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

19
Q

number of ways lattice exist

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
Smaller angle
greater wetting
26
theta equal to 180
no wetting
27
ideal adhesive
low surface tension and adheres with high energy
28
High energy
balls up
29
low energy
spreads flat
30
long range order
crystak
31
number of crystal structures
7
32
no long range order
amorphous