Lec 2 Components of Composites

Question 1

Forms the matrix.

Answer 1

Organic resin

Question 2

Examples of resin-based oligomer matrix (2)

Answer 2

*Bisphenol A-glycidyl methacrylate (Bis-GMA)
*Urethane dimethacrylate (UDMA)

Question 3

Inhibits deformation of the matrix.

Answer 3

Inorganic resin

Question 4

Gives the composite wear resistance and translucency.

Answer 4

Inorganic resin

Question 5

Reduces coefficient of thermal expansion.

Answer 5

Inorganic resin

Question 6

Give examples of inorganic resins.

Answer 6

*Fused silica
*Crystalline quarts
*Lithium aluminum silicate
*Borosilicate glass

Question 7

Unites the resin with the filler.

Answer 7

Coupling agent

Question 8

Silane

Answer 8

Coupling agent

Question 9

Acts as a stress-absorber.

Answer 9

Coupling agent

Question 10

Activates the setting mechanism.

Answer 10

Initiator system

Question 11

Give examples of initiator systems.

Answer 11

*Camphorquinone (CD)
*Phenylpropanedione (PPD)
*Lucirin (TPO)

Question 12

Begins the polymerization reaction when an external energy (light, heat) is applied.

Answer 12

Initiator system

Question 13

To avoid spontaneous reaction (shrinkage) & control the reaction of activators and resin mixtures.

Answer 13

Stabilizers/inhibitors

Question 14

Most commonly used stabilizers / inhibitors.

Answer 14

Hydroquinone

Question 15

Used to control the reaction of activators and resin mixtures.

Answer 15

Stabilizers/inhibitors

Question 16

Organic resin is made up of?

Answer 16

Dimethacrylate monomer / resin-based oligomer matrix