Question 1

Which of the following is true regarding addition polymerization?

Accepted Answer

A)   It occurs in three stages: initiation, margination, and condensation.
B)   Monomers have a core of two silicon atoms joined by a double bond.
C)   One carbon atom has two hydrogen atoms attached, and the other carbon atom has attached to it one hydrogen atom and one reactive group called a free radical.
D)   The reaction produces by-products such as water, hydrogen gas, or alcohol that may compromise the physical properties or handling characteristics.E) A) and B)
F) B) and D)

Question 2

Describe how a denture is fabricated using heat-cured resin.

Accepted Answer

The technician places the cast of the ed...

Question 3

Polymerization shrinkage is seen most readily in which of the following areas of a heat-cured acrylic resin denture?

Accepted Answer

A)   Labial flange
B)   Alveolar ridge
C)   Palatal
D)   Hamular notchE) B) and D)
F) B) and C)

Question 4

Denture teeth are usually made of:

Accepted Answer

A)   plastic
B)   acrylic
C)   porcelain
D)   Any of the aboveE) A) and B)
F) None of the above

Question 5

All of the following are true about cross-linked polymers except:

Accepted Answer

A)   they have short chain atoms attached
B)   the bond is stronger and stiffer
C)   the bonds are weak
D)   the material is not easily manipulatedE) B) and D)
F) None of the above

Question 6

Which of the following is true of long-term soft liners for complete and partial dentures?

Accepted Answer

A)   Long-term liners may not be processed with the application of heat.
B)   Silicone long-term liners are less stable over the long term than acrylic long-term liners because they have softeners that leach out.
C)   Silicone liners are easy to adjust.
D)   Long-term soft liners often do not form a good bond to old acrylic.E) A) and D)
F) None of the above

Question 7

Which of the following laboratory devices helps keep the monomer from evaporating during polymerization and creates a denser acrylic?

Accepted Answer

A)   Bunsen burner
B)   Pressure pot
C)   Lathe
D)   Vacuum-forming machineE) None of the above
F) A) and B)

Question 8

Which of the following is true of in-office care of a complete denture?

Accepted Answer

A)   Patients will not form calculus on a denture.
B)   Calculus can be removed by placing the prosthesis in a denture cleaning solution inside a zippered bag placed in an ultrasonic cleaner.
C)   It is helpful for the patient if teeth and the acrylic base are worn down during the polishing process.
D)   Tissue-bearing surfaces of the complete denture should be polished during cleaning.E) C) and D)
F) A) and B)

Question 9

Dentures must be relined periodically because:

Accepted Answer

A)   dentures absorb odors from plaque and food
B)   alveolar ridges shrink over time
C)   dimensional changes in acrylic occurD) A) and B)
E) A) and C)

Question 10

Which of the following is true of the chairside reline?

Accepted Answer

A)   It utilizes an indirect technique in which an impression of the tissues is made inside the existing denture and a cast is made from this impression.
B)   The reline material is applied to the primed denture base and the denture is reseated in the patient's mouth for border molding.
C)   An indexing instrument is used to establish the relationship between the cast and the denture.
D)   The lining material is heat- and pressure-processed in the denture base.E) C) and D)
F) All of the above

Question 11

In an addition polymerization reaction, the free radical initiates the reaction by:

Accepted Answer

A)   opening the bond between the two carbon atoms of the monomer
B)   creating a bend in the carbon atom
C)   excluding divalent cations
D)   reversing the polarity of the monomer chainE) None of the above
F) B) and C)

Question 12

The monomer will _____________ if the temperature becomes too great during the polymerization process.

Accepted Answer

A)   cause crazing of the material
B)   vaporize and produce porosity
C)   bleach the denture white
D)   warp the prosthesisE) A) and B)
F) B) and D)

Question 13

Sources of dimensional change for polymeric materials include:

Accepted Answer

A)   accelerators and inhibitors
B)   coefficient of thermal expansion
C)   thermal conductivity
D)   water sorptionE) A) and B)
F) B) and C)

Question 14

Match the items with the correct description below.
-Cross-linked polymers

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) C) and E)

Question 15

Why do some clinicians place three or four 2-mm-diameter holes in the wax spacer in the anterior and posterior ridge regions?

Accepted Answer

A)   The spacer creates a uniform thickness for impression material.
B)   The holes help prevent the wax from separating from the stone model.
C)   Placing holes creates a mesh for bonding of acrylic to a metal framework.
D)   It helps orient the tissue-bearing side of the tray toward the teeth.E) A) and B)
F) A) and C)

Exam 16: Polymers for Prosthetic Dentistry

Which of the following is true of in-office care of a complete denture?

Correct Answer
verified

Sources of dimensional change for polymeric materials include:

Correct Answer
verified

Which of the following is true of long-term soft liners for complete and partial dentures?

Correct Answer
verified

Match the items with the correct description below. -Cross-linked polymers

Correct Answer
verified

Denture teeth are usually made of:

Correct Answer
verified

Which of the following is true of the chairside reline?

Correct Answer
verified

Why do some clinicians place three or four 2-mm-diameter holes in the wax spacer in the anterior and posterior ridge regions?

Correct Answer
verified

Which of the following laboratory devices helps keep the monomer from evaporating during polymerization and creates a denser acrylic?

Correct Answer
verified

Polymerization shrinkage is seen most readily in which of the following areas of a heat-cured acrylic resin denture?

Correct Answer
verified

In an addition polymerization reaction, the free radical initiates the reaction by:

Correct Answer
verified

All of the following are true about cross-linked polymers except:

Correct Answer
verified

Which of the following is true regarding addition polymerization?

Correct Answer
verified

Dentures must be relined periodically because:

Correct Answer
verified

The monomer will _____________ if the temperature becomes too great during the polymerization process.

Correct Answer
verified

Describe how a denture is fabricated using heat-cured resin.

Correct Answer
verified
The technician places the cast of the ed...
View Answer

Exam 16: Polymers for Prosthetic Dentistry

Which of the following is true of in-office care of a complete denture?

Correct AnswerverifiedShow Answer

Sources of dimensional change for polymeric materials include:

Correct AnswerverifiedShow Answer

Which of the following is true of long-term soft liners for complete and partial dentures?

Correct AnswerverifiedShow Answer

Match the items with the correct description below. -Cross-linked polymers

Correct AnswerverifiedShow Answer

Denture teeth are usually made of:

Correct AnswerverifiedShow Answer

Which of the following is true of the chairside reline?

Correct AnswerverifiedShow Answer

Why do some clinicians place three or four 2-mm-diameter holes in the wax spacer in the anterior and posterior ridge regions?

Correct AnswerverifiedShow Answer

Which of the following laboratory devices helps keep the monomer from evaporating during polymerization and creates a denser acrylic?

Correct AnswerverifiedShow Answer

Polymerization shrinkage is seen most readily in which of the following areas of a heat-cured acrylic resin denture?

Correct AnswerverifiedShow Answer

In an addition polymerization reaction, the free radical initiates the reaction by:

Correct AnswerverifiedShow Answer

All of the following are true about cross-linked polymers except:

Correct AnswerverifiedShow Answer

Which of the following is true regarding addition polymerization?

Correct AnswerverifiedShow Answer

Dentures must be relined periodically because:

Correct AnswerverifiedShow Answer

The monomer will _____________ if the temperature becomes too great during the polymerization process.

Correct AnswerverifiedShow Answer

Describe how a denture is fabricated using heat-cured resin.

Correct AnswerverifiedThe technician places the cast of the ed...View AnswerShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
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Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
The technician places the cast of the ed...
View Answer