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Dental Hygiene > Dental Materials Test 1 > Flashcards

Dental Materials Test 1 Flashcards

0
Q

Amount of force applied to a specific area

A

Stress=force/area

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1
Q

What base is still used: stimulate dentin formation and ph raises as it dissolves

A

calcium hydroxide

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2
Q

Internal rearrangement of atoms to adjust to the stress-deformation results

A

Strain=deformation/length

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3
Q

Forces on object directed away from each other - stretched or elongated…ability of an object to resist pulling

A

Tensile

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4
Q

Resistance in the material to the external force - ability to resist pushing

A

Compressive

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5
Q

Ability to resist tearing - forces directed parallel to each other. Occurs when one portion of a structure is forced to slide by another portion (i.e.. scissors)

A

Shear

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6
Q

Stiffness of material, maximum stress w/o permanent deformation. Material can’t regain its size and/or shape

A

Elastic limit - proportional limit

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7
Q

Point just before fracture

A

Ultimate strength

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8
Q

Ability of material to be drawn into a wire

A

Ductility = elongation

Low ductility = brittleness

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9
Q

Ability to be hammered or rolled into thin sheets without fracture- compression

A

Malleability

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10
Q

Energy necessary to cause permanent deformation

A

Resilience

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11
Q

Ability of material to resist fracture

A

Toughness

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12
Q

Gradual permanent change in dimension that occurs in an object due to constant loading
Flow after set (amalgam)

A

Creep

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13
Q

Resistance of material to flow

A

Viscosity

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14
Q

Some materials have a high viscosity but change w/pressure (mixing)…impression materials change thru manipulation

A

Thixotropic

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15
Q

Depth of an indentation made with a steel ball- composites ↕️

A

Rockwell (RHN) hardness

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16
Q

Measuring the length of a diagonal made with a diamond indenter- metals and porcelain ↔️

A

Knoop (KHN) hardness

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17
Q

The repeated application of stress to an object causing tiny cracks to be generated within the structure until failure occurs

A

Fatigue

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18
Q

Pt ed. for 12 year old who is going to play field hockey….

A

Mouthguard

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19
Q

How do cements look on an X-ray?

A

Opaque

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20
Q

Dental cement can be used as a base…

  • Can it protect pulp?
  • Adequate compressive strength?
  • Is it a poor conductor of temp
A

Yes all of above

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21
Q

Most conservative tx for 43 yr old with extensive internal stains- finances not an issue

A

Veneers

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22
Q

New material should have hardened when light passed, but didn’t… you would say material did not what?

A

Cure

23
Q

Which type of composite has the lowest viscosity

A

Flowable

24
Q

Filler size and polishability, easier to polish what?

A

Microfilled

25
Q

What releases Fluoride?

A

Glass ionomer

26
Q

What function does kaolin perform in porcelain

A

Causes parameters to be cohesive when wet and it adds pigment

27
Q

Bases help to do what with thermal conductivity?

A

Limit/eliminate

28
Q

What do varnishes do?

A

Seal dentin tubules

29
Q

What is the best base to use in a deep cavity prep

A

calcium hydroxide

30
Q

Don’t use ZOE under a material that you want to what? (i.e. composite)

A

polymerize

31
Q

Copalite is to what?

A

Seal dentinal tubules

32
Q

What is created with high speed, debris of enamel and dentin

A

Smear layer

33
Q

Pt with history of sensitive teeth, requires amalgam restoration of max molar which base material may be the best choice

A

glass ionomer

34
Q

Base metal alloys are utilized to make what?

A

Crowns, bridges, PFM

35
Q

Can glass ionomers be utilized as cements and restorations and bases?

A

Yes

36
Q

Which are characteristics of glass ionomers?

A

release fluoride, bond to composite, enamel and dentin

37
Q

Which element is most responsible for reacting with mercury causing amalgam to set up?

A

Silver

38
Q

Pt. comes in with amalgam of equivalent age in 2 first molars, amalgam in #19 shows more marginal breakdown than the one in #30?

A

Both of these answers are correct

  • amalgam in 19 is less corrosion resistant than 30
  • amalgam in tooth 19 has higher creep than 30
39
Q

Advantage of amalgam…

A

Easy to insert, manipulate, resists fracture

40
Q

Corrosion effects the Cavo surface margin

A

True..(where amalgam and tooth meets)

41
Q

What percent of gold is in 18 k gold?

A

75%

42
Q

Compared to pure gold, dental gold alloys are:

A

Harder

43
Q

Which type of porcelain is used in a porcelain fused to metal crown?

A

Low fusing (if it were high fusing it would melt the metal that has already been built on the prep. Tooth)

44
Q

As a metal restoration ages micro-leakage does what?

A

Decreases because of the process corrosion (self seals)

45
Q

Pt presents with well defined very red scalloped area along gingival margin, adjacent to base metal crown which of the following is not a cause…
​-sub gingival crown margin
​-nickel allergy
​-galvanic reaction

A

Galvanic reaction

46
Q

What restorations can be placed to provide healing time

A

ZOE

47
Q

How can mercury enter body?

A

Inhaling, ingestion, across skin

48
Q

Which setting phase of amalgam adds strength

A

gamma 1

49
Q

Which phase is most detrimental

A

gamma 2​

50
Q

Similar to a filling, but indirect, contained within cusps, cemented

A

Inlay

51
Q

Indirect restoration on the occlusal surface, includes a cusp, cemented or bonded

A

Onlay

52
Q

Considered color name

A

Hue

53
Q

Lightness or darkness of a color (hue)

A

Value

54
Q

Vividness or strength of a color or hue (difference between 1 or 2 coast of paint)

A

Chroma

55
Q

The way the light is affected when entering a substance

A

Translucency

56
Q

Components of porcelain

A

Combo of Kaolin, feldspar, and quartz…porcelain is fired whereas ceramic is machine milled.

Dental Hygiene (2 decks)

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