Selection of Composite Materials Flashcards
Name the 5 mentioned composite materials.
- composite resins
- composers
- resin ionomers
- glass ionomers
- adhesives
The commonly used monomers in adhesive resins have differing viscosities. Order the three common monomers in order of most viscous to least viscous.
MOST»_space;> LEAST = B.U.T.
BisGMA
UDMA
TEGDMA
T/F: BisGMA and UDMA are hydrophobic monomers.
True
T/F: TEGDMA is used as a diluent.
True
T/F: Etching causes sensitivity.
True
T/F: Dental adhesive systems area “total etch” or “selective etch”
True
The “Total Etch” system is ____ steps.
3
etch and rinse system
The “Selective Etch” system is ____ steps.
2
self etching
T/F: Stability of the adhesive interface is the key to long term success.
True
T/F: No adhesive performs as well as GI or RMGI.
True
Stability of the adhesive interface is related to a _____ ____ junction.
Water tight
T/F: Self etch systems are poor in regard to creating a water tight junction.
FALSE
What are the 3 steps in a total etch system?
- etch
- prime
- bond/adhesive
T/F: Self-etch systems do not etch enamel as well as phosphoric acid.
True, many systems recommend a selective etch of enamel
T/F: Sensitivity is rare on anterior teeth regardless of the adhesive system used.
True
T/F: Self-etch systems reduce posterior sensitivity.
True
What are a few ways that posterior sensitivity can be reduced when using a total etch?
- short etch times
- RMGI liner or base
- apply GLUMA after total etch
- do not over-dry
Dispersed silanated glass fillers differ in size. What size fillers are in macrofill, midfill, and microfill resins?
Macro: 30-50 micrometers
Mid: 1-10 micrometers
Micro: 0.01-0.1 micrometers (~50nanometers)
T/F: Filler size diversity allows for denser packing.
True
Herculite is a _____ hybrid system.
micro
“State of the art” products include ____, _____, and ____ resins.
“Useful adjuncts” include _____ and ____.
“Standard of Care” resins include _____.
State of the Art: bulk filled, low shrinkage, nanofilled
Useful: flowables and packables
Standard: microhybrids
What is required to make bulk-fill materials?
- Adequate cure depth
- Translucency
- Initiator systems
- Stress reduction related to polymer phase
T/F: You can expect comparable outcomes with bulk fill materials compared to conventional composites.
True
T/F: Bulk fill composites tend to have higher stress contraction.
False, LOWER contraction stress in bulk fills
T/F: Posterior composites are at a 3-4 times greater risk for recurrent caries.
True
T/F: Composites in premolars perform better than in molars.
True (according to seghi)
What is a major difference between glass ionomers and composites in regards to adhesion?
Glass Ionomer = adhesion to tooth directly
Composite = requires adhesive (duh!)
Glass Ionomers are ____-based.
water
Composites are _____-based.
polymer
Glass Ionomers set by a ____ reaction.
acid-base
Composites set by a _____ reaction.
free radical
T/F: Poor stain resistance is a disadvantage of GI.
True
T/F: Glass ionomer has early dissolution and slow set.
True
GI and RMGI both have water and copolymers. RMGI includes 30% _____.
HEMA (wetting agent)
The resin ionomer reaction includes ___ cures. Order them based on speed of cure.
1 FAST….2 Intermediate….3 SLOW
- Light cure free radical reaction
- Self cure free radical reaction
- Acid-Base reaction
T/F: RMGI is proven best in class v restoration.
True
T/F: RMGI adheres to tooth mineral structure
True
T/F: Dissolution of RMGI is a problem in high caries risk patients.
True
Compomers are ______-modified resins.
polyacid
What is MTA composed of (2 things)?
- Portland Cement
2. Bismuth Oxide
T/F: RMGI makes a good adjunct when restoring a subgingival class II on a high caries patient.
True
T/F: Minifilled hybrids have the best performance to support their use.
True
T/F: 3 step etch techniques are still considered Gold Standard.
True
T/F: Traditional layering techniques are still a good idea due to depth of cure for most materials.
True (2-3 layers at most)
