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Dental Hygiene Quiz on Dental Materials, created by N N on 18/07/2017.

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Dental Materials

Question 1 of 35

1

A drop of water on a Popsicle is an example of:

Select one of the following:

  • Poor wetting (low contact angle)

  • Good wetting (high contact angle)

  • Good wetting (low contact angle)

  • Poor wetting (high contact angle)

Explanation

Question 2 of 35

1

The tightening of a guitar string is an example of which of the following stresses?

Select one of the following:

  • Compression

  • Torsion

  • Shear

  • Tension

Explanation

Question 3 of 35

1

The modulus of elasticity is an indication of what property of a material?

Select one of the following:

  • Resilience

  • Strength

  • Stiffness

  • Tension

Explanation

Question 4 of 35

1

Cooled Materials will contract, and heated materials will expand. A measurement of this change in volume in relation to change in temperature is called the coefficient of thermal expansion.

Select one of the following:

  • First statement is true; second statement is false.

  • First statement is false; second statement is true.

  • Both statements are true.

  • Both statements are false.

Explanation

Question 5 of 35

1

When a stress is induced in a material that is greater than the materials yield strength the stress is ____ proportional to the strain in the material does not return to its original shape.

Select one of the following:

  • Always

  • No longer

  • Equally

  • None of the above

Explanation

Question 6 of 35

1

Which formula defines the modulus elasticity?

Select one of the following:

  • Stress/strain

  • Stress2/strain

  • Strain/stress

  • 2 x stress/strain

Explanation

Question 7 of 35

1

An example of a physical property is:

Select one of the following:

  • Density

  • Strength

  • Stiffness

  • Setting reaction

Explanation

Question 8 of 35

1

A twisting force is termed:

Select one of the following:

  • Compression

  • Tension

  • Torsion

  • Shear

Explanation

Question 9 of 35

1

The ability of a material to dissolve in liquid is termed:

Select one of the following:

  • Viscosity

  • Water sorption

  • Solubility

  • Wetting

Explanation

Question 10 of 35

1

Elasticity is an example of which of the following properties?

Select one of the following:

  • Physical

  • Mechanical

  • Chemical

  • Biologic

Explanation

Question 11 of 35

1

The rate of heat flow through the material is referred to as:

Select one of the following:

  • Heat of fusion

  • Coefficient of thermal expansion

  • Heat capacity

  • Thermal conductivity

Explanation

Question 12 of 35

1

Jennifer is a practicing hygienist who goes to a nearby restaurant each day for lunch. She often orders a cola with ice and a bowl of homemade soup. As she eats and drinks, her composite restorations (tooth colored) and tooth structure are expanding and contracting at different rates. This change in volume or length of the materials due to the hot food and cold drink is referred to as:

Select one of the following:

  • Heat of fusion

  • Coefficient of thermal expansion

  • Heat capacity

  • Thermal conductivity

Explanation

Question 13 of 35

1

Fingernail polish remover has solvent properties as it will remove the polish from our fingernails. Another property polish remover has it is the tendency to evaporate. Fingernail polish remover can be said to have:

Select one of the following:

  • A higher vapor pressure

  • A low vapor pressure

  • No vapor pressure

  • And intermittent paper pressure

Explanation

Question 14 of 35

1

Match the properties with the procedure or situations. ____ is the force used to condense and amalgam in a preparation. A hardened cement having low _____ can firmly hold a patients gold crown in place for years in a wet environment. ____ is the term given to the increase of stress around defects within an object.

Select one of the following:

  • Solubility, compression, Viscosity

  • Compression, solubility, stress concentration

  • Stress concentration, compression, solubility

  • Compression, viscosity, stress concentration

Explanation

Question 15 of 35

1

Postage stamps are now self adhesive. The paper (stamp) is referred to as the ____ and the sticky material on the back of the stamp is termed the ____.

Select one of the following:

  • Adherend; adhesive

  • Adhesive; adherend

  • Adhesive; bonding agent

  • Adherents; biofilm

Explanation

Question 16 of 35

1

Kristen has orthodontic appliances, commonly known as braces. These include metal brackets directly bonded to the facial surfaces with the bonding material. One bracket breaks off, and the failure occurs within the bonding material. This type of failure is considered to be:

Select one of the following:

  • Adhesive

  • Adherend

  • Cohesive

  • Macromechanical

Explanation

Question 17 of 35

1

Orthophosphoric acid (enamel etchant) is commonly used in a ____ concentration

Select one of the following:

  • 27%

  • 30%

  • 37%

  • 47%

Explanation

Question 18 of 35

1

Why do primary teeth need to be etched longer than permanent teeth?

Select one of the following:

  • Compensates for potential behavioral management problems

  • The enamel is denser on primary teeth

  • The enamel rods are more regularly arranged than on permanent teeth

  • The enamel rods are less regularly arranged then on permanent teeth

Explanation

Question 19 of 35

1

Dentinal bonding systems function by way of:

Select one of the following:

  • Micromechanical bonding in secondary atomic bonds

  • Macromechanical bonding and secondary atomic bonds

  • Micromechanical bonding and primary atomic bonds

  • Macromechanical bonding and primary atomic bonding

Explanation

Question 20 of 35

1

The Dentin debris that is created when Dentin is cut or prepared by dental instruments is called:

Select one of the following:

  • Adhesive layer

  • Smear layer

  • Primer layer

  • Chelating agent

Explanation

Question 21 of 35

1

The use of bonding in dentistry serves all of the following functions except:

Select one of the following:

  • Reduction of recurrent caries

  • Retention of color in the restoration

  • Reduction of microleakage

  • Retention of restorations

Explanation

Question 22 of 35

1

An adhesive mechanism of a dentinal bonding system is a hybrid layer. It is composed of:

Select one of the following:

  • The smear layer and resin

  • Dentin primer and decalcified enamel

  • Resin and decalcified enamel

  • Resin and decalcified Dentin

Explanation

Question 23 of 35

1

The following are all historical fallacies about dentinal bonding except one. Which one is the exception?

Select one of the following:

  • composites irritate the pulp

  • Dentin should not be etched

  • The smear layer is dentinal debris

  • The smear layer should be left to protect the pulp

Explanation

Question 24 of 35

1

Which of the following cements are available in a single dose capsule much like that of silver amalgam filling material?

Select one of the following:

  • Polycarboxylate

  • Silicate

  • ZOE

  • Glass ionomer

  • Zinc phosphate

Explanation

Question 25 of 35

1

To dental cement that are used for caries control are:

Select one of the following:

  • ZOE and zinc phosphate

  • ZOE and polycarboxylate

  • Zinc phosphate in glass ionomer

  • Glass ionomer and polycarboxylate

  • Glass ionomer and ZOE

Explanation

Question 26 of 35

1

All of the following are true for ZOE except:

Select one of the following:

  • It releases fluoride

  • It lacks strength

  • It is an obtundent material

  • It protects the pulp

Explanation

Question 27 of 35

1

Which of the following cement is most soluble?

Select one of the following:

  • Glass ionomer

  • Zinc phosphate

  • ZOE

  • Polycarboxylate

Explanation

Question 28 of 35

1

One glass ionomer is next to slowly, the resulting mix is:

Select one of the following:

  • Thin

  • Thick

  • Lumpy

  • Granular

Explanation

Question 29 of 35

1

Cement are ____ soluble than the overlying restoration.

Select one of the following:

  • More

  • Less

  • Equally

  • None of the above

Explanation

Question 30 of 35

1

During mixing, which of the following cements should use as much of the area on the slab as possible to reduce the exothermic reaction?

Select one of the following:

  • Polycarboxylate

  • Glass ionomer

  • ZOE

  • Zinc phosphate

Explanation

Question 31 of 35

1

Which of the following dental materials promotes the formation of secondary Dentin?

Select one of the following:

  • Composite cements

  • Silicate Cements

  • Calcium hydroxide

  • Temporary cements

Explanation

Question 32 of 35

1

Which of the following is a common additive to glass powder, reduces melting temperature, and improve the flow of molten glass?

Select one of the following:

  • Quartz

  • Fluoride

  • Silicate

  • Oxides

Explanation

Question 33 of 35

1

The cement of choice for meeting ceramic restorations to tooth structure is

Select one of the following:

  • ZOE

  • Zinc phosphate

  • Polycarboxylate

  • Composite

Explanation

Question 34 of 35

1

The disadvantage, or drawback, of using polycarboxylate cement is:

Select one of the following:

  • Lack of strength

  • Ability to bond to tooth structure

  • Biocompatibility

  • Lack of sufficient clinical data for long-term use

Explanation

Question 35 of 35

1

ZOE maybe used for the following: temporary restorations, intermediate pieces, permanent restorations, looting temporary crowns, looting permanent crowns

Select one of the following:

  • Temporary restorations, intermediate bases, permanent restorations

  • Temporary restoration and intermediate bases

  • Temporary restorations, intermediate bases, looting temporary crowns

Explanation

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