Deck 3: Physical and Mechanical Properties of Dental Materials

Question 1

_____ time is the time permitted to manipulate the material in the mouth.

A) Mixing
B) Working
C) Initial set
D) Final set

Answer 1

Working

Question 2

Which of the following forms of matter has/have both shape and volume?
1)Solid
2)Liquid
3)Gas

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

Answer 2

1

Question 3

The stability of a solid is evaluated by noting:

A) its atomic mass and number.
B) whether or not it is a compound.
C) how hard the material is when set.
D) whether the molecules are arranged uniformly.

Answer 3

whether the molecules are arranged uniformly.

Question 4

Which of the following statements is true concerning desirable properties of dental materials?

A) The maximum amount of stress a material can withstand without breaking is known as the proportional limit.
B) Stiffer materials have a high modulus of elasticity.
C) Resilience is the ability of a material to resist fracture.
D) In most cases,metals tend to be brittle and ceramics tend to be ductile and malleable.

Question 5

If the molecules of a solid are arranged in a random form with no regular pattern,the solid is called:

A) thixotropic.
B) amorphous.
C) malleable.
D) ductile.

Question 6

Which of the following are considered to be therapeutic dental materials?

A) Partial and complete dentures
B) Fluorides and pit and fissure sealants
C) Fillings,inlays,crowns,bridges,and implants
D) Medicated bases and topical treatments for periodontal disease

Question 7

Of the following,which is not an application of a material's classification?

A) Longevity
B) Utilization
C) Fabrication
D) All of these are correct.

Question 8

Which of the following is not a primary bond?

A) Hydrogen
B) Covalent
C) Metallic
D) Ionic

Question 9

The higher the viscosity,the greater is a liquid's ability to resist flow.Usually,the viscosity of liquids increases as the temperature increases.

A) Both statements are true.
B) Both statements are false.
C) The first statement is true;the second statement is false.
D) The first statement is false;the second statement is true.

Question 10

Which of the following is true concerning initial and final setting times?

A) Moisture and pressure controls are frequently important during the initial set.
B) The final set always occurs while the patient is still in the dental office.
C) The material must not be disturbed through the end of the final set.
D) Once a material has reached the initial set,it will not fracture.

Question 11

Which of the following is an example of a secondary rather than primary bond?

A) Ionic bond
B) Metallic bond
C) Covalent bond
D) Hydrogen bond

Question 12

Metals that can withstand dimensional change without breaking are:

A) tough.
B) ductile.
C) resilient.
D) malleable.

Question 13

Dental plaster begins with _____ components.

A) water and powder
B) liquid and powder
C) paste and liquid
D) paste and paste

Question 14

Which of the following is the hardest material?

A) Enamel of a tooth
B) Cementum of a tooth
C) Cast gold restorative material
D) Composite resin restorative material

Question 15

What is the maximum amount of stress a material can take before breaking?

A) Ultimate capacity
B) Ultimate strength
C) Material hardness
D) Maximum elasticity

Question 16

Which type of bond occurs when two atoms share electrons in their outer shell,creating full shells for both?

A) Ionic bond
B) Covalent bond
C) Metallic bond
D) Hydrogen bond

Question 17

What is the measure of the weight of a material as compared with its volume?

A) Density
B) Viscosity
C) Hardness
D) Resistance

Question 18

Dual set materials utilize _____ setting reactions.

A) both light-activated and chemical
B) light-activated but not chemical
C) chemical setting but not light-activated
D) neither light-activated nor chemical

Question 19

In general,_____ temperature and _____ humidity will accelerate the reaction of the material.

A) high;high
B) high;low
C) low;high
D) low;low

Question 20

Which of the following is an example of a direct restorative material?

A) Porcelain inlay
B) Cast gold crown
C) Ceramic implant abutment
D) Silver dental amalgam restoration

Question 21

List and describe the three types of primary bonds.

Question 22

What will happen if expired materials or improperly stored materials are used?

A) Render the material ineffective
B) Be of little consequence
C) Cause a toxic reaction

Question 23

List and describe the three different classifications of dental materials.

Question 24

Altering the set ratios of a material for any purpose will do what?

A) Make the material harder
B) Produce adverse results
C) Speed up the initial set
D) Have little significance

Question 25

Match the items with the correct description below.
Stiffness

A)Resistance to deformation
B)The greatest stress a structure can withstand without permanent deformation
C)The resistance of a solid to penetration
D)The maximum amount of stress a material can withstand without breaking
E)The ability of a material to resist fracture

Question 26

Match the items with the correct description below.
Ultimate strength

A)Resistance to deformation
B)The greatest stress a structure can withstand without permanent deformation
C)The resistance of a solid to penetration
D)The maximum amount of stress a material can withstand without breaking
E)The ability of a material to resist fracture

Question 27

Match the items with the correct description below.
Initial set time

A)Begins when the material can no longer be manipulated in the mouth
B)When the material has reached its ultimate state
C)The amount of time the auxiliary has to bring the components together into a homogenous mix
D)The time permitted to manipulate the material within the mouth

Question 28

Match the items with the correct description below.
Final set time

A)Begins when the material can no longer be manipulated in the mouth
B)When the material has reached its ultimate state
C)The amount of time the auxiliary has to bring the components together into a homogenous mix
D)The time permitted to manipulate the material within the mouth

Question 29

Match the items with the correct description below.
Hardness

A)Resistance to deformation
B)The greatest stress a structure can withstand without permanent deformation
C)The resistance of a solid to penetration
D)The maximum amount of stress a material can withstand without breaking
E)The ability of a material to resist fracture

Question 30

What is the reaction initiated when a catalyst and a base are mixed together?

A) Chemical
B) Physical
C) Dual
D) All are possible reactions.

Question 31

Match the items with the correct description below.
Mixing time

A)Begins when the material can no longer be manipulated in the mouth
B)When the material has reached its ultimate state
C)The amount of time the auxiliary has to bring the components together into a homogenous mix
D)The time permitted to manipulate the material within the mouth

Question 32

Match the items with the correct description below.
Working time

A)Begins when the material can no longer be manipulated in the mouth
B)When the material has reached its ultimate state
C)The amount of time the auxiliary has to bring the components together into a homogenous mix
D)The time permitted to manipulate the material within the mouth

Question 33

Match the items with the correct description below.
Proportional limit

A)Resistance to deformation
B)The greatest stress a structure can withstand without permanent deformation
C)The resistance of a solid to penetration
D)The maximum amount of stress a material can withstand without breaking
E)The ability of a material to resist fracture

Question 34

Which of the following would be considered an indirect placement restorative material?

A) Gold
B) Gold foil
C) Amalgam
D) Composite resin

Question 35

A _____ material will flow more easily under mechanical pressure.

A) viscous
B) thixotropic
C) resistance
D) therapeutic

Question 36

Match the items with the correct description below.
Toughness

A)Resistance to deformation
B)The greatest stress a structure can withstand without permanent deformation
C)The resistance of a solid to penetration
D)The maximum amount of stress a material can withstand without breaking
E)The ability of a material to resist fracture