMOND TIPS
Different sizes and shapes of diamond tips have been designed.
There are three different instrument tips:
lengthways halved torpedo shape (9.5 mm long, 1.3 mm wide),
small hemisphere (1.5 mm diameter) and
large hemisphere(2.2 mm).

As these tips are coated only on one side, additional damage and trauma of the approximal side of adjacent teeth is prevented.

The constricted shape of the tip enables easy access in small occlusal and approximal cavities.

Sono-abrasion can be used for beveling the cavity margins, thereby improving the marginal adaptation of a composite filling

AIR ABRASION 4

PROTECTION DURING AIR ABRASION

Care should be taken to protect from aluminium oxide dust generated during Air abrasion procedure

INTRAORAL

High velocity vaccum shoulb be used.

Rubber dam or 2x2 or 4x4 size gauze laced in the throat .

EXTRAORAL

Safety glasses for dentist and patient while doing Air abrasion procedure.

Shield for dentist.

Adviced to cover sensitive equiments like camera and computer.

Particles less than 10 micron can penetrate the lung alveolar tissue.

Large article can be a upper airway irritant.


PARALLEL WATER TECHNIQUE-RAINEY

In Air abrasion, Particles are guided through a stream of water,cutting is more efficient and reduce the scattering of dust.
Disposable rear surface mouth mirror are adviced to use bcoz particles bounced off the tooth can ruin the mouth mirror.

In class II preparations barrier(rubber dam or matrix) should be used to protect the adjacent tooth.