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DMS > 2016 > Flashcards

2016 Flashcards

1
Q 
Which of the following monomers is used as a cross linking agent in dental polymers?
A) MMA
B) ethylene methacrylate 
C) ethylene glycol dimethecrylate
D) triethylene glyco dimethacrylate
A

C) ethylene glycol dimethecrylate

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2
Q 
Which increased glass transition temperature of polymer?
A) long branches
B) bulky side groups 
C) secondary bounding
D) plasticizers
A

C

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3
Q 
Which gypsum product do you use to pour a diagnostic of your patient?
A) type I
B) type II
C) type III
D) type IV
E) type V
A

C) type III

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4
Q

Step growth polymerization:
A) requires at least 2 dif chemical species of reactants
B) often results in low molecular weight products
C) requires reactants that are least difunctional
D) has very limited use in dental restorative materials
E) all of the above

A

E) all of the above

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5
Q 
Which of the following monomers is considered core of dental polymers?
A) urethane dimethacrylate
B) methyl methacrylate
C) ethyl methacrylate
D) vinyl acrylic
A

B) MMA

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6
Q 
What gypsum product would you use for mounting casting?
A) high for strength stone
B) dental stone
C) model plaster
D) impression plaster
A

D) impression plaster

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7
Q 
What is the reactor in alginate impression materials?
A) potassium alginate
B) sodium alginate
C) calcium sulfate dihydate
D) sodium alginate
A

C) calcium sulfate dihydate

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8
Q 
What is the key factor to consider regarding sol-gel transformation in agar impression materials?
A) water content
B) temperature
C) equipment 
D) none of the above
A

Water content

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9
Q 
When mixing an alginate impression, gelation develops as a result of formation of which of the following products:
A) calcium alginate
B) potassium alginate 
C) ammonium alginate
D) sodium alginate
A

A) calcium alginate

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10
Q 
What is a soluble form of alginate salts? 
A) Potassium alginate 
B) Sodiumphosphate

C) Calcium sulfate dihydrate 
D) All are soluble alginate salts
A

A) Potassium alginate

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11
Q 
Which of these materials is known to inhibit resin polymerization? 
A) Benzoylperoxide

B) Camphoroquinone

C) Eugenol 
D) Aromatic amine
A

C) Eugenol

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12
Q 
When calcium sulfate dihydrate mineral is heated under stream pressure, it will produce: 
A) Alpha hemihydrate 
B) Betahemihydrate 
C) Densite

D) Plaster of Paris
A

A) Alpha hemihydrate

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13
Q

All of the following are desired properties of an investment material except:
A) Sufficient strength at room temperature as well as high temperatures 

B) Stability at high temperatures
C) Sufficient shrinkage to compensate for expansion that takes place during 
casting 

D) Thermal expansion that plateaus at casting temperatures
E) Adequateporosity 


A

C) Sufficient shrinkage to compensate for expansion that takes place during 
casting 


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14
Q 
Which of the following natural elastomers is used to make Gutta-Percha? 
A) Cis1,4-polyisoprene

B) Trans 1,4-polyisoprene

C) Cis 1,4-polystyrene 
D) Trans 1,4-polystyrene
A

B) Trans 1,4-polyisoprene

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15
Q 
Which of the following impression materials are hydrocolloids? 
A) Alginate, polysiloxan

B) Alginate, agar

C) Impression plaster, polysiloxan 
D) Impression compound only
A

B) Alginate, agar


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16
Q

What is the reason for setting expansion of gypsum products? A) Highwater/powderratio

B) Chemicaladditives

C) Crystals impinge on one another
D) All of the above

A

C) Crystals impinge on one another

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17
Q 
Which is true regarding phosphate-bonded investments? 
A) Set by an acid-base reaction 

B) Are mixed with water only 

C) Are used for casting gold alloys 
D) None of the above is true
A

D) None of the above is true

18
Q

Which of the following gypsum products require the least amount of excess water? A) TypeI
B) TypeII
C) Type III
D) Type IV

A

D) Type IV

19
Q

Why is porosity required to be present in an investment?
A) Allow air/gas enter the mold during casting

B) Allow air/gas to escape during casting

C) Allow quick cooling of the investment mold
D) All mentioned above

A


B) Allow air/gas to escape during casting


20
Q 
What is the dispersion phase in reversible hydrocolloids? 
A) Water 
B) Agar 
C) Potassium alginate 
D) Calcium alginate
A

B) Agar

21
Q 
Which type of gypsum products has the greatest amount of compressive strength? 
A) Type I 
B) Type II 
C) Type III 
D) Type IV
A

D) Type IV

22
Q 
What type of investment is used to fabricate removable partial denture framework? 
A) Gypsumbondedinvestment

B) Phosphate bonded investment

C) Silicate bonded investment 
D) Densite based investment
A

B) Phosphate bonded investment


23
Q

Two samples of PMMA polymers may have the same chemical structure, but may differ greatly in their physical properties because of the molecular weight components.
A) True
B) False

A

A) True

24
Q

Permanent deformation of elastic impression materials is equal to elastic recovery. Permanent deformation is a function of percent compression, time under compression, and time after removal of the compressive load.
A) The first statement is true, but the second statement is false.
B) The first statement is false, but the second statement is true.
C) Both are false
D) Both are true

A

B) The first statement is false, but the second statement is true.

25
Q 
When calcium sulfate dihydrate mineral is dry heated, it will produce: 
A) Plasters 
B) Hydrocal

C) Densite

D) Plaster of Paris
A

A) Plasters

26
Q 
Which of the following impression materials set by a physical change? 
A) Impression compound 
B) Polysulfide

C) Alginate

D) Addition Silicones
A

A) Impression compound

27
Q 
What is the most important manipulative variable with gypsum products? 
A) Watertemperature

B) Water/powder ratio

C) Spatulation time 
D) Vacuum mixing
A

B) Water/powder ratio


28
Q 
Sulfur contained in latex gloves and powder can inhibit the polymerization of which of the following impression materials: 
A) Polysufides

B) Polyethers

C) Addition Silicones

D) Condensation silicones
A

C) Addition Silicones


29
Q 
Which of the following physical processes would lead to expansion of a hydrocolloid impression material? 
A) Evaporation 
B) Syneresis

C) Imbibition

D) Condensation
A

C) Imbibition


30
Q 
What is the initiator for chemically cured denture resins? 
A) Benzoyl peroxide 
B) Camphoroquinone 
C) Aromatic amines 
D) Eugenol
A

A) Benzoyl peroxide

31
Q

compared to phosphate-bonded investments, gypsum-bonded investments:
A) Set by an acid-base reaction

B) Are mixed with a special liquid

C) Are used for casting high-melting point alloys
D) Are used for casting gold alloys

A

idk

32
Q 
what is the accelerator for polysufide impression materials? 
A) Palladium 
B) Platinum 
C) Lead dioxide 
D) Barium
A

C) Lead dioxide

33
Q 
Which of the following materials sets by a reaction that yields a product that results in the largest dimensional change seen in an elastomeric impression material? 
A) Polysulfides 
B) Polyethers

C) Addition Silicones

D) Condensation Silicones
A

A) polysulfides

34
Q 
What will happen when the investment is heated in an oven before casting?
A) Casting ring will melt

B) Casting ring will shrink

C) Investment will shrink 
D) Investment will expand
A

D) Investment will expand

35
Q 
What is the physical state of a polymer when the room temperature is above its glass transition temperature? 
A) Rigid and stiff 
B) Strong and hard 
C) Soft and weak 
D) Rubbery
A

D) Rubbery

36
Q 
What do you expect to happen if you over-mix the alginate impression materials? 
A) Increasestrength

B) Destroy gel fibers

C) Increase setting time 
D) Increase working time 
E) It has no effect
A

B) Destroy gel fibers

37
Q 
What is the main constituent of inlay wax? 
A) Beewax 
B) Paraffin wax 
C) Spermaceti wax 
D) Candelilla wax
A

B) Paraffin wax

38
Q 
Which of the following is a thermoplastic polymer? 
A) Polysulfides

B) Polyethylene vinyl acetate

C) Polypropylene 
D) Poly methyl methacrylate
A

B) Polyethylene vinyl acetate


39
Q 
What is the result of increasing the water-powder ratio when mixing gypsum materials? 
A) Decrease strength of the material

B) Increasethesettingtime

C) Decrease the setting expansion 
D) Increase porosity of the set material
E) All of the above
A

E) All of the above

40
Q 
What is the proper amount of time before separating a gypsum cast from an alginate impression? 
A) 10minutes 
B) 20minutes 
C) 30 minutes 
D) 1 hour 
E) 24hours
A

D) 1 hour

DMS (3 decks)

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