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Flashcards in Introduction Deck (79)
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1

What are the material categories?

Composite, ceramic, metal, and polymer

2

What kind of material are composite resin and glass-ionomer?

Polymer-ceramic

3

Are there metal-polymers in dentistry?

No

4

How are dental materials characterized?

By the structure, properties, applicability, requirements, aesthetics, handling properties, and patient satisfaction

5

What are examples of suboptimal materials used early in history?

Copper, tin, bronze, and gold

6

What are materials used to construct artificial organs, rehabilitation devices, or prostheses and replace natural body tissue?

Biomaterials

7

Can bio materials cause harm or a negative reaction?

No

8

What are examples of synthetic biomaterials

Composites and silicone impression material

9

What are examples of natural biomaterials

Alginate and hydrocolloids

10

What are examples of tissue-engineered biomaterials

Stem cells, replacement tissues (grow tooth from bud)

11

Properties of metal

Hard, ductile (bend w/o breaking), strong

12

Properties of ceramics

Hard, brittle, strong

13

Properties of polymers

Soft, ductile, weak

14

Which materials have high processing temperatures?

Metals and ceramics

15

Which material has a lower processing temperature?

Polymers

16

Which material tend to be used as direct process materials?

Polymers

17

How are metals used in dentistry?

Cast metal crowns, implants, metal-ceramic crowns, endo treated teeth

18

How many electrons do metallic elements have in their outer shell?

1-3

19

Are electrons tightly or loosely bound to the nucleus in a metal bond?

loose

20

What does is mean that electrons have free mobility in metallic bonds?

thermal and electrical conductivity, ductility-bend without breaking

21

What is the microstructure of metals?

polycrystalline structures - single phase-single composition
formation of grains upon cooling

22

How many metals are mixed in metal alloys?

Two or more

23

Where are metal alloys used in dentistry?

cast crowns and amalgam fillings

24

Are metal alloys more or less ductile?

Less ductile and stronger (resists forces)

25

Why are noble metals used?

To resist reformation and impede dislocations
AKA makes defects less prone to failure

26

What are examples are solid solution hardening metals?

Gold, silver, palladium, and platinum

27

True or False
The larger the grain size of the metal, the better the mechanical properties?

False
The smaller the grain size the better the mechanical properties

28

What is the microstructure of ceramic?

crystalline (long range order) or noncrystalline (short rang or no long range)

29

What is the microstructure of most dental ceramics?

semicrystalline or polycrystalline

30

What is the microstructure of dental porcelain?

glass w/ some crystalline residuals )noncrystalline or amorphous silcate glass)