Question 1

Dentures may be customized by:

Accepted Answer

A)   changing acrylic shades to match skin tone
B)   recreating diastemas
C)   placing restorations in the acrylic teeth
D)   All of the above are possible.E) All of the above
F) A) and D)

Question 2

When the acrylic powder and liquid are mixed, the chemical- and heat-cured materials go through a similar reaction, except that chemical-cured materials have a _________ in the liquid as an activator, whereas heat-cured materials do not.

Accepted Answer

A)   benzoyl peroxide
B)   hydroquinone
C)   glycol dimethacrylate
D)   tertiary amineE) C) and D)
F) B) and D)

Question 3

All of the following apply to porcelain denture teeth except:

Accepted Answer

A)   they are hard
B)   they are esthetic
C)   they are easily repaired
D)   they are stain resistantE) A) and B)
F) A) and C)

Question 4

A specialized aspect of a/an ________________ practice may include the fabrication of maxillofacial prostheses to replace facial tissues lost as the result of trauma, disease, surgery, or birth defect.

Accepted Answer

A)   prosthodontic
B)   periodontic
C)   endodontic
D)   orthodonticE) A) and B)
F) A) and C) A

Question 5

Match the items with the correct description below.
-Polymerization

Accepted Answer

A)  A long-chain, high molecular weight molecule produced by linking of many low molecular weight monomer molecules
B)  A polymer composed of numerous methyl methacrylate monomers linked together in a long chain
C)  The joining of adjacent long-chain polymers by bonding of short chains along their sides
D)  The act of forming polymers. The process can be activated by chemicals, heat, or light.
E)  Low molecular weight molecules that are joined to form polymersF) A) and B)
G) B) and C)

Question 6

Polymerization of chemical-cured acrylic resins is set into action when the tertiary amine in the liquid activates the __________ in the powder to produce free radicals.

Accepted Answer

A)   hydroquinone
B)   benzoyl peroxide
C)   glycol dimethacrylate
D)   plasticizersE) A) and D)
F) B) and C)

Question 7

Which of the following is true about polymers?

Accepted Answer

A)   They are large, long-chain molecules.
B)   They are small, long-chain molecules.
C)   They are large, short-chain molecules.
D)   They are small, short-chain molecules.E) None of the above
F) A) and D)

Question 8

The polymerized acrylic resin formed when a liquid monomer is mixed with a powder of small polymer beads is:

Accepted Answer

A)   bis-GMA
B)   benzoyl peroxide
C)   poly (ethyl methacrylate) 
D)   poly (methyl methacrylate) E) None of the above
F) A) and D)

Question 9

Which of the following is true of plastic (acrylic)  and porcelain denture teeth?

Accepted Answer

A)   Porcelain denture teeth chemically bond to the acrylic base of the denture.
B)   It is easier to grind porcelain denture teeth rather than acrylic denture teeth to adjust the occlusion or to reshape a tooth to fit the available space.
C)   Plastic denture teeth do not wear the opposing natural or artificial teeth or restorations.
D)   Porcelain teeth are used more often than plastic teeth.E) None of the above
F) B) and C)

Question 10

During processing of a denture base, heat-cured acrylic resin in the ________ stage is placed in the space created by removal of the wax and record base.

Accepted Answer

A)   sandy
B)   sticky
C)   dough
D)   rubberE) None of the above
F) B) and C)

Question 11

Which of the following is true regarding the properties of acrylic resins used in dentistry?

Accepted Answer

A)   Heat-cured acrylic resins shrink about 0.6% by volume.
B)   The coefficient of thermal expansion of acrylic resins is more than twice that of composite resins.
C)   The strength of acrylic resins is comparable with dental amalgam.
D)   Denture bases conduct temperature very well.E) B) and C)
F) B) and D)

Question 12

Loss of monomer or inadequate pressure during processing will result in:

Accepted Answer

A)   discoloration of the material
B)   a brittle material
C)   porosities in the material
D)   shrinkage of the materialE) A) and B)
F) A) and C)

Question 13

Match the items with the correct description below.
-Monomer

Accepted Answer

A)  A long-chain, high molecular weight molecule produced by linking of many low molecular weight monomer molecules
B)  A polymer composed of numerous methyl methacrylate monomers linked together in a long chain
C)  The joining of adjacent long-chain polymers by bonding of short chains along their sides
D)  The act of forming polymers. The process can be activated by chemicals, heat, or light.
E)  Low molecular weight molecules that are joined to form polymersF) A) and B)
G) A) and C) E

Question 14

Home care of dentures would include all of the following except:

Accepted Answer

A)   brushing with a denture brush after meals
B)   using a denture toothpaste to remove plaque
C)   soaking in mouthwash to remove odors
D)   soaking in white vinegar to remove calculusE) C) and D)
F) All of the above

Question 15

Which of the following correctly represents the stages seen when acrylic powder and liquid are mixed together?

Accepted Answer

A)   Stringy, sandy, dough, and rubber
B)   Dough, sandy, rubber, stringy
C)   Sandy, stringy, dough, and rubber
D)   Rubber, stringy, dough, and sandyE) C) and D)
F) A) and C)

Question 16

Describe the process of addition polymerization.

Accepted Answer

The free radical initiates the reaction ...

Question 17

Match the items with the correct description below.
-Poly (methyl methacrylate)

Accepted Answer

A)  A long-chain, high molecular weight molecule produced by linking of many low molecular weight monomer molecules
B)  A polymer composed of numerous methyl methacrylate monomers linked together in a long chain
C)  The joining of adjacent long-chain polymers by bonding of short chains along their sides
D)  The act of forming polymers. The process can be activated by chemicals, heat, or light.
E)  Low molecular weight molecules that are joined to form polymersF) B) and D)
G) A) and E)

Question 18

Record bases are used to:

Accepted Answer

A)   obtain secondary impressions for creation of secondary or master casts
B)   establish the proper dimension between upper and lower arches
C)   obtain final crown and bridge impressions
D)   fabricate porcelain veneersE) A) and C)
F) None of the above

Question 19

The most common form of polymerization in dentistry is:

Accepted Answer

A)   addition
B)   condensation
C)   tertiary
D)   propagationE) B) and D)
F) None of the above

Question 20

Match the items with the correct description below.
-Polymer

Accepted Answer

A)  A long-chain, high molecular weight molecule produced by linking of many low molecular weight monomer molecules
B)  A polymer composed of numerous methyl methacrylate monomers linked together in a long chain
C)  The joining of adjacent long-chain polymers by bonding of short chains along their sides
D)  The act of forming polymers. The process can be activated by chemicals, heat, or light.
E)  Low molecular weight molecules that are joined to form polymersF) C) and D)
G) D) and E) A

Exam 16: Polymers for Prosthetic Dentistry

Dentures may be customized by:

Correct AnswerverifiedShow Answer

When the acrylic powder and liquid are mixed, the chemical- and heat-cured materials go through a similar reaction, except that chemical-cured materials have a _________ in the liquid as an activator, whereas heat-cured materials do not.

Correct AnswerverifiedShow Answer

All of the following apply to porcelain denture teeth except:

Correct AnswerverifiedShow Answer

A specialized aspect of a/an ________________ practice may include the fabrication of maxillofacial prostheses to replace facial tissues lost as the result of trauma, disease, surgery, or birth defect.

Correct AnswerverifiedA

Match the items with the correct description below. -Polymerization

Correct AnswerverifiedShow Answer

Polymerization of chemical-cured acrylic resins is set into action when the tertiary amine in the liquid activates the __________ in the powder to produce free radicals.

Correct AnswerverifiedShow Answer

Which of the following is true about polymers?

Correct AnswerverifiedShow Answer

The polymerized acrylic resin formed when a liquid monomer is mixed with a powder of small polymer beads is:

Correct AnswerverifiedShow Answer

Which of the following is true of plastic (acrylic) and porcelain denture teeth?

Correct AnswerverifiedShow Answer

During processing of a denture base, heat-cured acrylic resin in the ________ stage is placed in the space created by removal of the wax and record base.

Correct AnswerverifiedShow Answer

Which of the following is true regarding the properties of acrylic resins used in dentistry?

Correct AnswerverifiedShow Answer

Loss of monomer or inadequate pressure during processing will result in:

Correct AnswerverifiedShow Answer

Match the items with the correct description below. -Monomer

Correct AnswerverifiedE

Home care of dentures would include all of the following except:

Correct AnswerverifiedShow Answer

Which of the following correctly represents the stages seen when acrylic powder and liquid are mixed together?

Correct AnswerverifiedShow Answer

Describe the process of addition polymerization.

Correct AnswerverifiedThe free radical initiates the reaction ...View AnswerShow Answer

Match the items with the correct description below. -Poly (methyl methacrylate)

Correct AnswerverifiedShow Answer

Record bases are used to:

Correct AnswerverifiedShow Answer

The most common form of polymerization in dentistry is:

Correct AnswerverifiedShow Answer

Match the items with the correct description below. -Polymer

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