2011 final

Question 1

Which of the following categories of information would generally be considered to provide the highest level of evidence to support clinical practice decisions?

Answer 1

A systematic review of multiple randomized clinical trials

Question 2

What is the optimum region of application for the air/gas torch flame to melt alloy ingots for centrifugal casting?

Answer 2

At the tip of the reducing zone

Question 3

Which of these is a hydrophilic primer coupling agent commonly found in current dentin bonding systems?

Answer 3

HEMA

Question 4

If a manufacturer forgot to use silane in the production of a microfilled composite resin, what would be the result?

Answer 4

Increase in crack propagation

Question 5

The “C-Factor” in a composite resin restoration refers to the

Answer 5

Ratio of bonded composite surfaces to unbounded composite surfaces

Question 6

Approximately how thick is the hybrid zone in dentin created by current bonding systems?

Answer 6

3 microns

Question 7

Compared to conventional amalgams, high-copper dental amalgams exhibit…

Answer 7

Lower creep

Question 8

According to best management practices for dental amalgam waste, which of the following should be placed in biohazard waste receptacles for incineration?

Answer 8

Contact amalgam scrap
Used amalgam capsules
Amalgam debris from chairside traps
Two of the above
*None of the above*

Question 9

An ideal elastic material with no viscous component has which of the following properties?

Answer 9

Strain will be completely reversed upon removal of stress

Question 10

Which of the following color properties should be changed if the dentist wants increase the intensity of the specific color of a porcelain crown?

Answer 10

Chroma

Question 11

Over-trituration of dental amalgam alloy and mercury causes…

Answer 11

Less working time

Question 12

Which of the following properties would provide the best indication of a new and unused complete denture’s resistance to fracture if it is dropped and hits the lab porcelain tile floor?

Answer 12

Impact strength

Question 13

Intertubular dentin is not normally found in which of the following?

Answer 13

Peritubular dentin

Question 14

Which of the following pairs of materials exhibits the best wetting?

Answer 14

Etched enamel and polymer-based occlusal sealants

Question 15

To demonstrate that a material is ductile, the material must be deformed in excess of its

Answer 15

Proportional limit

Question 16

The bonding system category abbreviated [EP]+B eliminates the need for

Answer 16

Use of an etching gel

Question 17

Why is dentin kept moist just prior to the priming phase of dental bonding procedures?

Answer 17

To promote formation of a hybrid layer

Question 18

The dispersed phase of microfilled composite resins usually consists mostly of

Answer 18

Colloidal silica

Question 19

If dental materials A and B have the same resilience value, which of the following statements is correct?

Answer 19

The toughness values of A and B may be the same

Question 20

A linear polymer chain that is made from ethyl methacrylate and butyl methacrylate monomers is made by the process known as

Answer 20

Co-polymerization

Question 21

Compared to dentin, poly-(methyl methacrylate) has a high value of

Answer 21

Linear thermal expansion

Question 22

Which of the following explains why gold and platinum tend to resist corrosion? Both have relatively high…

Answer 22

Positive reduction potentials

Question 23

The “Gamma-1” phase of set dental amalgam consists of which of the following?

Answer 23

Silver-mercury

Question 24

In comparison to typical microfilled composite resins, typical microhybrid composite resins have lower values of

Answer 24

Polymerization shrinkage

Question 25

The difference between homogeneous microfilled composites and heterogeneous microfilled composites is that heterogeneous microfilled composites contain

Answer 25

Pre-cured composite particles

Question 26

Which of the following properties would a material exhibit above its glass transition temperature compared to below its glass transition temperature?

Answer 26

Increased permanent deformation

Question 27

To provide the best visual match between a porcelain veneer and an adjacent natural tooth in the widest range of lighting conditions, both the veneer and the tooth should exhibit

Answer 27

Isomerism and fluorescence

Question 28

Which of the following histologic components are found in both enamel and dentin?

Answer 28

Hydroxyapatite crystals

Question 29

According to the Sturdevant text, what is the mean size range of filler particles in typical microfilled composite resins?

Answer 29

.01 – 0.1 microns

Question 30

Which of the following restorations can be either a direct or an indirect restoration?

Answer 30

Composite resin restoration

Question 31

Which of the following components are present in both conventional dental amalgam alloy powder and high-copper dental amalgam alloy powder?

Answer 31

gamma

Question 32

During polymerization of methyl methacrylate in a light-activated system, which of the following molecules is the initial source of free radicals?

Answer 32

Camphorquinone

Question 33

The requirement to have a MSDS (Material Safety Data Sheet) for materials used in the dental office is mandated by

Answer 33

OSHA

Question 34

Which of the following would create a smear layer on dentin?

Answer 34

Cutting with a diamond bur