Class II Composite Prep Flashcards
Is composite or amalgam newer?
Composite
What are the 4 indications for composite?
Esthetics
Light occlusal contacts
Smaller restorations
Isolation
Does a composite prep usually end up smaller than amalgam?
Yes
Does composite support occlusion?
No
What are the 7 contraindications to composite?
Heavy occlusal forces Occlusal contacts entirely on composite Restorations extending to root surface Deep subgingival margins Diet Poor oral hygiene Unable to isolate
Is there more or less fluid in the deeper portions of the dentin?
More fluid
What is the huge advantage to composite?
Bonding
enamel ground with a bur has ____ suface area
Increased surface area
Layer of debris from when the tooth is cut
Smear layer
◦Prepares the tooth ◦Removes smear layer ◦INCREASES RETENTION ◦Steps: ◦Apply 30-40% phosphoric acid on enamel ◦15 seconds ◦rinse
Acid Etching
____ acid etch pattern:
◦Most common, “honeycomb”◦Dissolution of prism CORES
Type 1
What portion of the tooth has the highest bonding strength?
Occlusal third
What portion of the tooth has the lowest bonding strength?
Cervical third
Advantages of \_\_\_\_\_\_ Esthetic Conserves tooth structure Bonding◦Reduced microleakage and recurrent decay◦Increased retention No metal ◦No mercury arguments from patients ◦No corrosion ◦No galvanic shockCan be economical ◦Vs. crowns and inlays/onlays Preparation may be more forgiving ◦RESTORATION IS NOT!!!
Composite
Disadvantages of \_\_\_\_\_ Low modulus of elasticity Porous More technique sensitive placement More time-consuming placement Microleakage May stick to instrument, resulting in voids Can’t place in bulk Expensive compared to amalgam
Composite
Is composite more or less flexible
More flexible; Low modulus
SHould you ever bevel dentin?
NO
____ is the term used to describe the stiffness of a material
Modulus of elasticity
The following are places to place \_\_\_\_\_\_\_ Enamel margins ◦Especially gingival margin-vulnerable if margin is on dentin, cementum, or sides of enamel rods ◦Ends of enamel rods is ideal Premolars or small molars ◦Ideal preparations Interim restoration ◦Before crown is placed Preventative resin restoration Cingulum rest preparations for RPD
Composite restorations
Conservative Technique
◦Place composite in carious occlusal pits
◦Seal remaining pits and fissures
Preventative resin restoration
What is the main reason for beveling cavosurface margins at gingival?
Greater surface area for bonding
Is Eugenol or Copalite used in composite restorations?
No
A physical mixture of materials
Composite
If there is more filler in a composite, there is _____ strength
MOre strength
_______ composites
◦Less concern over esthetics, more concerned with strength
◦More filler= more strength
◦=less esthetic
Posterior composites
_____ composites:
Increased size of particles
Stronger
Less aesthetic
Macrofill
____ composites:
Smaller sizes
Less strength
More aesthetic leading to a better polish
Microfill
____ composites:
mix of micro and macro fill
Hybrid
______ composites:
◦Particles size 0.005-0.01 micrometers
◦This is what we’re most commonly talking about when we say “composites”
Nanofill
_____ composite:
◦Smaller particles, fewer particles◦Inferior strength and wear resistance
◦Great for using at gingival margin
◦Low elastic modulus
◦Sometimes used for Class V
◦Currently some products being marketed as bulk-fill
-More flexible
Flowable
What is the most important thing when placing a composite?
Isolation
Is breaking the buccal contact necessary on composite prep?
No
Which 2 contacts must be broken on a class 2 composite prep?
Lingual and gingival
Where should a flare be placed on a composite restoration of a max pm?
Facial
