Exam 1- Biomaterials Flashcards

1
Q

sealants, flouride, chlorohexidine

A

preventative dent materials

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2
Q

replace, repair, or rebuild

A

restorative materials-direct (in mouth) and indirect (out of)

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3
Q

Auxillary materials

A

used to form, do not become a part of device (i.e. gypsum and dental wax)

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4
Q

composite material

A

mix of 2 of the 3 (metal, ceramic, or polymer)

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5
Q

example of composites

A

glass/resin/silica

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6
Q

mouth is usually ___ temp

A

warmer than RT

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7
Q

Class I device

A

low risk; good manufacturing

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8
Q

Class II

A

meet performance standards; most

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9
Q

Class III

A

requires data to support; for newer materials

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10
Q

Sets standards and regulations for america

A

ADA-1859

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11
Q

set the international standard

A

ISO

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12
Q

electrical insulators

A

covalent bonds-electrons don’t move

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13
Q

Metallic Bonds

A

Sharing of e- between two solids; electrons are free thus they are electrical and thermal conductors

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14
Q

Interatomic Primary Bonds

A

Metals are able to deform due to rearrangement of electric forces whereas ionic solids would have repulsive forces that cause cracks to form

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15
Q

Amorphous

A

irregular arrangement of atoms with no long range order upon solidification (glass and many polymers)

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16
Q

Crystal

A

A regular arrangement of atoms that exhibit long range order upon solidification (most metals and some ceramics)

17
Q

Atomic Crystal Structure

A

Depends on length of axis connecting adjacent atoms and angles between them

18
Q

most dental materials are

A

cubic

19
Q

number of ways lattice exist

A

14

20
Q

adhesion

A

force of attraction between molecules on two different

21
Q

cohesion

A

force of attraction within a material

22
Q

undercuts

A

mechanical bonding

23
Q

Phosporic acid

A

leaves rough surface for bonding

24
Q

wetting

A

degree an adherent will spread on a surface-measured by contra angle

25
Q

Smaller angle

A

greater wetting

26
Q

theta equal to 180

A

no wetting

27
Q

ideal adhesive

A

low surface tension and adheres with high energy

28
Q

High energy

A

balls up

29
Q

low energy

A

spreads flat

30
Q

long range order

A

crystak

31
Q

number of crystal structures

A

7

32
Q

no long range order

A

amorphous