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Flashcards in Materials Midterm Deck (61):
1

Alloy

Combination of two or more metals

2

What material has been used for over 150 yrs

Amalgam

3

What type of restoration is glass ionomer used for

Primary teeth, final restorations in non stressed areas, sealants, core material for build ups, provisional restorations

4

IRM

Intermediate restorative material: short term restoration like zinc oxide Eugenol composition

5

Material that is still pliable when applied to teeth is what kind of restoration

Direct

6

Indirect restoration

A restoration fabricated outside the mouth by a lab tech

7

Where are indirect restorations made

In a lab

8

Liquids with high viscosity are not effective in what

Wetting a surface

9

Tensile stress

Pulls and stretches (tug of war)

10

Compressive stress

Pushes material together (chewing)

11

Shear stress

Sliding

12

How many mg are in a single capsule of amalgam

600 for small 800 for large

13

What type of restorations use amalgam

1,2,5 for direct

14

What is done with an amalgam capsule after mixing is complete

Placed in wide mouth airtight container labeled

15

Amalgamation

Mercury and alloy are mixed

16

How is curing time influenced for a composite restoration

Thickness and size of restoration, shade of material, manufacturers instructions

17

Advantage of using glass ionomer

Fluoride release, adhesion, resistance to acid erosion, strong, biocompatible with oral enviro, inhibits decay

18

Macrofilled composites

Conventional/traditional composite that contains large amounts of filler particles and provides strength

19

How many pounds per square inch does a posterior restoration need to withstand

170 pounds 28,000?

20

What metals make up alloy

Silver, zinc, tin, copper

21

What does silver do

Strength

22

What does tin do

Workability and strength

23

What does copper do

Strength and corrosion resistance

24

What does zinc do

Suppress oxidation

25

What is corrosion

Reaction that occurs within metal when exposed to temp, humidity, and saline

26

How is corrosion removed

Polishing agents

27

What is a non Mercury alloy

Galloy: composed of gallium, indium, and tin (gallium)

28

What is used to ensure accurate ratios of alloy and Mercury

Eames technique 1:1

29

What does properly triturated amalgam look like

Soft, pliable, and easily shaped

30

What type of cement used as adhesive for permanent indirect restorations

Type 1: luting agent (glass ionomer, ZOE, poly carboxylate, zinc phosphate)

31

How should cements be dispensed when there is powder to liquid involved

Powder and liquid on opposite sides, In increments, smallest first

32

When would u use temp cement

When u need temp coverage until perm restoration is ready or patient is in pain and something is needed

33

What might happen if there is a delay in mixing and placing of indirect restoration

Result in initial setting process causing casting to not seat right

34

What cement gives of exothermic heat

Zinc phosphate

35

How is cement placed in an indirect restoration for delivery

Line surface

36

What kind of cement is less sensitive to the pulp than zinc phosphate

Polycarboxlyate

37

Which type of glass ionomer is used to restore areas or erosion near gingiva

Type 2

38

Which type of cement would be used for cement action of ceramic veneers

Composite resin

39

What can occur if cement is left around margins of the crown

Cement can irritate the area and cause inflammation and discomfort

40

What can influence cementation procedure

Mixing time, humidity, powder to liquid ratio, temp

41

What should a provisional restoration be filled with when being placed for temp coverage

Luting cement

42

How does polycarboxlyate appear once setting has initiated

Loss of glossiness is stringy or weblike

43

If more time is needed for mixing of a cement what can be used

A glass slab

44

What cement is irritating to the pulp and most acidic

Zinc phosphate

45

What is an impression

Negative reproduction of the mouth

46

What material used first with elastomeric impression

Light bodied

47

3 classifications of impressions

Preliminary, final, occlusal (bite registration)

48

What is made from preliminary impression

diagnostic models, custom trays, provisional coverage, orthodontic appliances, pretreatment/post treatment records

49

How much material should fit between tray and edges of teeth

2-3mm

50

What does an impression become after poured in plaster

A positive

51

What irreversible hydrocolloid is used most widely for preliminary impressions

Alginate

52

How quickly should alignate impression be poured up

Within 1 hour of taking impression

53

Imbibition

Absorption of water causing object to swell

54

Syneresis

Loss of water causing to shrink

55

How do u alter setting time of irreversible alignate

Using cool water

56

What is the elastomeric material with highest viscosity

Putty

57

What can an automix system for elastomeric impression material do

Automatically mixes and dispenses used with light and heavy body

58

3 curing stages for impression materials

Initial set, final set, final cure

59

How does water affect alignate impression mix

Alter setting time

60

What is the most viscous reversible hydrocolloid

Tray material/heavy bodied

61

3 classifications for impression materials

Irreversible and reversible hydrocolloid and elastomeric