Chapter 5 Direct Polymeric Restorative

Question 1

What are polymers?

Answer 1

Materials that are made of large, long molecules formed by chemically reacting molecules.

Question 2

Within Polymers what are those molecules that are formed by chemical reaction called?

Answer 2

Monomers

Question 3

What are the two types of polymers?

Answer 3

thermoplastic and thermoset

Question 4

What are thermoplastic?

Answer 4

• can be heated and shaped, after ploymerization
• can melt

Question 5

What are thermoset?

Answer 5

• final shape before polymerization
• Could decomposes

Question 6

What are the different types of dental resins?

Answer 6

Acrylic resins
Composite materials
Glass lonomer materials
Compomers

Question 7

Most dental resins are?

Answer 7

Thermoset

Question 8

What are composite materials?

Answer 8

• A combo of 2 materials
• composed of 2 phases: matrix and filler

Question 9

What is a matrix?

Answer 9

• bis-GMA
• organic chemical calledd diluent is added to control vicosity.
• weakest and least wear resistant phase of composite
• MAnufactors adds FILLER to increase strenght

Question 10

Within matrix the organic chemical called diluent is added to what?

Answer 10

Control Viscosity

Question 11

What are the positives and negatives of matrix?

Answer 11

1. Positive- Polymerizes to form solid mass
2. postivive- bonds to tooth structure
3. Neg- weakest and least wear resistant phase
4. neg- absorbs water, can stain

Question 12

What is added to matrix to increase its strength?

Answer 12

Fillers

Question 13

What are fillers?

Answer 13

enginerred glass materials
coated in silane coupling agent

Question 14

How are composites classsified?

Answer 14

By their filler size

Question 15

If filler contenet is increase then what occurs?

Answer 15

• reduces polymerization shrinkage
• increases hardness and abrasion resistance

Question 16

What are macrofilled composites?

Answer 16

• Filler particles are large
• higher filler content
• feels rough to dental explorer
• plaque accumulation and staining
• mainly used in ortho

Question 17

What is microfilled composites?

Answer 17

• Filler particles are small
• low filler content
• smooth similar to enamel
• used for esthetics
• Best for class V

Question 18

What is hybrid composites ?

Answer 18

• mix of large and small filler particles
• high filler content
• high strength and abrasion resistant
• used in most areas of the mouth

Question 19

What are glass Ionomer materials?

Answer 19

• release fluoride over time
• opaque
• mixed of powder and a liquid
• sets chemically
• poor wear resistance
• Most commonly used for Class V

Question 20

What are resin- modified glass Ionomer?

Answer 20

• hybrid material of glass ionomer and resin
• light cured
• release fluoride
• stronger and tougher than glass ionomer

Question 21

What are pits and fissures sealants?

Answer 21

• Preventive materials applied to pits and fissures
• composite material
• prevent or reduce caries
• can be placed by hygienist

Question 22

What is enamel acid-etch?

Answer 22

• phosphoric acid
• allows material to bond to enamel