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Dental Materials: Test 3 > Chapter 17 Review Questions > Flashcards

Chapter 17 Review Questions Flashcards

1
Q

A polymer is formed by
A. Breaking down chains of complex, high molecular weight molecules by heating them
B. Mixing polysulfide and polyether
C. Joining monomer molecules together in a long chain through carbon bonds
D. Fusing acrylic powder beads together at high temperatures

A

C.

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2
Q

Cross-linking of polymers
A. Is used to improve the physical and mechanical properties of the final resin product
B. Occurs when long-chain polymers are mixed together and the chains physically wrap around each other
C. Usually results in a weaker material as the degree of cross-linking increases
D. Occurs when long chains link end-to-end

A

A.

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3
Q

Addition polymerization
A. Results in porosity in the final material
B. Is the least common method of polymerization used in dentistry
C. Produces numerous by-products such as alcohol and acetone
D. Is initiated by a free radical

A

D.

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4
Q 
The physical stages of the addition polymerization reaction are 
A. Sandy, stringy, dough, and rubber
B. Wet, flexible, and stiff
C. Sol, gel, and solid
D. Initial, thermal, and terminal
A

D.

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5
Q

A heat-processed denture differs from a chemical-cured denture. Which of the following is NOT true for the heat-processed denture?
A. It is stronger
B. It is more porous
C. It is harder
D. It has less dimensional change during the first 24 hours after curing

A

B.

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6
Q

High-impact resins are created by
A. Removal of free monomers
B. Addition of plasticizers
C. Heat-treating the resin after it has polymerized
D. Addition of rubber particles to the acrylic

A

D.

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7
Q 
Which stage of polymerization of acrylic resins is longer for heat-cured resins during denture processing to allow adequate time to pack the acrylic resin into the denture flask?
A. Sandy
B. Stringy
C. Dough
D. Exothermic
A

C.

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8
Q 
What is the effect on a denture if it is left on the nightstand overnight?
A. It will lose water and shrink
B. It will expand
C. It will crack
D. It will oxidize and lose color
A

A.

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9
Q

What is the effect on a partial denture framework if soaked in a chlorine-containing cleaner?
A. Nothing will happen
B. The metal will clean rapidly and become shiny
C. The metal will dissolve and fracture
D. The metal will darken and corrode

A

D.

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10
Q

The effect that porosity has on an acrylic denture can be seen as all of the following except one. Which one?
A. It contribute to staining
B. It contributes to growth of microorganisms
C. It weakens the acrylic
D. It decreases the thermal conductivity of the acrylic

A

D.

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11
Q

The purpose of the use of a pressure pot during polymerization of a chemical-cured acrylic resin is
A. To increase the strength of the acrylic
B. To decrease porosity
C. To decrease shrinkage
D. All of the above

A

D.

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12
Q 
Which type of hard liner has the best physical properties?
A. Chairside chemical-cured liner
B. Laboratory chemical-cured liner
C. Laboratory heat-cured liner
D. None (they are all the same)
A

C.

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13
Q 
Methyl methacrylate is which one of the following?
A. An inhibitor
B. An accelerator
C. Powder polymer
D. Liquid monomer
A

D.

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14
Q

Long-term soft liners are indicated for all of the following reasons except one. Which one?
A. Chronic soreness with hard acrylic denture bases
B. Severe soft tissue undercuts
C. Sharp, knife-edge ridges
D. Soft tissues with chronic fungal infection

A

D.

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15
Q 
Acrylic resins can be made soft and pliable by the
A. Use of less monomer in the mix
B. Use of less powder in the mix
C. Addition of plasticizers
D. Addition of filler particels
A

C.

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16
Q

All of the following statements about short-term soft liners are true except one. Which one?
A. They are also called tissue conditioners
B. They can readapt to the tissues as healing takes place, because they have a high degree of flow
C.They do not need frequent replacement because they absorb water and get softer over time
D.They are adversely affected by some commercial denture soaks

A

C.

17
Q 
Over-the-counter denture liners have which of the following shortcomings?
A. May not reestablish proper occlusion
B. Are generally porous
C. Promote growth of yeasts
D. All of the above
A

D.

18
Q

All of the following are advantages of acrylic denture teeth over porcelain teeth except one. Which one?
A. They are more wear resistant
B. They chemically bond to the denture base
C. They are kind to the opposing teeth or ridges
D. They can easily be ground and shaped to fit the available space

A

A.

19
Q

When a denture is repaired with a chemical-cured acrylic resin, all of the following procedures are performed except one. Which one?
A. The pieces are reassembled and held with sticky wax
B. A layer of the old resin surrounding the fracture site is removed
C. The resin surrounding the fracture site is wet with monomer to enhance the chemical bond with the repair acrylic
D. The repair acrylic is mixed, applied to the fracture site, and allowed to cure at room temperature on the laboratory bench for the best results

A

D.

20
Q

Which one of the following statements regarding construction of custom impression trays is false?
A. Tray material may be chemically-cured or light-cured
B. Tray material is adapted directly to the cast
C. During polymerization, the chemical-cured material gets very hot
D. Baseplate wax is adapted over the cast to develop space for the impression material

A

B.

21
Q

Which one of the following statements is false regarding the care of dentures by the patient?
A. Dentures should be stored in water to prevent warping
B. Dentures should be cleaned over a sink filled with water or over a towel to prevent fracture if dropped
C. Abrasive pastes or cleaners should not be used, or they will scratch the acrylic
D. The denture should be cleaned in hot water periodically to kill microorganisms

A

D.

22
Q

Which one of the following statements about liquid monomer is false?
A. Gives a pleasant taste to a hard reline done at chair side
B. Is potentially harmful to breathe
C. Can cause allergic reactions or skin irritation
D. May be present in small quantities in a new denture
E. Evaporated readily so do not leave the cap to the bottle off

A

A.

23
Q

All of the following can have an adverse effect on soft denture liners except one. Which one?
A. Some effervescent commercial denture soaks
B. Liquid hand soap
C. Mouthwash containing alcohol
D. Hot water

A

B.

Dental Materials: Test 3 (4 decks)

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