Composition
What are the three components making up Composite?
Resin Matrix, Filler Particles, Coupling Agent
By incorporating ________ and ________, composite materials became radiopaque.
Barium, Zinc
Fair strength, does not wear well, and is does not polish well.
Macrofill
What must the dentist be careful not to introduce during the placement of composite?
Air Bubbles
What does PRR stand for?
Preventive Resin Restoration
What is the resin matrix? (3 parts)
thick liquid that reduces viscosity of the material, reduces shrinkage, makes the material adaptable
_________ determines the properties of a composite material.
Filler Particles
Much smaller particle size, lower strength, polishes smoothly.
Microfill
Why do composites need to be bonded?
To prevent microleakage
What type of composite is most used for most classes?
Hybrid
What are the filler particles made of?
quartz, silicate, ceramic, glass
The ______ the restoration, the ________ the long term success rate.
The larger the restoration, the lower the long term success rate.
Hybrid
How far should the light be from the tooth when curing?
1-2 mm
What are 3 reasons the Mylar strip is used?
Cut off oxygen, shape composite, prevent bonding to adjacent teeth
What do filler particles do for composite?
provides strength and wear resistance, controls handling characteristics, reduces shrinkage
Condensable composite is used in class _____ and class _____.
I and II
When esthetics is critical, Microfill is used for ______ and class ______.
Veneers, Class V
Why are class V composites the least successful?
gingival margin ends in cementum and composite bonds better to enamel, and moisture contamination
The wear of composite is directly related to..
filler particle size and percentage, amount of resin between filler particles
What does the coupling agent do for the composite?
silane provides bond between the filler particles and resin matrix
Macrofill composite is now used mainly for bonding __________ __________.
orthodontic brackets
What are the 4 benefits that come with each new generation of composites?
Increased strength, decreased wear, increased esthetics due to polishability and translucency, reduces polymerization shrinkage.
What do we use to retain composite restorations?
Chemical Bonding
With each generation of composites, particle size _________, percentage of filler particles _________, and amount of resin __________.
decreases, increase, decreases