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Dental Materials > Dental Materials > Flashcards

Dental Materials Flashcards

1
Q

Jello is an example of a/n
A. Reversible hydrocolloid
B. irreversible hydrocolloid

A

Reversible hydrocolloid

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2
Q

Alginate is an example of a/n
A. Reversible hydrocolloid
B. irreversible hydrocolloid

A

Irreversible hydrocolloid

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3
Q

Hydrocolloid is an example of a/n A. Reversible hydrocolloid
B. irreversible hydrocolloid

A

Irreversible hydrocolloid

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4
Q

Instant pudding is an example of a/n
A. Reversible hydrocolloid
B. irreversible hydrocolloid

A

Irreversible hydrocolloid

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5
Q

The main potential hazard of mercury hygiene is in the form of mercury vapor
A. True. B. false

A

True

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6
Q

Decontamination of a room is possible after a Mercury spill only if the operatory is carpeted
A. True B. false

A

False

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7
Q

Cohesive gold is the only metal still used in its pure state in dentistry.
A. True. B. false

A

True

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8
Q

TMS pins need to be cemented into place.

A. True. B. false

A

False

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9
Q

Posts need to be cemented into place.

A. True. B. false

A

True

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10
Q

The best cement to use as a temporary filling on a sensitive tooth is: A.Polycarboxylate cement
B. zinc phosphate cement
C. calcium hydroxide
D. zinc oxide and eugenol

A

Zinc oxide and Eugenol

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11
Q 
The best cement to use as a base under a permanent filling on a tooth which is not sensitive is:
A. Polycarboxylate
B. zinc phosphate
C. Calcium hydroxide
D. Zinc oxide and Eugenol
A

Zinc phosphate

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12
Q 
The best material to use to cement orthodontic brackets to a tooth is:
A. Polycarboxylate
B. zinc Phosphate
C. Calcium hydroxide
D. Zinc oxide and Eugenol
A

Polycarboxylate

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13
Q

Zinc oxide and Eugenol can be used as a permanent filling if it is mixed thick.
A. True B. false

A

False

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14
Q 
Which of the following dental cements is the least irritating to the pulp?
A. Calcium hydroxide
B. ketac- cem
C. Flecks with Vaseline 
D. Zinc phosphate
A

Calcium hydroxide

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15
Q

It is a good idea to line a preparation with cavity varnish before a composite filling is placed on a sensitive tooth.
A. True B. false

A

False

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16
Q 
What speeds up the formation of secondary dentin? 
A. Calcium hydroxide
B. carboxylate
C. Zone
D. Zinc phosphate
A

Calcium hydroxide

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17
Q

Amalgam may be irritating to the pulp.
A. True
B. false

A

True

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18
Q

If there is a small exposure to pulp, the first thing to do would be:
A. Endodontic treatment
B. placement of ZOE
C. Placement of calcium hydroxate

A

Placement of calcium hydroxide

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19
Q

After placing ZOE in a tooth that has been sensitive, it is best to wait —- before placing a permanent restoration
A. 3days B. 4 wks
C. 2 wks. D. 3 wks

A

3 weeks

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20
Q 
If composite is handled with metal instruments, the material may:
A. Not be affected
B. turn gray
C. Turn brown
D. Become more brittle
A

Turn gray

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21
Q 
If polycarboxylate is mixed or handled with metal instruments, the material may:
A. Not be affected
B. turn gray
C. Turn brown
D. Become more brittle
A

Not be affected

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22
Q

Zinc Phosphate cement is soothing to the pulp.

A. True. B. false

A

False

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23
Q

This material is placed on the inner surface of the cavity prep to seal dentinal tubules on the exposed dentin and to prevent marginal leakage.
A. Dycal. B. temprex
C. Flecks D. Copalite

A

Copalite

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24
Q

If a patient had a temporary crown seated with temp bond and it came off within a day or two, and the tooth was not sensitive, it should be reseated with:
A. Flecks. B. flecks w/ Vaseline
C. Zone. D. Temrex

A

Flecks w/ vaseline

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25
Q

Derlon should be mixed on a glass slab
A. True
B. false

A

False

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26
Q

Para post should be cemented into place with ZOE
A. True
B. false

A

False

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27
Q

Dycal and Zone can be mixed interchangeably.
A. True
B. false

A

False

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28
Q 
Watercooled trays are used to carry which impression material? 
A. Elastomeric material
B. irreversible hydrocolloid 
C. Reversible hydrocolloid 
D. Impression plaster
A

Reversible hydrocolloid

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29
Q 
Syneresis is the
A. Uptake of water
B. loss of water 
C. Expansion of rubber base
D. Amount of elasticity in an impression
A

Loss of water

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30
Q 
Imbibition is the:
A. Uptake of water
B. loss of water
C. Expansion of rubber base 
D. Amount of elasticity in an impression
A

Uptake of water

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31
Q 
Under mixing irreversible hydrocolloid  impression material results :
A. Grainy mix w/ poor details
B. increased tear strength
C. Increased setting time
D. Finer surface detail
A

A grainy mix with poor detail

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32
Q

The effect of zinc oxide and Eugenol on the pulp is:
A. Irritating B. sedating
C. Has no effect
D. To control bleeding

A

Sedating

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33
Q

Why is zinc oxide and eugenol cement mix on a paper pad?
A. To prevent the material from setting too fast
B. To increase the setting time
C. To make cleaning easier
D. To decrease the setting time

A

To make cleaning easier

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34
Q

What is the consistency of zinc oxide and eugenol cement when it is used as a temporary restoration?
A. Fluid. B.firm and brittle
C. Putty-like. D.Smooth and creamy

A

Putty like

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35
Q 
Zinc phosphate cement may be used as a:
A. Permanent restoration
B. pulp-capping agent
C. Sedative restoration
D. Thermal insulator under
A

Thermal insulator under

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36
Q

Access zinc phosphate cement powder left on the mixing slab is:
A. Discarded
B. returned to the bottle
C. Placed under the cement base in the cavity preparation
D. Placed over cement base in the cavity preparation

A

Discarded

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37
Q

Excess ZOE cement powder left on the mixing slab is:
A. Discarded
B. returned to the bottle
C. Placed under the cement base in the cavity preparation
D. Placed over cement base in the cavity preparation

A

Returned to the bottle

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38
Q

Why is it a disadvantage if filling materials are radiolucent?
A. Cannot show the Buccal surface
B. can show how deep decay is
C. Will show clearly on radiograph
D. Difficult to differentiate between restoration and recurrent decay

A

Difficult to differentiate between restoration an recurrent decay

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39
Q

Which would be the restoration of choice for a small cavity on the mesial surface of the maxillary right Central?
A. Amalgam. B. gold inlay
C. Composite. D. Porc jacket

A

Composite

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40
Q

Which would be the restoration of choice, in most cases, to restore a distal occlusal cavity on the maxillary right first molar?
A. Amalgam. B.gold inlay
C.composite. D. Porc jacket

A

Amalgam

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41
Q

Which is the restoration of choice for a right maxillary lateral fractured half the way up the crown.
A. Amalgam. B.gold inlay
C. Composite. D.porc jacket

A

Porcelain jacket

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42
Q

Which is the restoration of choice for a mandibular second molar with the distal buccal cusp missing?
A. Amalgam
B. gold onlay
C. Composite
D. All of the above are of equal quality

A

Gold onlay

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43
Q

What is the most aesthetic material that can be used in fabricating an anterior bridge?
A. Acrylic B. gold
C. Chrome. D. Porcelain

A

Porcelain

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44
Q 
The chemical used to etch enamel is
A. Zinc oxide 
  B. methyl Methacrylate
C. Phosphoric acid
D. Eugenol
A

Phosphoric acid

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45
Q 
Preventative sealant resins are place on the:
A. Occlusal surface
B. proximal surface
C. Gingival third
D. Cusp tips
A

Occlusal surfaces

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46
Q 
The most frequent complaint of patients shortly after amalgam restorations are placed is:
A. Pain with percussion
B. An open contact point
C. Malocclusion
D. Numbness around the gingiva
A

Malocclusion

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47
Q 
The polysulfide based materials require mixing together the ----- and the ----- pastes.
A.accelerator, catalyst
B. catalyst, retardant
C.catalyst, base
D. Retardant , accelerator
A

Catalyst, base

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48
Q

If _____ is severe, the pulp is continually irritated, may cause the tooth to remain sensitive following placement of the restoration.
A. Acidity. B. galvanic action
C. Mastication. D. Microleakage

A

Microleakage

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49
Q 
Gutta perchance is used
A. As a dental wax 
B. as imp material for gold posts
C. As root canal filling material
D. Occl restoration of molars
A

As a root canal filling material

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50
Q 
One disadvantage of a porc jacket is that it
A. Is not color stable
B. is brittle
C. Has low tensile strength
D. Is irritating to Gingiva
A

Is brittle

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51
Q

The ability of material not to become permanently distorted under stress is called.
A.compression B.strain
C.Elasticity. D.Conductibility

A

Elasticity

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52
Q

“Flow” of a material refers to:
A. Continued change of a material under a given load
B. the consistency of a material when mixing
C. The homogeneity of gypsum material
D. Dimensional change of the material during setting

A

Continued change of the material under a given load

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53
Q 
The stress required to fracture a material by pulling it apart is known as: 
A. Compressive strength
B. ductile strength
C. Tensile strength 
D. Elastic strength
A

Tensile strength

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54
Q 
Which product undergoes an exothermic reaction when setting?
A. Amalgam 
B. zinc oxide-Eugenol 
C.composite
D.plaster
A

Plaster

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55
Q 
The impression material capable of change from gel to sol to gel is:
A. Irreversible hydrocolloid
B reversible hydrocolloid
C. Compound
D. Mercaptan
A

Reversible hydrocolloid

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56
Q 
Copper bands are used to carry which impression materials? 
A. Stick compound 
B. mercaptan
C. Zinc oxide paste
D. Irreversible hydrocolloid
A

Stick compounds

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57
Q

“Force” is:
A. Any push or pull upon matter
B. the distortion or change produced in a body as the result of its internal reaction to an external force
C. The internal reaction to an externally applied force
D. Any push upon matter

A

Any push or pull upon matter

58
Q

“Strain” is:
A. Any push upon matter
B. Any push or pull upon matter C.The distortion or change produced in a body has as the result of its internal reaction to an external force the result of stress
D. The Internal reaction to an externally applied force stress

A

The distortion or change produced in a body as the result of its internal reaction to an external force the results of stress

59
Q 
The characteristic of a liquid to flow easily over a surface is:
A. Flow
B. wetting
C. Viscosity
D. Strain
A

Wetting

60
Q

A “gel” is
A. A liquid
B. a colloid in which the dispersing medium is water
C. Suspension of particles in some type of dispersing medium
D. Semi solid colloid

A

Semisolid colloid

61
Q 
Sol is 
A. Liquid colloid
B. solid colloid
C. Semisolid colloid
D. Suspension of particles in some type of dispersing medium
A

Liquid colloid

62
Q 
\_\_\_\_\_ is contraindicated for use under resins and composites. 
A. Calcium hydroxide
B. cavity liners
C.cavity varnish
D.a and c
A

Cavity varnish

63
Q 
\_\_\_\_is the process by which mercury and alloy are mixed together . 
A. Amalgamation
B. polymerization 
C. Trituration
D. Blending
A

Trituration

64
Q

When extruding rubber base impression material, the
A. Base and accelerator are of equal volume
B. base and accelerator are of equal length
C. Amount of each material is not important
D. Base and accelerator are of equal weight

A

Base and accelerator are of equal length

65
Q

What is the disadvantage of using compound for making impressions of teeth for prepared crowns
A. It is not accurate
B. the result dies lack sufficient detail
C. Pulpal damage may result
D. The compound may not draw

A

The compound may not draw

66
Q 
A reason for boxing impressions is:
A: to decrease time necessary for trimming models
B. easy storage
C. Identification
D. To increase the hardness of the model
A

To decrease time necessary for trimming model

67
Q 
Improved stone is used:
A.to make dies
B. to make study models
C.for bite registration
D. For articulating models
A

To make dies

68
Q

Which cement has the highest compressive strength?
A. ZOE. B. ZOP
C. Polycarboxylate
D. Calcium hydroxide

A

ZOP

69
Q 
What is the advantage of using zinc polyacrylate ( poly-carboxylate) cement instead of zinc phosphate cement? 
A. Increased tensile strength
B. decreased irritation to pulp
C. Increased crushing strength
D. Increased compression strength
A

Decreased irritation to pulp

70
Q

Which material has the least amount of flow?
A. Acrylic. B. amalgam
C. Cast gold. D. Composite

A

Cast gold

71
Q

The process of chemically combining monomer and polymer is
A. Plating. B mesmerizing
C. Bonding. D. Polymerization

A

Polymerization

72
Q

Amalgam restorations.
1. Easily inserted. 2 relatively inexpensive.3 have low thermal conductivity 4 are most frequently used in dentistry.
A. 1,2,3. B. 2,3,4. C. 2,4,5 D. 1,2,4

A

D. 1,2,4

73
Q

What type of material can be used as a liner under acrylic or composite restorations?
A. Reflect. B. ZOE
C. Vitra-Bond. D. Varnish

A

Vitra -bond

74
Q

Tarnish and corrosion of amalgam can be reduced by:
A. Polishing the amalgam
B. using a zinc oxide Eugenol base
C. Using a squeeze cloth to remove excess mercury
D. Undertrituration

A

Polishing the amalgam

75
Q 
The primary reason for using an individual porcelain jacket is:
A. Amount of overjet
B. esthetics
C. Crushing strength
D. Edge strength
A

Esthetics

76
Q 
Dissimilar metal restorations in the same mouth can cause pain resulting from difference in:
A. Cavity preparation 
B. electrical potential
C. Thermal conductivity
D. Compressive strengths
A

Electrical potential

77
Q 
This difference in metal material is called.
A. Galvanic shock
B. electrical shock
C. Gold intolerance
D. Metal allergy
A

Galvanic shock

78
Q 
The oldest impression material is:
A. Impression plaster
B. irreversible hydrocolloid
C. Reversible hydrocolloid
D. Silicone impression material
A

Impression plaster

79
Q

Which material is thermoplastic?
A. Mercaptan B. alginate
C. Compound. D. Plaster

A

Compound

80
Q 
One disadvantage of using silicate restoration is: 
A. It has fluoride in it
B. shade is difficult to match
C. It is difficult to polish
D. It is water soluble
A

It is water soluble

81
Q 
Resin is changed from its plastic and easily molded shape into a hardened one by a process called
A. Polymerization
B. adhesion
C. Investment
D. Thermoplastic
A

Polymerization

82
Q

Agar impression materials are examples of ____ hydrocolloids.
A. Reversible. B. irreversible

A

Reversible

83
Q

Ductility is the ability of a material to withstand permanent deformation under_____ stress without fracture.
A. Compressive b. tensile
C. Shearing

A

Tensile

84
Q

Malleability is the ability of a material to withstand permanent deformation under ____ stress without rupture.
A. Compressive. B. tensile
C. Shearing

A

Compressive

85
Q

Durelon is as strong a cement as flecks.
A. True
B. false

A

False

86
Q 
Amalgamation takes place when \_\_\_\_ is added to an alloy.
A. Copper
B. mercury
C. Tin 
D. Zinc
A

Mercury

87
Q 
Polymerization takes place in sealants as a result of
A. Heat curing
B. light curing
C. Self curing
D. B and c
E. a and e
A

D . B and c

88
Q

The property of a liquid that causes it to flow easily is called:
A. Wetting. B. viscosity
C. Adhesion. D. None above

A

Viscosity

89
Q

The setting time of gypsum product may be lengthened or shortened by:
A:mixing speed. B. temperature
C. Water/power ratio
D. All above

A

All above

90
Q 
When mixing gypsum products, if the mix is too thick and more water is needed, the result would be:
A. Abnormal mix,decreased strength
B. abnormal mix, increased strength
C. An exceptionally good mix
D. Normal mix
A

Abnormal mix, decreased strength

91
Q

Substances are considered “thermoplastic” because of their ability to.
A. Solidify when cooled because of chem changes
B. be softened when heated because of chem changes
C. Be softened when heated and solidify when cooled with chem changes
D. Be softened when heated and solidify when cooled without chem change

A

Be softened when heated and solidify when cooled without chem changes

92
Q

A model or replica of a tooth after it has been prepared for an inlay or crown preparation is called a:
A. Pontic B. die
C. Connector D. None above

A

Die

93
Q 
Specifications and standards for dental materials are set by the:
A. Dentist.  
B. dental pharmacopoeia
C. American Dental Association
D. Council on dental therapeutics
A

American dental association

94
Q

Rubber base (mercaptan) impression material should be mixed in about:
A. One min. B. two mins
C. 30 sec. D. Three min

A

One minute

95
Q 
The best thing to use to clean ZOP off with is:
A. Bleach ( hypochlorite)
B. Brillo pad
C. Baking soda
D. Gluteraldehyde
A

Baking soda

96
Q

When mixing zinc phosphate cement, the use of a cool slab is essential because. Give best answer
A. Final mix will be cooler
B. More powder can be incorporated into the mix
C. It allows more control over the work
D. The slab will be easier to clean

A

More powder can be incorporated into the mix

97
Q

ZOP should be mixed in approximately one minute

A. True. B. false

A

False

98
Q

ZOE should be mixed in approximately one minute

A. True. B. false

A

True

99
Q 
For best result, the amalgam restoration should be polished: 
A. Immediately 
B. at least 12 hrs later 
C. 24 to 48 hrs later
D. At least 48 hrs later
A

24 to 48 hrs later

100
Q

Ultimate strength is the point at which stress is too great and the material fractures
A. True. B. false

A

True

101
Q

In pouring, stone should be added at one corner of an impression to prevent:
A. Air or water from being trapped on the surface of the cast
B. stone of poor quality from being present on the ridge area
C. Artifacts in the body of the cast

A

Air or water from being trapped on the surface of the cast

102
Q 
If zinc phosphate cement is mixed to rapidly, it will
A. Not affect its setting time
B. set faster/ decrease its setting time
C. Set slower/ increase its setting time
D. Not set
A

Set fasted/ decrease its setting time

103
Q 
Zinc phosphate cements should be mixed
A. Over a small area of the slab
B. over a large area of the slab
C. As slowly as possible
D. As quickly as possible
A

Over a large area of the slab

104
Q 
What material is used for "pulp-capping?"
A. Zinc phosphate
B. calcium hydroxide
C. ZOE
D. Durelon
A

Calcium hydroxide

105
Q 
During setting, plaster will 
A. Cool
B. expand
C. Contract
D. Become thermoplastic
A

Expand

106
Q

Polishing an acrylic resin denture should:
A. Be done at slow speed to prevent overheating
B. leave a high gloss on all surfaces
C. Be confines to peripheries only

A

Be done at a slow speed to prevent overheating

107
Q

What type of materials emit heat heat during a chemical reaction?
a. exothermic B. hygroscopic C. endothermic. D thermoplastics

A

Exothermic

108
Q

Why hold a bottle straight up and down when dispensing liquids
A. So it doesn’t drip
B. so it doesn’t change the size of drop
C. So there’s no change in molecular chemistry
D. So you can mi more cement

A

So it does not change the size of a drop

109
Q 
What does " amalgamate" mean
A. Squeeze out excess Mercury
B. mull material prior to condensation
C. Measure each substance on the scale
D. Unite a metal alloy with mercury
A

Unite a metal alloy with mercury

110
Q

The laboratory lathe is used primarily to:
A. Trim models. B. polish
C. Reduce wax bulk
D. Sharpen hand cutting instrument

A

Polish

111
Q

Any full or partial prosthes fabricated of acrylic should be kept submerged water to:
A. Keep it from picking up odors
B. Prevent distortion
C. Maintain color shades

A

Prevent distortion

112
Q

And acrylic appliance store in a sealed plastic bag prior to delivery from a laboratory in order to avoid
A. Discoloration. B. contamination
C. Distortion. D. All above

A

All above

113
Q

The ability of a material to withstand permanent deformation, under load without rupture is termed:
A. Tenacity. B. ductility
C. Elasticity. D. Malleability

A

Malleability

114
Q

In mixing plaster of Paris, which product is stronger, one with,
A. More water
B. less water

A

Less water

115
Q 
Increased water in gypsum mix will:
A. Prolong setting time 
B. increase the surface hardness
C. Accelerate the setting time reaction
D. Increase the compressive strength
A

Prolong setting time

116
Q 
When a cavity is close to the Pulpal area, the material used to promote formation of secondary dentin is: 
A. Zinc phosphate
B. copalite
C. Cavit
D. Calcium hydroxide
A

Calcium hydroxide

117
Q 
Zinc oxide and Eugenol cements are used for:
A. Endodontic cementation
B. permanent filling
C. A base for pulp sensitivity
D. Luting permanent restoration
A

A base for pulp sensitivity

118
Q 
What is the advantage for using glass ionomer cements? 
A. Long mixing time
B. Soothing to pulp 
C. Easy to manipulate
D. Cariostatic
A

Cariostatic

119
Q 
What is another advantage to using glass ionomer cements?
A. Temporary cementation
B. slow setting time
C. Easy to clean
D. Chemical bond to dentin and enamel
A

Chemical bond to dentin and enamel

120
Q 
The bases of trimmed models (study models) should be --- thick.
A. 1/8"
B. 1/4"
C. 1/2"
D. 1"
A

1/2”

121
Q 
Adding water to a mixture of ZOP will:
A. Contaminate the mix
B. speed up the final set
C. Slow down the final set
D. Not alter the final setting time
A

Speed up the final set

122
Q

What wax do you use to hold pieces of a broken denture together?
A. Utility. B. inlay
C. Compound. D. Sticky

A

Sticky

123
Q 
In what order will the asst mix and pass the rubber base material while assisting with an impression for a crown.
1. Load the syringe
2. Mix the heavy body material
3. Mix the light body material 
4. Load the custom tray 
A. 2,1,3,4.     B. 3,4,2,1
C. 3,4,1,2.     D. 3,1,2,4
A

D. 3,1,2,4

124
Q

What material will the dentist place first in amalgam preparation that requires minimal pulpal protection?
A. Amalgam. B. varnish
C. Zinc oxide Eugenol
D. Zinc phosphate

A

Varnish

125
Q 
The best methods for altering the setting  time of irreversible hydrocolloid is to...
A. Change the water/ powder ratio
B. Change the water temperature
C. Change the spatulation time
D. Add an accelerator
A

Change the water temperature

126
Q 
The sequence in which the following medications should be prepared for treatment in the cavity preparation is.…
1. Calcium hydroxide
2. Varnish
3. Zinc phosphate
A. 1,2,3.  B. 2,1,3. C. 3,1,2. D. 3,2,1
A

A. 1,2,3

127
Q 
While mixing zinc phosphate for cementation  of an onlay, the consistency has become too thick. Which of the following should the dental assistant do?
A. Add more liquid 
B. Leave out some of the powder
C. Prepare a new mix
D. Decrease spatulation
A

Prepare a new mix

128
Q 
Which of the following materials is used to stimulate secondary dental formulation?
A. Formocresol
B. cavity varnish
C. Zinc Phosphate 
D. Calcium hydroxide
A

Calcium hydroxide

129
Q 
All of the following may be mixed on the paper pad except: 
A. Calcium hydroxide
B. Polycarboxylate cement
C. Zinc Phosphate cement
D. Zinc  oxide eugenol cement
A

Zinc Phosphate cement

130
Q

If a reusable capsule with several scratches on the inside is used to triturate amalgam, the new mix may be affected in which of the following ways?
A. It will be unaffected if the scratches are few.
B. it will be contaminated by the previous mix
C. It will have excessive expansion because of the scratches
D. It will have in sufficient expansion because of the scratched

A

It will be contaminated by the previous mixes

131
Q

Which of the following types of waxes would be the best choice for use on the periphery of an Alginate impression tray?
A. Baseplate wax B. sticky wax
C. Utility wax. D. Impression wax

A

Utility wax

132
Q

Prior to constructing a custom acrylic tray. Wax may be placed over the study cast to…
A. Absorb heat
B. identify anatomical landmark
C. Provide a spacer for the final impression material
D. Conserve acrylic tray material

A

Provide spacer for the final impression material

133
Q

In the construction of a custom-made tray, the mixed resin mass should be —-.
A. Sticky. B. doughy
C. Hard. D. Fluid

A

Doughy

134
Q

Which of the following statements concerning dentures made out of acrylic type resin is true?
A. They may be cleaned with household scouring powder
B. they may be cleaned with soap and water
C. They should be kept dry if stored for long time
D. They should be stores in a container with hot water

A

They may be cleaned with soap and water

135
Q

The mixing time for most plasters and stones is approximately____.
A. 30sec B. 1 min
C. 3 min D. min

A

1 minute

136
Q 
Broken plastic appliances are temporarily repaired with
A. zinc phosphate cement
B.sticky wax
C.chrome cobalt
D. cold cure acrylic
A

COLD CURE ACRYLIC

137
Q

For which impression material is it most critial that a model be poured immediatly

  1. Irriversible hydrochloride material
  2. . Silicone impression
  3. .Reversible hydrocolloid material
  4. Rubber base impression
A

123

138
Q

The mixing time for most plasters and stones is approximately____.
A. 30sec B. 1 min
C. 3 min D. min

A

1 minute

139
Q 
Broken plastic appliances are temporarily repaired with
A. zinc phosphate cement
B.sticky wax
C.chrome cobalt
D. cold cure acrylic
A

COLD CURE ACRYLIC

140
Q

For which impression material is it most critial that a model be poured immediatly

  1. Irriversible hydrochloride material
  2. . Silicone impression
  3. .Reversible hydrocolloid material
  4. Rubber base impression
A

123

Dental Materials (1 decks)

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