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National Board > Dental Materials > Flashcards

Dental Materials Flashcards

1
Q

chemical attraction between unlike molecules

A

adhesion

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2
Q

chemical attraction between like molecules

A

cohesion

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3
Q

index which indicates how one material reacts to temperature extremes in relation to another

A

Coefficient of thermal expansion

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4
Q

force at which a material breaks under pressure

A

compressive strength

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5
Q

slow dimensional change caused by compression

A

creep

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6
Q

ability to undergo change of form without breaking

A

ductility

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7
Q

materials ability to recover its initial shape after undergoing force

A

elasticity

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8
Q

electrical current generated by dissimilar metals in an acidic environment

A

galvanism

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9
Q

process of gelling (solidification by cold)

A

gelation

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10
Q

volumetric weight of one cubic cm or mm of water

A

gram

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11
Q

absorption of a solvent by a gel

A

imbibition

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12
Q

materials capacity to be shaped by force or pressure

A

malleability

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13
Q

linking, branching, or cross linking of smaller molecules

A

polymerization

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14
Q

force at which material cannot return to its original shape

A

proportional limit

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15
Q

contraction of a gel due to loss of a solvent

A

syneresis

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16
Q

force need to stretch material to point of fracture

A

tensile strength

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17
Q

resistance to flow

A

viscosity

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18
Q

change a materials components its properties change

A

truism

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19
Q

Mat - an alloy of mercury with silver, copper, tin and zinc

A

amalgam

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20
Q

Mat - added to amalgam to minimize corrosion (gamma 2 phase eliminated)

A

copper

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21
Q

polish - amalgam and gold

A

tin oxide

22
Q

polish - for composites

A

diamond

23
Q

used to SEAL dentin to MEDICATE dental pulp

A

liners

24
Q

liner that stimulates reparative dentin formation

A

calcium hydroxide

25
Q

used to provide thermal INSULATION or mechanical PROTECTION for dental pulp

A

bases

26
Q

cement - exothermic reaction on mixing

A

zinc

27
Q

cement - binds to dentin, thermal expansion, class V restorations

A

glass ionomer

28
Q

cement - temporary, orange solvent used to clean contaminated instruments

A

ZOE - zinc oxide eugenol

29
Q

types of impression materials (2)

A

rigid - inelastic

flexible - elastomeric (aqueous/non-aqueous)

30
Q

Mat - flexible, aqueous, undergoes physical reaction; temp dependent

A

Hydrocolloid (agar)

31
Q

Mat - flexible, aqueous, undergoes chemical reaction; Not temp dependent- but temp speeds or slows setting, need for fluff

A

Irreversible Hydrocolloid (alginate)

32
Q

Mat - flexible, non-aqueous, unstable in presence of moisture

A

polyether rubber

33
Q

Mat - flexible, non-aqueous, addition reaction silicone

A

vinylpolysiloxane

34
Q

Mat - primarily made of paraffin, used to modify the shape of impression tray and cushion braces

A

Utility wax

35
Q

Leading cause of implant failure

A

mobility - due to inadequate bone, lack of osseointegration, peri-implantitis

36
Q

Active ingredient in Tartar control toothpaste; leading cause of dentinal hypersensitivity

A

pyrophosphate

37
Q

Active ingredient in Gum care toothpaste; antimicrobial agent

A

triclosan

38
Q

Active ingredient in Desensitization toothpastes (3)

A

potassium nitrate, sodium citrate, strontium chloride

39
Q

Highly effective Desensitizers professionally placed (2)

A

potassium oxalate, fluoride varnish

40
Q

Active ingredient in Vital bleaches (home bleach) (2)

A

carbamide peroxide, hydrogen peroxide

41
Q

GV Black Class 1

A

pits and fissures

42
Q

GV Black Class 2

A

posterior proximals

43
Q

GV Black Class 3

A

anterior proximals

44
Q

GV Black Class 4

A

anterior proximals including incisal edge

45
Q

GV Black Class 5

A

facial or lingual cervical third

46
Q

GV Black Class 6

A

cusp tips and incisal edges

47
Q

Mat - added to non-metal restorative materials to appear radiopaque in X-rays (2); if not added X-ray will appear radiolucent and look like decay

A

barium, strontium

48
Q

amount of time used to etch

A

20 seconds

49
Q

time before stone cast is removed from an alginate impression

A

30-60 minutes

50
Q

Brinell and Knoop test used to determine

A

hardness

National Board (7 decks)

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