Selection of Composite Materials

Question 1

Name the 5 mentioned composite materials.

Answer 1

1. composite resins
2. composers
3. resin ionomers
4. glass ionomers
5. adhesives

Question 2

The commonly used monomers in adhesive resins have differing viscosities. Order the three common monomers in order of most viscous to least viscous.

Answer 2

MOST&raquo_space;> LEAST = B.U.T.
BisGMA
UDMA
TEGDMA

Question 3

T/F: BisGMA and UDMA are hydrophobic monomers.

Answer 3

True

Question 4

T/F: TEGDMA is used as a diluent.

Answer 4

True

Question 5

T/F: Etching causes sensitivity.

Answer 5

True

Question 6

T/F: Dental adhesive systems area “total etch” or “selective etch”

Answer 6

True

Question 7

The “Total Etch” system is ____ steps.

Answer 7

3

etch and rinse system

Question 8

The “Selective Etch” system is ____ steps.

Answer 8

2

self etching

Question 9

T/F: Stability of the adhesive interface is the key to long term success.

Answer 9

True

Question 10

T/F: No adhesive performs as well as GI or RMGI.

Answer 10

True

Question 11

Stability of the adhesive interface is related to a _____ ____ junction.

Answer 11

Water tight

Question 12

T/F: Self etch systems are poor in regard to creating a water tight junction.

Answer 12

FALSE

Question 13

What are the 3 steps in a total etch system?

Answer 13

1. etch
2. prime
3. bond/adhesive

Question 14

T/F: Self-etch systems do not etch enamel as well as phosphoric acid.

Answer 14

True, many systems recommend a selective etch of enamel

Question 15

T/F: Sensitivity is rare on anterior teeth regardless of the adhesive system used.

Answer 15

True

Question 16

T/F: Self-etch systems reduce posterior sensitivity.

Answer 16

True

Question 17

What are a few ways that posterior sensitivity can be reduced when using a total etch?

Answer 17

• short etch times
• RMGI liner or base
• apply GLUMA after total etch
• do not over-dry

Question 18

Dispersed silanated glass fillers differ in size. What size fillers are in macrofill, midfill, and microfill resins?

Answer 18

Macro: 30-50 micrometers
Mid: 1-10 micrometers
Micro: 0.01-0.1 micrometers (~50nanometers)

Question 19

T/F: Filler size diversity allows for denser packing.

Answer 19

True

Question 20

Herculite is a _____ hybrid system.

Answer 20

micro

Question 21

“State of the art” products include ____, _____, and ____ resins.
“Useful adjuncts” include _____ and ____.
“Standard of Care” resins include _____.

Answer 21

State of the Art: bulk filled, low shrinkage, nanofilled

Useful: flowables and packables

Standard: microhybrids

Question 22

What is required to make bulk-fill materials?

Answer 22

• Adequate cure depth
• Translucency
• Initiator systems
• Stress reduction related to polymer phase

Question 23

T/F: You can expect comparable outcomes with bulk fill materials compared to conventional composites.

Answer 23

True

Question 24

T/F: Bulk fill composites tend to have higher stress contraction.

Answer 24

False, LOWER contraction stress in bulk fills

Question 25

T/F: Posterior composites are at a 3-4 times greater risk for recurrent caries.

Answer 25

True

Question 26

T/F: Composites in premolars perform better than in molars.

Answer 26

True (according to seghi)

Question 27

What is a major difference between glass ionomers and composites in regards to adhesion?

Answer 27

Glass Ionomer = adhesion to tooth directly

Composite = requires adhesive (duh!)

Question 28

Glass Ionomers are ____-based.

Answer 28

water

Question 29

Composites are _____-based.

Answer 29

polymer

Question 30

Glass Ionomers set by a ____ reaction.

Answer 30

acid-base

Question 31

Composites set by a _____ reaction.

Answer 31

free radical

Question 32

T/F: Poor stain resistance is a disadvantage of GI.

Answer 32

True

Question 33

T/F: Glass ionomer has early dissolution and slow set.

Answer 33

True

Question 34

GI and RMGI both have water and copolymers. RMGI includes 30% _____.

Answer 34

HEMA (wetting agent)

Question 35

The resin ionomer reaction includes ___ cures. Order them based on speed of cure.

Answer 35

1 FAST….2 Intermediate….3 SLOW

1. Light cure free radical reaction
2. Self cure free radical reaction
3. Acid-Base reaction

Question 36

T/F: RMGI is proven best in class v restoration.

Answer 36

True

Question 37

T/F: RMGI adheres to tooth mineral structure

Answer 37

True

Question 38

T/F: Dissolution of RMGI is a problem in high caries risk patients.

Answer 38

True

Question 39

Compomers are ______-modified resins.

Answer 39

polyacid

Question 40

What is MTA composed of (2 things)?

Answer 40

1. Portland Cement

2. Bismuth Oxide

Question 41

T/F: RMGI makes a good adjunct when restoring a subgingival class II on a high caries patient.

Answer 41

True

Question 42

T/F: Minifilled hybrids have the best performance to support their use.

Answer 42

True

Question 43

T/F: 3 step etch techniques are still considered Gold Standard.

Answer 43

True

Question 44

T/F: Traditional layering techniques are still a good idea due to depth of cure for most materials.

Answer 44

True (2-3 layers at most)