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Dental Materials Final > Final Exam > Flashcards

Final Exam Flashcards

1
Q

Elastic impression materials are…

A

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

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2
Q

Elastic Impression materials are also used for what?

A

Both edentulous and dentistry patients having under cuts

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3
Q

Inelastic(rigid) materials are used…

A

Only with edentulous patients having NO or shallow under cuts

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4
Q

Elastic impression materials:

A
  1. Agar colloid (reversible)
  2. alginate colloid (Irreversible)
  3. Polyvinyl silicoxane (reversible)
  4. Polyether (reversible)
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5
Q

Inelastic (rigid) impression materials: (reversible)

A
  1. Plaster of Paris
  2. Impression compound
  3. Zinc Oxide Paste
  4. Impression waxes
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6
Q

Composition of alginate:

A

Agar (seaweed)

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7
Q

Composition of Polyvinyl:

A

??

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8
Q

What type of trays do poly vinyl use?

A
  1. Stock
  2. Disposable
  3. Tri-Tray
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9
Q

Trays used for alginate:

A
  1. Metal perforated trays
  2. Disposable
  3. Stock
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10
Q

Trays used for polyether:

A

Custom

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11
Q

Negative Impresssions

A

Impressions of the patients mouth

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12
Q

Positive impressions:

A

Poured impression in the stone known as the diagnostic cast

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13
Q

Sizes of Maxillary trays:

A

1-5 (5 is largest)

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14
Q

Sizes of Mandibular trays:

A

20-25 (20 is largest)

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15
Q

Parts of model trimmer:

A
  1. Grinding wheel
  2. Casing
  3. Platform
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16
Q

Classifications of gold alloys:

A
  • precious crowns
  • non-precious crowns
  • inlays
  • onlays
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17
Q

Waxes used In lab:

A

Box

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18
Q

Borders of Diagnostic cast and how they are trimmed:

A 
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.)
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19
Q

Stone of choice for pouring impressions:

A

Microstone- it’s less porous and gives greater detail

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20
Q

Classifications of gypsum material:

A
  1. Impression plaster
  2. Model plaster
  3. Dental stone
  4. Dental stone (High strength/Low expansion)
  5. Dental stone (High strength/High expansion)
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21
Q

Diagnostic Cast:

A

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)

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22
Q

Direct restoration

A

When the material is put in immediately (in the office)

Ex: amalgam and composite

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23
Q

Indirect restoration

A

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

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24
Q

Metals used to fabricate partials:

A

Colbalt chronium alloy

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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

Dental Materials Final (1 decks)

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