Composite

Question 0

2 major components of composite

Answer 0

• organic polymer resin

- inorganic filler particles

Question 1

First dental composite is a mixture of?

Answer 1

• silicate glass

- acrylic monomer

Question 2

Makes composite radiopaque

Answer 2

Barium glass

Question 3

For adhesive bonding of filler to the resin

Answer 3

Coupling agent/keying agent

Question 4

Example of coupling agent (2)

Answer 4

• vinyl silane

- gamma methacryloxy propyl silane

Question 5

Reduces viscosity of resin allowing easier filler incorporation

Answer 5

Diluent

Question 6

Examples of diluent (2)

Answer 6

• methyl methacrylate

- alipathic dimethacrylate

Question 7

Example of catalyst

Answer 7

Benzoyl peroxide

Question 8

An aromatic tertiary amine that initiate polymerization

Answer 8

Accelerator

Question 9

Increases shelf life by preventing spontaneous polymerization

Answer 9

Inhibitor

Question 10

Example of inhibitor

Answer 10

Hydro quinones

Question 11

Initially increases rate of polymerization

Answer 11

Methacrylic acid

Question 12

4 types of composite

Answer 12

1 conventional
2 micro-filled
3 hybrid
4 nano-filled

Question 13

Chemically cured composite

Answer 13

Conventional composite

Question 14

“Polishable composite”

Answer 14

Microfilled

Question 15

Inorganic filler content of conventional composite (%)

Answer 15

70-80%

Question 16

Inorganic filler content of micro-filled composite (%)

Answer 16

35-60%

Question 17

Inorganic filler content of hybrid composite (%)

Answer 17

75-85%

Question 18

2 type of hybrid composite

Answer 18

1 flowable (ampules)
2 packable (syringe)

Question 19

Diastema closure used for >2.5mm

Answer 19

Splints

Question 20

Contraindications of composite (4)

Answer 20

• habitual bruxism
• deep gingival prep
• poor moisture control
• large restoration

Question 21

The dimensional change of a material per unit change in temp

Answer 21

Linear coefficient of thermal expansion

Question 22

Properties of composite (7)

Answer 22

• LCTE
• water absorption
• wear resistance
• surface texture
• radiopacity
• modulus of elasticity
• solubility

Question 23

Stiffness of the material

Answer 23

Modulus of elasticity

Question 24

Acid echant used for composite

Answer 24

37% phosphoric acid

Question 25

4 types of light curing units

Answer 25

- quartz tungsten halogen - blue LED - argon laser - plasma arc

Question 26

Curing time using plasma arc curing light

Answer 26

9-10 secs

Question 27

Required distance between composite and light curing unit

Answer 27

2mm

Question 28

Used to measure the curing effectiveness of the unit

Answer 28

Radiometer

Question 29

Duration for etching (in secs)

Answer 29

15 secs

Question 30

Appearance after etching

Answer 30

Frosty appearance

Question 31

In etching, if contaminated with saliva, what do you do?

Answer 31

Re-etch for 5 secs

Question 32

White opaque appearance

Answer 32

Resin tags

Question 33

Components of bonding agent (3)

Answer 33

- etchant - primer - adhesive

Question 34

Component of bonding agent used as adhesive

Answer 34

EDTA (ethylene diamine tetracetic acid)

Question 36

Consist of a gelatinous surface layer of coagulated protein

Answer 36

Smear layer

Question 37

Primer that penetrates demineralized dentin & bond to the collagen network or layer

Answer 37

HEMA ( hydroxyethyl methacrylate)

Question 38

HEMA + adhesive = ?

Answer 38

Wet bonding technique

Question 39

Process by which 2 or more molecules of same substance combine to form a polymer

Answer 39

Polymerization

Question 40

Energy required for optimum polymerization of composite

Answer 40

16 Joules

Question 41

Most common available light curing intentisty

Answer 41

400-600mW/cm2

Question 42

What component of ZOE will inhibit polymerization if used with composite?

Answer 42

-

Question 43

Best used for finishing and polishing composite

Answer 43

Polishing disks

Question 45

True or false: Moist tooth surface will bond more effectively than dry or very wet tooth surface

Answer 45

True