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Dental Materials > Final study, all odds. > Flashcards

Final study, all odds. Flashcards

1
Q

In the United States, standards for dental material are developed and administered by the:

A

ADA

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2
Q

An amalgam restoration located on the gingival third of tooth #3 would be a class ____ restoration.

A

Class V restoration

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3
Q

When the temperature changes in the mouth, the teeth and most restorative materials expand and contract by the same amount. No leakage occurs around the restoration.

A

Both statements are false

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4
Q

Which of the following restorations are utilized when a substantial amount of a tooth is missing?

A

Crown

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5
Q

If a restoration is fabricated on a replica (positive reproduction) of a patient’s teeth, it is referred to as a:

A

Cast

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6
Q

Medical devices are grouped into three categories according to Medical Device Amendment of 1976. Which class of devices is most regulated?

A

Class III

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7
Q

The molecules found in a pane of glass can be best described as:

A

Amorphous solid, having short-range order

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8
Q

What type of bond is formed when the electrons are shared by all the atoms that make up that object and may be thought of as “positive cores” in a “cloud of negative mobile valence electrons”?

A

Metallic

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9
Q

A dental polymer with many cross-links as compared to one with no cross-links would be a dental material that is:

A

Stiff and strong

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10
Q

When the shared electrons of a covalent bond are not shared equally, and one of the bonded atoms is partially positive and the other is partially negative, a ______ is formed.

A

Permanent dipole

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11
Q

A mixture of two liquids that do not blend together to form one liquid is termed a (an):

A

Emulsion

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12
Q

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

A

Good wetting (low contact angle)

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13
Q

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

A

Stiffness

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14
Q

When a stress is induced in a material that is greater than the material’s yield strength, the stress is _____ proportional to the strain, and the material does not return to its original shape.

A

No longer

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15
Q

An example of a physical property is:

A

Density

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16
Q

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

A

Solubility

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17
Q

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

A

Thermal conductivity

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18
Q

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

A

A high vapor pressure

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19
Q

A hardened cement having “low” _______ can firmly hold a patient’s gold crown in place for years in a wet environment.

A

Solubility

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20
Q

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

A

Adherend, adhesive

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21
Q 
Order steps of the acid-etching process and restoration placement:
Clean surface is rinsed with water
Etched surface is rinsed with water
Bonding resin is applied
Enamel is cleaned with pumice
Cleaned surface is dried with air
Etched surface is dried with air
Restorative material is applied
Etchant is applied
A
  1. Enamel is cleaned with pumice
  2. Clean surface is rinsed with water
  3. Cleaned surface is dried with air
  4. Etchant is applied
  5. Etched surface is rinsed with water
  6. Etched surface is dried with air
  7. Bonding resin is applied
  8. Restorative material is applied
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22
Q

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

A

The enamel rods are less regularly arranged than on permanent teeth.

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23
Q

The “dentin debris” that is created when dentin is cut or prepared by dental instruments is called:

A

Smear layer

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24
Q

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

A

Resin and decalcified dentin

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25
Q

One problem with polymers is their high coefficients of thermal expansion. These coefficients can be ___ to ___ times greater than that of tooth structure.

A

2 to 10

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26
Q

What advantage do microfilled composites have compared to macrofilled composites?

A

Smooth and lustrous polished surface

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27
Q

A specific amount of composite (thickness) that is cured by a light source is termed:

A

Depth of cure

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28
Q

The _______ composite restorative materials are those with a lower viscosity (decreased filler) to aid in placement.

A

Flowable

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29
Q

A combination of a pit and fissure sealant and a composite restoration is termed:

A

Preventive resin restoration

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30
Q

Thermal expansion for microfill composite restorative material is considered to be:

A

Poor

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31
Q

Composite materials that polymerize using light activation are:

A

Supplied as a single paste

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32
Q

Which of the following best describes microfill composite materials?

A

Polishability is very good, strength is low

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33
Q

Which of the following elements is used in the highest amount in an amalgam restoration?

A

Mercury

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34
Q

The elements composing the gamma-two (y2) phase (the weakest and most corrosion-prone phase) of the amalgam reaction are:

A

Tin and mercury

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35
Q

Control of the mercury content during mixing and condensing of amalgam must be carefully considered because:

A

The lower the mercury content, the higher the strength and the lower the marginal breakdown

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36
Q

The manufacturers of dental amalgam control all of the following except:

A

Proper trituration technique

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37
Q

In the low-copper or traditional amalgam reaction, tin reacts with mercury. In the high-copper amalgam reaction, tin reacts with:

A

Copper

38
Q

Ashley was condensing an amalgam during lav and she noticed that the triturated amalgam had a softer, “mushy” feel. What type of alloy did she most likely use in the mixed amalgam?

A

Spherical

39
Q

Amalgam may be used for a variety of restorative procedures. ALL of the following pertain to the use of amalgam, EXCEPT:

A

Restoring Class I, II, IV, and V caries

40
Q

The use of gold foil is limited to small restorations because of its:

A

Low strength compared to other restorative materials

41
Q

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

A

Glass ionomer

42
Q

All of the following are true for ZOE EXCEPT:

A

It releases fluoride

43
Q

When glass ionomer is mixed too slowly, the resulting mix is:

A

Thick

44
Q

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

A

Zinc phosphate

45
Q

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

A

Fluoride

46
Q

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

A

Lack of strength

47
Q

Alginate impression material is:

A

Easy to use

48
Q

Dr. Jones requested that you mix alginate and take an impression. While measuring the water, you got involved in conversation and did not notice how warm it was. This oversight will:

A

Shorten gelation time

49
Q

The brown paste used in rubber base is called the:

A

Accelerator

50
Q

Which of the following is an example of an inelastic impression material?

A

ZOE impression paste

51
Q

The popularity of agar impression material is limited by the:

A

Need for special equipment

52
Q

Addition silicones are the most popular type of rubber impression materials. The reason for this is cost.

A

The first statement is true; the second is false

53
Q

Mrs. Smith has not been to the dentist for several year. It was found that she needed extensive restorative treatment, to which she agreed. You were asked to take impressions as the first step of her care. The impression material of choice would be:

A

Alginate

54
Q

Which of the following impression material set by physical means?

A

Agar

55
Q

The desirable strength of gypsum materials is ______ related to the amount of water used.

A

Directly

56
Q

The gypsum material known as “high-strength stone” may also be referred to as:

A

Improved stone

57
Q

To make a correct mix for dental stone when using 50 g of powder, the amount of water would be approximately:

A

14 to 15 ml

58
Q

Decreasing the setting time of a dental material results in a product that:

A

Will set faster

59
Q

When excess water is not present in a gypsum product, it is known as the:

A

Dry strength

60
Q

Initial and final setting times of gypsum can be determined with the use of Gilmore needles. A practical, easy method to determine final setting time in a dental office would be to:

A

Attempt to penetrate the material with the metal spatula.

61
Q

If a mold that is created for investing and casting does not ________ to compensate for the action of the metal alloy, the casting will not fit.

A

Expand

62
Q

Porcelain is “best suited” for which of the following?

A

Veneers on anterior teeth

63
Q

Which of the following waxes is hard, leaves no burnout residue, and has a higher melting temperature?

A

Inlay

64
Q

Identify the correct sequence in the centrifugal casting process.

A

Add sprue to pattern, place in crucible former, invest, and then cast

65
Q

The term used to define the process of firing porcelain powder to become a solid is:

A

Sintering

66
Q

Which of the following is considered to be a fixed indirect restoration?

A

Onlay

67
Q

Another name for a provisional restoration is a ___________ restoration.

A

Temporary

68
Q

An advantage of bonding porcelain to metal is:

A

A precise fit of the metal

69
Q

The term used when the denture teeth are set in wax is:

A

Denture setup

70
Q

Heat-activated acrylic resin systems are very similar to chemically activated systems. The major difference (or exception) is:

A

No chemical activator is present in the liquid of heat-activated systems

71
Q

Partial denture frameworks usually include:

A

Clasps, connectors, and mesh

72
Q

Mandibular dentures are easier to wear than maxillary. Saliva helps to improve the suction needed to hold a denture in place.

A

The first statement is false; the second statement is true

73
Q

The acrylic resin of a partial denture is processed the same way as a complete denture EXCEPT:

A

The acrylic resin must flow through and around the mesh of the framework.

74
Q

The type of implant that involves cutting a hole into the alveolar bone and then pressing or screwing the implant is called:

A

Endosseous

75
Q

To ensure longevity and function of the implant, the patient is responsible for:

A

Plaque control

76
Q

All of the following conditions are contraindications for implant placement except:

A

Recurrent caries

77
Q

A patient who has a very small, or essentially no mandibular ridge, is said to have a (an):

A

Atrophic edentulous mandible

78
Q

The prosthodontic phase of implant treatment involves the placement of several “parts” or attachments. A patient who has completed the surgeries and restorative care would receive, in order:

A

IAcyCr

Implant, Abutment, Cylinder, Crown

79
Q

Which type of abrasive looks like a grayish-black sand and is sometimes called “corundum”?

A

Emery

80
Q

Which abrasive is used as a slurry to polish amalgam restorations and is also called calcium carbonate?

A

Whiting

81
Q

All of following factors affect the rate of abrasion except one:

A

Bonded and coated abrasives

82
Q

An example of a “vehicle” to be used with powders would be:

A

Glycerin

83
Q

During routine polishing with pumice, _______um of the fluoride-rich layer can be removed.

A

3-4

84
Q

Which of the following is harder than enamel?

A

Pumice

85
Q

The most frequently used abrasive in dentifrices is:

A

Silica

86
Q

Mrs. Smith presents for her prophylaxis appointment after a year, rather than the 6 month prescribed time. She has tobacco stain on the lingual surfaces of her natural teeth, two gold alloy crowns, and several esthetic restorations. Which combination of cleaning/polishing agents should be chosen?

A

Traditional prophy paste, tin oxide, and a polishing agent for esthetic restorations

87
Q

The term “nonvital” may be used to describe a tooth that has:

A

Been treated with a root canal procedure, a necrotic pulp, and no pulp tissue in the pulp cavity (all of the above)

88
Q

Which of the following statements is the most accurate?

A

Hydrogen peroxide decomposes into water and free radicals of oxygen

89
Q

Teeth with a moderate degree of _____ are the most difficult to successfully whiten.

A

Tetracycline stain

90
Q

Which of the following is the most common esthetic procedure in dentistry?

A

Whitening

91
Q

When should a bleached tooth be restored with a composite restoration?

A

1-2 weeks

92
Q

An aqueous cleaning technology used in pre-whitening and touch up whitening is dispensed in a :

A

Swab

Dental Materials (1 decks)

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