Dental Materials Lecture 2 Review

Front 1

Ceramics:
Hardness:
Compressive Strength:
Tensile Strength:
Toughness:

Back 1

high
high
low
low

Front 2

Ceramic
MP:
Electrical conductivity:
Chemical Reactivity:
Solubility:

Back 2

Ceramic
MP: high
Electrical conductivity:low
Chemical Reactivity:low
Solubility:low

Front 3

Titanium
chemical reactvitiy
Corrosion Resistance

Back 3

chemical reactvity: high(not novel, basic)
Corrosion Resistance: High
stable TiO2

Front 4

Quartz/Glass

Composition, Structure, Phase change, formation

Back 4

Quartz, SiO2, crystalline, sharp, Tm= phase change, slow cooling
Glass, SiO2, amorphous, gradual, Tg = glass transition temp, rapid cooling

Front 5

Definitions and Terminology
rapid cooling of molten silica
recrystalliztion of glass

Back 5

vitrification

devirtrificaiton

Front 6

Number Average Molecular Weight:

MW: 10,000(10)
MW: 20,000(60)
MW: 30,000(30)

Degree of polymerization?

Back 6

xi x Mi= 1000,12000, 9000

Mn = 22,000

22,000/100= 220

Front 7

Thermoplastic polymers?
thermoset polymer?

Linear, branched, cross links, networks

Back 7

Thermoplastic: moldable(linear, branched)
Thermoset Polymer: steep stable crosslinks(network/crosslinks)

Front 8

Quartz,Glass:
comp.
structure
phase change
Formation

Back 8

Quartz: sio2, crystalline, Tm Melting point, gradual cooling

Glass:SiO2, amorphous, Tg glass transition temp, rapid cooling