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Direct Composites 2
To measure Shrinkage Composite is cured unconstrained
To measure Shrinkage Composite is cured unconstrained
To measure Stress Composite is Always bonded
Silanised Surface
Adhesive
Composite Resin
Tensiometer
Silanised Surface
Adhesive
Composite Resin
Stress
To measure Stress Composite is Always bonded
The resulting force is called Stress!!
Silanised Surface
Adhesive
Composite Resin
Stress
Shrinkage is only one variable which will define Stress
Surface
Composite Resin
If no adhesive is used
And the tooth is restored with resin
and the resin is light-cured
and the resin is light-cured
Then there is shrinkage and gap formation.
Summary: Unconstrained composite shrinks.
If adhesive is used
If adhesive is used
If adhesive is used
and the resin is light-cured
The composite tries to ShrinkThe adhesive tries to hold! Stress builds-up.
Summary: Bonded composite builds-up Stress.
If the stress is too high : Adhesive fracture may occur!In extreme cases even tooth fractures!
To overcome stress build-up:
To overcome stress build-up:Cumbersome Layering Techniques
To overcome stress build-up:Cumbersome Light-Curing Techniques
SDR imparts little stress And the adhesive holds!!
SonicFill
Posterior composites made faster, easier and better
Bulk Filling
Clinical Requirements
1. Adaptation 2. Depth of cure 3. Low shrinkage
PLUS: maintain critical qualities of posterior composite
Using SonicFill
2012 Trademarks are property of their respective owners
Sonic energyLow Viscosity
(adapt & fill cavity < 5 seconds)
High Viscosity (Press & Sculpt)
High Viscosity
Soni
c off
Achieving Natural Esthetics
Prep Design Composite Selection Shade Selection Finishing Techniques
Clinicians Ability
0.02
1.0
Managing Light
Scattering relates to particle size.
The smaller the particle, the more scattering occurs.
0.5
0.5
Taking a Shade
Numerical vs. Value
A1 D4
Value
Shade Order by Value
TM
Composite Wear
Composite Wear
Composite Wear
Larger particles in a restorative tend to wear faster. Thus limiting the life of the restoration.
Crack Propagation = Bulk Failure