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MINIMALLY INVASIVE TECHNIQUES
IN CAVITY PREPARATION
THE HAPPY WAY OF TREATING DECAY.
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THROUGH THE TIMES
Hand instruments Chisel and mallet Mechanical handdriven rotary cutting
Motor driven rotary
cutting
Air rotor hand
pieces
What next?
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MECHANICAL, ROTARY
Sensitivity of vital
dentine
Mechanical stimulation
Bone-conducted noise
and vibration
Thermal stimulation
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MINIMALLY INVASIVE TECHNIQUES
Mechanical, non-rotary
Chemico-mechanical
Photo-ablation
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MECHANICAL, NON-ROTARY
AIR ABRASION AIR POLISHING
SONO ABRASION
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AIR ABRASION
Developed by R.B. Black in 1945
Pseudo-mechanical method
Bombarding the tooth surface with high-velocity
particles(conventionally Aluminium oxide (Al2O3)
carried in a stream of air
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ADVANTAGES OF AIR ABRASION
REDUCES HEAT GENERATION
REDUCES
VIBRATION ANDUNNECESSARY MECHANICALSTIMULATION
RELATIVELY PAIN FREE PROCEDURE
VIRTUALLY ELIMINATES ANY MICRO-
FRACTURES
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AIR POLISHING
Water soluble particles of sodium bicarbonate
are applied onto the tooth surface
Air pressure is used for application, in a
concentric water jet
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ADVANTAGES
There is no physical contact with thetooth, therefore thermal injury is of noconcern.
Provides smoother finishing for cavitywalls
It is a very good alternative for patientswho are allergic to the sand used in airabrasion.
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EFFECT OF AIR POLISHING ON INCIPIENT
LESION
Before After
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SONO ABRASION
Based upon the sonicflex 2000l and 2000n air-
scalers, handpiece that oscillate in the sonic
region(
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STRUCTURE OF THE TIP
They are diamond coated on one side using 40m grit
diamond and are cooled using water irrigant at a flow
rate of 20-30 ml/min
Cavitips
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ADVANTAGES
Main advantage of sono abrasion is that their
tips are coated with diamond only on one side
so while preparing class 2 cavities there is
virtually no harm to the adjacent tooth.
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CHEMICO-MECHANICAL METHOD
1976, Goldman and Kronman
Removes carious material chemically using
N-MONOCHLOROGLYCINE (NMG, GK-101)
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CARISOLV GEL
Mechanism of action
The solution has a ph of around 11 and it is postulated that
the positively and negatively charged groups on the amino
acids become chlorinated and further disrupt the collagencross linkage in the matrix of the carious dentine
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ADVANTAGES
Removes infected dentinewithout damage to underlyingaffected dentine
Reduced need for localanesthesia
Increased patient compliance
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PHOTO ABLATION
First ruby laser by Maiman in 1960
Types :-
Er,Cr:YSGG
Er:YAG
ArF:Excimer
Nd:YLF
Laser powered hydrokinetic
system
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ADVANTAGES
U.V. emission of EXCIMER laser (377 nm)is selective in removing carious dentine
Sterilization of target area
Dentin surface
treated with EDTA
Dentin surface treated
with Er:YAG laser
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THANK YOU AUTHOR-
VISHWAS MADAAN
4TH YEAR
M.G.M. DENTAL COLLEGE
GUIDED BY
DR. VANITA SHENOYH.O.D. {CONSERVATIVE
DENTISTRY}
DR. PRAKASH BIRADAR
{LECTURER}
