Exam 1- Biomaterials

Question 1

sealants, flouride, chlorohexidine

Answer 1

preventative dent materials

Question 2

replace, repair, or rebuild

Answer 2

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

Question 3

Auxillary materials

Answer 3

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

Question 4

composite material

Answer 4

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

Question 5

example of composites

Answer 5

glass/resin/silica

Question 6

mouth is usually ___ temp

Answer 6

warmer than RT

Question 7

Class I device

Answer 7

low risk; good manufacturing

Question 8

Class II

Answer 8

meet performance standards; most

Question 9

Class III

Answer 9

requires data to support; for newer materials

Question 10

Sets standards and regulations for america

Answer 10

ADA-1859

Question 11

set the international standard

Answer 11

ISO

Question 12

electrical insulators

Answer 12

covalent bonds-electrons don’t move

Question 13

Metallic Bonds

Answer 13

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

Question 14

Interatomic Primary Bonds

Answer 14

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

Question 15

Amorphous

Answer 15

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

Question 16

Crystal

Answer 16

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

Question 17

Atomic Crystal Structure

Answer 17

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

Question 18

most dental materials are

Answer 18

cubic

Question 19

number of ways lattice exist

Answer 19

14

Question 20

adhesion

Answer 20

force of attraction between molecules on two different

Question 21

cohesion

Answer 21

force of attraction within a material

Question 22

undercuts

Answer 22

mechanical bonding

Question 23

Phosporic acid

Answer 23

leaves rough surface for bonding

Question 24

wetting

Answer 24

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

Question 25

Smaller angle

Answer 25

greater wetting

Question 26

theta equal to 180

Answer 26

no wetting

Question 27

ideal adhesive

Answer 27

low surface tension and adheres with high energy

Question 28

High energy

Answer 28

balls up

Question 29

low energy

Answer 29

spreads flat

Question 30

long range order

Answer 30

crystak

Question 31

number of crystal structures

Answer 31

7

Question 32

no long range order

Answer 32

amorphous