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1

Elastic impression materials are...

Used in dentistry for construction of metal castings, ceramic restorations,bridges, implant restorations,partial denture frameworks and complete dentures

2

Elastic Impression materials are also used for what?

Both edentulous and dentistry patients having under cuts

3

Inelastic(rigid) materials are used...

Only with edentulous patients having NO or shallow under cuts

4

Elastic impression materials:

1.Agar colloid (reversible)
2.alginate colloid (Irreversible)
3. Polyvinyl silicoxane (reversible)
4. Polyether (reversible)

5

Inelastic (rigid) impression materials: (reversible)

1. Plaster of Paris
2. Impression compound
3. Zinc Oxide Paste
4. Impression waxes

6

Composition of alginate:

Agar (seaweed)

7

Composition of Polyvinyl:

??

8

What type of trays do poly vinyl use?

1. Stock
2. Disposable
3.Tri-Tray

9

Trays used for alginate:

1. Metal perforated trays
2. Disposable
3. Stock

10

Trays used for polyether:

Custom

11

Negative Impresssions

Impressions of the patients mouth

12

Positive impressions:

Poured impression in the stone known as the diagnostic cast

13

Sizes of Maxillary trays:

1-5 (5 is largest)

14

Sizes of Mandibular trays:

20-25 (20 is largest)

15

Parts of model trimmer:

1. Grinding wheel
2. Casing
3. Platform

16

Classifications of gold alloys:

-precious crowns
-non-precious crowns
-inlays
-onlays

17

Waxes used In lab:

Box

18

Borders of Diagnostic cast and how they are trimmed:

1. Anterior
Maxillary: 30 degrees ( D of canine to M of central)
Mandibular: rounded
2. Lateral
Maxillary: 65 deg.
Mandibular: 55 deg.
3. Posterior (90 deg.)
4. Posterior corners(115 deg.)

19

Stone of choice for pouring impressions:

Microstone- it’s less porous and gives greater detail

20

Classifications of gypsum material:

1. Impression plaster
2. Model plaster
3. Dental stone
4. Dental stone (High strength/Low expansion)
5. Dental stone (High strength/High expansion)

21

Diagnostic Cast:

Casts generally made from dental plaster or stone
Used for: Pt. Education, treatment, planning, and tracking the progress of treatment
(Also known as study models)

22

Direct restoration

When the material is put in immediately (in the office)
Ex: amalgam and composite

23

Indirect restoration

When the restoration is made outside of the office (the restoration is not placed immediately)

24

Metals used to fabricate partials:

Colbalt chronium alloy

25

Metals used to fabricate implants:

Titanium

26

Sealants

Unfilled/lightly filled resins

27

Composition of sealants:

1.bis-GMA
2. UDMA

28

Steps in application for sealants:

1. Isolate(cotton roll or rubber dam)
2. Pumice
3.Rinse/Dry
4.Etch (60 sec.) (chalky appearance)
5. Rinse 30 sec./ air dry
6. Place sealant (use explorer to move material down in grooves)
7. Light cure (20 sec.)
8. floss inter-proximally
9. Check occlusion

29

Brand name for polyether:

Impergum

30

Brand name for polyvinyl siloxane:

3M Express and Extrude

31

Bleaching trays(.040)

1. Take an impression of the max. And mand. Arch
2. Pour in microstone
3. Trim hole in the palate of casts so polyvinyl material form S over teeth
4. Apply light cured block out resin (cure 10 sec.) to facial surfaces of teeth to be bleached (or can be placed in the triad unit for a minute)
5. Place casts in middle of platform of vacuum former
6. Place .040 material in metal frame
7. Turn heater on
8. Material will begin to sad when warm (about an inch)
9. Turn off heater, lower metal frame over fast and turn vacuum on for material to confirm to the cast
10. Allow material to cool for a minute
11. Trim tray so it extends over teeth just to the gingival crest. It should have a scalloped appearance as it traces the outline of the gingival crest

32

Mouth protectors(.080)

1. Take an impression of Max. Arch
2. Pour into microstone
3. Trim hole in palate of casts so polyvinyl material form over teeth
4. Place cast in middle of platform of vacuum former
5. Place .080 material in metal frame
6. Turn heater on
7. Material will begin to sag when warm (about an inch)
8.Turn off heater lower metal frame over cast and turn vacuum on for material to conform to the cast
9. Allow material to cool for a minute
10. Trim tray 3/8 of an inch from facial and palate of cast

33

Poured syrup on paper plate

Viscosity

34

Dropped cotton role in water

Absorption

35

Silly putty

Inelasticity

36

Rubber band

Elasticity

37

Aluminum foil

Galvanic reaction

38

Marshmallows in paper clip

Compressive force

39

Ice in mouth

Thermal conductivity

40

Cutting up card

Shedding force

41

Type of anterior restorations:

1. Porcelain
2.Veneers
3. Porcelain fused to metal

42

Type of posterior restorations:

1. Inlay
2. Onlay
3. Gold crown

43

Inlay

Lays down inside of the tooth structure

44

Onlay

Lays on the tooth

45

Gold crown

Covers the tooth

46

Veneers

Like fingernails (snap on)

47

Composition of amalgam:

Silver, tin, copper, zinc

48

What comes in milagrams or spills?

Mercury

49

Restorative materials include what?

Materials used to repair or replace tooth structure lost to oral disease or trauma or to chance the appearance of teeth

50

Hue

The color of the tooth or restoration
(May include a mixture of colors such as yellow-brown)

51

Shade

An inappropriate shade selection will result in a mismatch to the patients dentition

52

Chroma

The intensity or strength of a color
(Bold yellow has more chroma than a pastel yellow)

53

Maryland bridge

.

54

Pontic

.

55

Veneers

Thin layer of ceramic or composite resin material that is bonded to the fronts of teeth to improve their appearance

56

Blacks classification of Cavities

.

57

Composite materials classifications of fillers(macro-fill, micro-fill, hybrid)

.

58

Karat vs. fineness

.

59

Amalgam (spills, mgs.,safe levels, act of mixing)

Spills-
1 spill-400 mg
2 spills-600 mg
3 spills-800 mg
Safe levels-
Act of mixing- mixed together in a triturator (or amalgamator)

60

Organs effected by mercury:

Kidneys

61

How can you be tested for mercury levels?

Urine or blood test

62

How composite materials come supplied:

1. Carpules with delivery system
2. Single syringe
3. 2 paste system

63

Should you invert your poured impression? (Base former)

.

64

PFG

.

65

Gold Crown

.

66

3/4 crown

.

67

Classifications of restorative materials:

A. Intermediate-(bases, liners, sedative bases) bases and liners are placed between the tooth and restoration
B. Temporary-(temporary cement for temp. Crowns, temp. Restorations) placed in the tooth for a short duration
C. Permanent- (amalgam, composite, porcelain crowns, gold crowns, and veneers)

67

Intermediate cements:

Varnish
Liner
Bases

67

Temporary cements:

Sedative base
Temporary restoration
Temporary cement

68

Permanent cements:

A. Resin-bonded (newest)
B. Glass Ionomers(release fluoride)
C. Zinc Polycarboxylate( got famous bc cement adhered to tooth structure and not crown)
D. Zinc phosphate (past tense very acidic)

69

Value

The amount of lightness or darkness of the tooth