Deck 6: Composites, glass Ionomers, and Compomers

Question 1

Which of the following is a direct-placement esthetic material?

A) Composite resin
B) Silver amalgam
C) Porcelain inlay
D) Full gold crown

Answer 1

Composite resin

Question 2

Which statement is correct about flowable composite resins?

A) They are useful for class I but not class V restorations.
B) They are useful as liners in large cavity preparations because they adapt to the preparation better than more viscous materials such as hybrid and packable composites.
C) They are high-viscosity,light-cured resins that may be lightly filled (about 40%)or more heavily filled (up to 70%).
D) They have a high elastic modulus,which allows them to cushion stresses created by polymerization shrinkage or heavy occlusal loads.

Answer 2

They are useful as liners in large cavity preparations because they adapt to the preparation better than more viscous materials such as hybrid and packable composites.

Question 3

The fillers used in composite resins are:

A) bis-GMAs.
B) inorganic silica particles.
C) urethane dimethacrylates (UDMAs).
D) low-molecular-weight monomers called TEGDMAs.

Answer 3

inorganic silica particles.

Question 4

Which of the following is correct regarding nanohybrid composite resins?

A) These are weak composites.
B) These composites cannot be polished to a high shine.
C) The shrinkage has been reduced from roughly 3% with earlier composites to less than 1% with some of the nanohybrids.
D) With more resin than previous generations,these composites shrink less when polymerized.

Question 5

What is the recommended curing time for the proximal box of a class II composite restoration?

A) 10 to 30 seconds
B) 20 to 40 seconds
C) 40 to 60 seconds
D) 60 to 80 seconds

Question 6

Which of the following are advantages of laboratory-processed composite restorations over directly placed composites?
1)The restoration is denser.
2)The restoration polymerizes more completely.
3)More stress is created internally on the composite and the walls of the cavity preparation.

A) 1,2,3
B) 1,2
C) 1,3
D) 2,3

Question 7

It is recommended to _____ to reduce sticking of the composite material to the placement instrument.

A) use a little of an unfilled resin
B) use a little of the bonding agent
C) use a specially coated instrument
D) wet the composite instrument with alcohol

Question 8

What type of restorative material is used for the atraumatic restorative treatment (ART)of caries?

A) Compomer
B) Conventional composite resin
C) Hybrid (resin-modified)ionomer
D) High-viscosity glass ionomer composite

Question 9

Which part of the tooth is generally closest to the dentin in color?

A) Body
B) Cervical
C) Incisal area of anterior teeth
D) Occlusal area of posterior teeth

Question 10

Which of the following is correct regarding polymerization shrinkage of composite resin restorations?

A) Microfills and flowables shrink less than hybrids and packables.
B) The greater the resin content of the composite,the less will be the shrinkage.
C) Recent research indicates that the composite resin material does not shrink toward the light.
D) When composite is placed and cured in a preparation that has two opposing walls,the composite will expand and push against the walls.

Question 11

Which of the following types of curing lights is currently the most popular?

A) Plasma arc (PAC)
B) Laser (initially argon laser)
C) Light-emitting diode (LED)
D) Halogen (quartz-tungsten-halogen,or QTH)

Question 12

The catalyst paste of a chemically cured composite resin contains _____ as an activator.

A) dimethacrylate
B) a tertiary amine
C) benzoyl peroxide
D) camphoroquinone

Question 13

During incremental addition of composite resin,how will each additional increment bond to the previously placed increment of composite?

A) If etchant is used between layers
B) If etchant and primer are used between layers
C) If etchant,primer,and bond agent are used between layers
D) If good isolation is maintained and no contaminants are introduced

Question 14

Which of the following is an advantage of composite resin versus amalgam?

A) Wear
B) Abrasion
C) Longevity
D) Thermal conductivity

Question 15

In general,it is recommended that light-cured composite be placed in increments no thicker than ____ mm.

A) 1.0
B) 2.0
C) 4.0
D) 8.0

Question 16

Which of the following is used to prepare the dentinal tooth surface for placement of glass ionomer cement?

A) 35% phosphoric acid
B) 10% polyacrylic acid
C) A rotary cutting instrument such as a diamond bur
D) Nothing;it bonds to calcium without surface preparation.

Question 17

For composite restorative materials,the greater the filler content,the _____ the coefficient of thermal expansion (CTE),and the greater the resin content,the _____ the CTE.

A) greater;greater
B) greater;lower
C) lower;greater
D) lower;lower

Question 18

Composite resins are composed mainly of an organic resin matrix and inorganic silica filler particles joined together by a _____ coupling agent.

A) silane
B) colloidal
C) surfactant
D) hydrophobic

Question 19

Nanohybrids have a particle size of _____ microns (mm).

A) 0.1 to 0.4
B) 310 to 100
C) 0.03 to 0.5
D) 0.005 to 0.020

Question 20

In the polymerization process for composite resins,an activator causes an initiator molecule to form a _____ that breaks one of the carbon-to-carbon double bonds to form a single bond and another free radical.

A) ketone
B) g-phase
C) eutectic
D) free radical

Question 21

Which procedures can glass ionomers be used for?

A) Sealants
B) Cements
C) Restorations
D) All of the above

Question 22

Match the items with the correct description below.
Nano composite

A)A light-cured,low-viscosity composite resin that contains fewer filler particles
B)An early generation of composite that contained filler particles ranging from 10 to 100 mm in diameter
C)A composite that contains all nano-sized fillers to enhance physical properties
D)A composite that contains both macrofill and microfill particles
E)A composite that contains very small filler particles averaging 0.04 mm in diameter

Question 23

What is the possible outcome of repeated low-level exposure to the blue curing light?

A) Cataract
B) Blindness
C) Detached retina
D) Macular degeneration

Question 24

Match the items with the correct description below.
Flowable composite

A)A light-cured,low-viscosity composite resin that contains fewer filler particles
B)An early generation of composite that contained filler particles ranging from 10 to 100 mm in diameter
C)A composite that contains all nano-sized fillers to enhance physical properties
D)A composite that contains both macrofill and microfill particles
E)A composite that contains very small filler particles averaging 0.04 mm in diameter

Question 25

What is the curing time for a curing light with a halogen bulb?

A) 10 to 15 seconds
B) 15 to 30 seconds
C) 20 to 40 seconds
D) Per manufacturer's instructions

Question 26

The use of two different restorative materials in the same restoration is referred to as what?

A) Veneer technique
B) Hybrid technique
C) Layered technique
D) Sandwich technique

Question 27

List the three different types of composite resins and describe how they each polymerize.

Question 28

Match the items with the correct description below.
Macrofilled composite

A)A light-cured,low-viscosity composite resin that contains fewer filler particles
B)An early generation of composite that contained filler particles ranging from 10 to 100 mm in diameter
C)A composite that contains all nano-sized fillers to enhance physical properties
D)A composite that contains both macrofill and microfill particles
E)A composite that contains very small filler particles averaging 0.04 mm in diameter

Question 29

What is the organic matrix of composite resins made up of?

A) BIS-GMA
B) Glass
C) Silica
D) Quartz

Question 30

Match the items with the correct description below.
Hybrid composite

A)A light-cured,low-viscosity composite resin that contains fewer filler particles
B)An early generation of composite that contained filler particles ranging from 10 to 100 mm in diameter
C)A composite that contains all nano-sized fillers to enhance physical properties
D)A composite that contains both macrofill and microfill particles
E)A composite that contains very small filler particles averaging 0.04 mm in diameter

Question 31

Match the items with the correct description below.
Microfilled composite

A)A light-cured,low-viscosity composite resin that contains fewer filler particles
B)An early generation of composite that contained filler particles ranging from 10 to 100 mm in diameter
C)A composite that contains all nano-sized fillers to enhance physical properties
D)A composite that contains both macrofill and microfill particles
E)A composite that contains very small filler particles averaging 0.04 mm in diameter

Question 32

Some composite resin materials give off heat when cured.What is this called?

A) Chemical reaction
B) Exothermic reaction
C) Thermal conductivity
D) None of the above

Question 33

To avoid shrinkage,how should composite resins be placed into a preparation?

A) In large increments
B) In small increments
C) The material does not shrink.

Question 34

List the advantages and disadvantages of glass ionomer cements.

Question 35

Which of the following materials is fluoride releasing?

A) Porcelain
B) Glass ionomer
C) Composite resin

Question 36

Which of the following composite resin materials would not be used in non-stress-bearing areas?

A) Macrofilled
B) Microfilled
C) Microhybrid

Question 37

What is the best way to take a patient's color/shade?

A) Using a shade guide
B) Moistening the teeth
C) Curing a small quantity to enamel
D) All are good choices.