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Dental Materials Final > Dental Materials Final > Flashcards

Dental Materials Final Flashcards

1
Q

When a 2 paste system of ZOE is used how are the materials mixed?

A

Until a uniform color is achieved

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2
Q

Classifications of class 2 gold alloy?

A

Medium
Inlays and crowns

Medium yield strength

Medium wear resistance

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3
Q

What is a negative impression?

A

Impression of the patients mouth with alginate

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4
Q

Mixture of small and microfine particles

A

Micro hybrid

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5
Q

Composition of sealant materials

A

bis-GMA glycidyl methalacrylate UDMA urethane dimethacrylate

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6
Q

Microhybrid with nanosized particles added

A

Nanohybrid

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7
Q

How do we test for mercury levels?

A

Urine sample

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8
Q

What is 1 spill of mercury?

A

400 mg

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9
Q

How are the anterior borders of a diagnostic cast trimmed?

A

Symmetrical to the midline maxillary- runs distal of canine to midline mandibular- distal of canine to distal of canine

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10
Q

The act of mixing amalgam

A

Trituration

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11
Q

This is the color of a tooth or restoration. It may include a mixture of colors like yellow-brown

A

Hue

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12
Q

What does class 1 gold alloy consist of?

A

Soft
Inlays (not heavy in function)
Low yield strength
Low wear resistance

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13
Q

What materials are used for impressions?

A

Polysulfide
Polyvinyl
Alginate

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14
Q

Amount of lightness or darkness in the tooth

A

Value

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15
Q

What organs are affected by mercury?

A

Main organ is kidneys!

Brain kidneys and testicles retain mercury the longest

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16
Q

What is an alginate impression tray?

A

Metal perforated trays
Disposable
Stock

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17
Q

What makes ZOE biocompatible with tooth structures?

A

The neutral PH of 7

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18
Q

What stone is the choice of pouring impression materials?

A

Micro stone, less porous and gives better detail

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19
Q

What is a metallic impression material composed of silver based alloy with mercury?

A

Amalgam

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20
Q

What are the two ways elastic impression material can be classified by?

A

Irreversible and reversible

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21
Q

Fillers that are smaller averaging 0.04 in diameter 0.03 to 0.05

A

Microfilled

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22
Q

What was G.V. Black’s classification of cavities?

A

He and Frederick McKay determined drinking water was the factor of cavities

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23
Q

What is the anatomical portion of the cast?

A

Oral anatomy

2/3 of total height

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24
Q

What type of elastic material will not return back to its original state?

A

Irreversible (powder/liquid)

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25
Q

Class 2 of gypsum products

A

Model plaster (almost obsolete)

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26
Q

Indirect restorations

A

Fabricated outside of the mouth

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27
Q

These materials are expected to be long lasting replacement for missing damaged or discolored teeth

A

Permanent restorations

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28
Q

Steps for applying a sealant

A 
Isolate the tooth 
Pumice with non fluoridated paste
Rinse and dry
Apply etchant for 60 sec 
Rinse and dry
Apply sealant 
Light cure for 30-60 seconds 
Floss
Check occlusion
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29
Q

What does TLV mean?

A

Threshold limit value

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30
Q

What are the sizes of mandibular impression trays?

A

20-25

20 is largest

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31
Q

What are veneers?

A

Thin layers of esthetic materials that are used to improve the appearance of the teeth. They are bonded to the fronts of the teeth. Can be used to lighten the color of teeth, cover stains, repair chips, lengthen worn down teeth, increase the size of small teeth, close spaces, or reshape crooked teeth

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32
Q

PFG

A

Porcelain fused gold

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33
Q

What are the classifications of impression materials?

A

Elastic and rigid

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34
Q

What are ZOE cements?

A

Zinc oxide eugenol cements

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35
Q

What is boxing wax?

A

Wraps around impression to make a base

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36
Q

What is a polyvinyl impression tray?

A

Stock disposable tri-tray

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37
Q

What is a polysulfide impression tray?

A

Custom tray

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38
Q

What are classification of compositions by filler size?

A

Macrofilled, microfilled, hybrid, microhybrid, nanohybrid, nanocomposites

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39
Q

Classifications of class 3 gold alloy

A

Hard
Inlays crowns bridges
High yield strength
High wear resistance

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40
Q

Positive replicas of teeth produced from impressions that create a negative representation of teeth.. commonly called study models and generally made from plaster or stone. Used for patient ed., treatment planning, and tracking progress

A

Diagnostic casts

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41
Q

What gauge material is used for fabricating mouth protectors?

A

0.080

42
Q

Contains both large and small fillers

A

Hybrid

43
Q

Aka provisional restorations used for short periods of time, several days to weeks

A

Temporary restorations

44
Q

Class 4 gypsum products

A

Dye stone (made to pour dyes, used for ceramics/crowns)

45
Q

What are ZOE cements used for?

A

Temporary cementation, temp or intermediate restorations, high and low strength bases, root canal sealers and perio dressings

46
Q

Like provisional, placed for limited time however the time may extend from weeks to months

A

Intermediate

47
Q

Resin bonded cement

A

Max-cem elite: this cement etches bonds and adheres to the tooth structure all in one. Has nano particles, contains quartz, lithium, and very compatible to tooth and crown bridge or veneer. No mixing!

48
Q

Zinc polycarboxylate

A

Supplied powder liquid used for final cementation of indirect restorations. Long term, temp cements

49
Q

What type of impression material is able to pick up undercuts?

A

Elastic

50
Q

What material is reversible?

A

Rigid (thermoplastic)

51
Q

What are ZOE cements suited for and why?

A

Temp restorations - their weaker tensile strength allows them to be easily removed at a second apt. when a temp restoration is to be placed

52
Q

What are sealants?

A

Unfilled or lightly filled resin used to seal noncarious pits/fissures of deciduous and permanent teeth

53
Q

The measure of gold content

A

Karat

54
Q

The intensity of strength or color

A

Chroma

55
Q

How do composite materials come supplied?

A

Delivery system
Single syringe
Two paste system

56
Q

Holy fuck

A

This is taking forever

57
Q

Which type of impression material will not pick up undercuts?

A

Rigid

58
Q

Physical and chemical properties of gypsum

A

Dihydrate
(Cas04*2H2O)
Happens when water is mixed with powder

Hemihydrate
(Cas04*1/2H20)
Process called calciling to dry off powder

59
Q

What gauge material is used to fabricate bleaching trays?

A

0.040

60
Q

What are the sizes of max impression trays?

A

1-5

1 is largest

61
Q

How are the lateral borders of a cast trimmed?

A

Parallel to buccal surface of posterior teeth

Distal of canine to distal of molar

62
Q

What are the steps in fabricating mouth protectors?

A 
Trim cast in horseshoe shape
Insert material in frame 
Place max cast on platform 
Lower when heated and sagged 
Turn on vacuum 
Remove guard when cooled 
Trim excess material
63
Q

Large particles ranging from 10-100 microns. Make composites difficult to polish and can become rough

A

Macrofilled

64
Q

Filler particles ranging from 5-75 nanometers

A

Nanocomposites

65
Q

Class 1 gypsum products

A

Impression plaster, almost obsolete

66
Q

Classification of restorative materials

A

Temporary
Intermediate
Permanent

67
Q

GC

A

Gold crown

68
Q

What is the safe level for mercury in a 40 hr work week?

A

.005/m3

69
Q

How are ZOE cements available?

A

Powder/liquid

And 2 paste systems

70
Q

What is a positive impression?

A

When the impression is set in stone… diagnostic cast

71
Q

How are the posterior borders of a cast trimmed?

A

Square with the midline, trim these with max and mand casts together

72
Q

When the powder/liquid system of ZOE is used, how is it mixed?

A

Powder into liquid until heavy consistency is achieved

73
Q

What is 2 spills of mercury?

A

600 mg

74
Q

What is the art portion of the diagnostic cast?

A

Base of the study model 1/3 of total height

75
Q

Glass ionomers

A

Capsule form now. Mixed in a Vari-mix. Should you have to mix any of these in powder/liquid ratio is now on the top of bottles

76
Q

What type of elastic material will return to its original state?

A

Reversible(only 1 type of impression material is reversible)

77
Q

Class 3 gypsum products

A

Dental stone (we use micro stone)

78
Q

What are the types of permanent cements?

A

Resin bonded
Glass ionomers
Zinc
Polycarboxylate

79
Q

What has eugenol been known for?

A

It’s sedative effect to the pulp largely caused by its antibacterial effects

80
Q

Used of gypsum

A

Diagnostic cast, working cast, dye

81
Q

Steps in fabricating a bleaching tray

A 
Trim cast
Apply blockout to teeth
Light cure blockout resin 
Put thermoplastic sheet in vacuum former
Place cast in center of platform
Once it is heated and sags, lower frame and turn on vacuum 
Cool and remove cast
Trim with scissors
82
Q

How does mercury supplied?

A

In premeasured capsules known as mg spills

83
Q

Composition of polysulfide impression materials

A

Sulfa 1:1 ratio used for dentures or crown and bridge

84
Q

Classification of class 4 gold alloy

A

Extra hard
Partial denture framework bridges
High yield strength
High wear resistance

85
Q

What metals are used to fabricate implants?

A

Titanium

86
Q

What metals are used to fabricate partials?

A

Cobalt chromium alloy

87
Q

What does a diagnostic study model contain?

A

Max and mand cast 3/3

88
Q

What is 3 spills of mercury?

A

800 mg

89
Q

What is the composition of polyvinyl impression material?

A

Polyvinyl siloxane used for crown and bridge

1:1

90
Q

Direct restorations

A

Placed directly onto cavity preparations

91
Q

Composition of ZOE

A

Power- zinc

Liquid- eugenol

92
Q

What are the parts of the model trimmer?

A

Grinding wheel
Casing
Platform

93
Q

What is the percentage of gold times 10

A

Fineness

94
Q

Classification of cavities; Class I

A

Cavities located in pits or fissures. These are located in the occlusal surfaces of molars and premolars, the occlusal two-thirds of the buccal surfaces of molars, the lingual surfaces of upper incisors, and occasionally in the lingual surfaces of upper molars.

95
Q

Classification of cavities; Class II

A

Cavities located in the proximal surfaces of molars and premolars.

96
Q

Classification of cavities; Class III

A

Cavities in the proximal surfaces of canines, and incisors not involving the incisal angles.

97
Q

Classification of cavities; Class IV

A

Cavities in the proximal surfaces of incisors or canines which also involve one or both of the incisal angles.

98
Q

Classification of cavities; Class V

A

Cavities located in the gingival third of the labial, buccal, lingual, or palatal surfaces of any tooth.

99
Q

Pontic

A

artifical tooth usually attached to a partial or bridge. Made of porcelain or ceramic

100
Q

Maryland bridge

A

Commonly used to replace front teeth. A pontic is attached to metal bands that are hidden with white colored composide resin and attached to the backsides of the teeth on either side of the pontic

Dental Materials Final (1 decks)

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