Question 1

Small organic compounds called ____________ chemically link into long chains of repeating subunits called ____________.

Accepted Answer

A)  monomers; methacrylates 
B)  polymers; methacrylates 
C)  polymers; monomers 
D)  monomers; polymers 
A)  monomers; methacrylates 
B)  polymers; methacrylates 
C)  polymers; monomers 
D)  monomers; polymers D

Question 2

Chemical-cured denture materials are initiated using ________ in the monomer liquid that mixes with the benzoyl peroxide in the polymer powder.

Accepted Answer

A)  fillers 
B)  plasticizers 
C)  accelerators 
D)  free radicals 
A)  fillers 
B)  plasticizers 
C)  accelerators 
D)  free radicals C

Question 3

Which of the following is correct regarding cross-linked acrylic polymers?

Accepted Answer

A)  More rigid 
B)  Less soluble 
C)  Less temperature resistant 
D)  Only A and B 
E)  Only B and C 
A)  More rigid 
B)  Less soluble 
C)  Less temperature resistant 
D)  Only A and B 
E)  Only B and C D

Question 4

Which of the following is correct about maxillofacial prostheses?

Accepted Answer

A)  They are inflexible and difficult to retain. 
B)  The edges are thick and esthetics are poor. 
C)  Difficult to match a person's skin tone and coloring. 
D)  Materials with better properties have not been developed since the late 1980s. 
A)  They are inflexible and difficult to retain. 
B)  The edges are thick and esthetics are poor. 
C)  Difficult to match a person's skin tone and coloring. 
D)  Materials with better properties have not been developed since the late 1980s.

Question 5

The denture base resin mixture should be _______ when it is used to pack the denture flask.

Accepted Answer

A)  sticky 
B)  grainy 
C)  doughy 
D)  rubbery 
A)  sticky 
B)  grainy 
C)  doughy 
D)  rubbery

Question 6

How should dentures be cared for when removed from the mouth?

Accepted Answer

A)  Stored in water 
B)  Stored in rubbing alcohol 
C)  Boiled and then air dried to kill bacteria and fungi 
D)  Desiccated with acetone to prevent ingress of bacteria 
A)  Stored in water 
B)  Stored in rubbing alcohol 
C)  Boiled and then air dried to kill bacteria and fungi 
D)  Desiccated with acetone to prevent ingress of bacteria

Question 7

What is a homopolymer?

Accepted Answer

A)  Contains multiple types of monomers 
B)  Contains one type of monomer 
C)  Contains no monomer 
D)  Does not polymerize 
A)  Contains multiple types of monomers 
B)  Contains one type of monomer 
C)  Contains no monomer 
D)  Does not polymerize

Question 8

What advantage(s) do/does light-cured urethane dimethacrylate material have versus powder-liquid acrylic material?

Accepted Answer

A)  Lower polymerization shrinkage 
B)  Quicker fabrication time 
C)  Lower cost 
D)  A and B 
E)  A and C 
A)  Lower polymerization shrinkage 
B)  Quicker fabrication time 
C)  Lower cost 
D)  A and B 
E)  A and C

Question 9

The polymerization reaction shrinkage of acrylics approaches _____ vol %.

Accepted Answer

A)  1 
B)  3 
C)  6 
D)  12 
A)  1 
B)  3 
C)  6 
D)  12

Question 10

Which of the following statement(s) is(are) true regarding acrylic denture teeth?

Accepted Answer

A)  The coronal portion of the tooth is constructed of minimally cross-linked polymer to provide resistance to crazing when the teeth are exposed to solvents during eating. 
B)  Polymers in the gingival portion of the plastic teeth have maximal cross-linking to ensure the denture base can bond to the polymer of the denture tooth. 
C)  Cross-linking provides better wear resistance and a more solid feel when the patient chews food. 
D)  A, B, and C are true statements. 
E)  A and C are true statements. 
A)  The coronal portion of the tooth is constructed of minimally cross-linked polymer to provide resistance to crazing when the teeth are exposed to solvents during eating. 
B)  Polymers in the gingival portion of the plastic teeth have maximal cross-linking to ensure the denture base can bond to the polymer of the denture tooth. 
C)  Cross-linking provides better wear resistance and a more solid feel when the patient chews food. 
D)  A, B, and C are true statements. 
E)  A and C are true statements.

Question 11

Compare and contrast methyl methacrylate polymers with cross-linked polymers.

Accepted Answer

Poly(methyl methacrylate), or PMMA, is t

Question 12

Which of the following statements is correct about plasticizers?

Accepted Answer

A)  Liquid oils such as dibutyl phthalate will cause a PMMA to become rigid. 
B)  The chemicals in plasticizers do not participate in the polymerization process. 
C)  The chemicals do not become part of the polymer strands but are trapped in the network. 
D)  Only A and B are correct. 
E)  Only B and C are correct. 
A)  Liquid oils such as dibutyl phthalate will cause a PMMA to become rigid. 
B)  The chemicals in plasticizers do not participate in the polymerization process. 
C)  The chemicals do not become part of the polymer strands but are trapped in the network. 
D)  Only A and B are correct. 
E)  Only B and C are correct.

Question 13

Removable partial dentures use _______-linked poly(methyl methacrylate) homopolymer.

Accepted Answer

A)  unfilled; non-cross 
B)  filled; non-cross 
C)  unfilled; cross 
D)  filled; cross 
A)  unfilled; non-cross 
B)  filled; non-cross 
C)  unfilled; cross 
D)  filled; cross

Question 14

Which of the following is the most common type of chemical reaction used to form polymers used for dental restorations?

Accepted Answer

A)  Condensation to form epoxy polymers 
B)  Ring opening to form epoxy polymers 
C)  Ring opening to form silicone polymers 
D)  Condensation to form silicone polymers 
E)  Free-radical addition to form acrylic polymers 
A)  Condensation to form epoxy polymers 
B)  Ring opening to form epoxy polymers 
C)  Ring opening to form silicone polymers 
D)  Condensation to form silicone polymers 
E)  Free-radical addition to form acrylic polymers

Question 15

Which of the following is correct about acrylic polymers used for most dentures?

Accepted Answer

A)  Are low in strength 
B)  Have a low modulus of elasticity 
C)  Have a high modulus of elasticity 
D)  A and B 
E)  A and C 
A)  Are low in strength 
B)  Have a low modulus of elasticity 
C)  Have a high modulus of elasticity 
D)  A and B 
E)  A and C

Question 16

Which of the following statements is true of Bis-GMA-based polymers used to fabricate temporary crowns or bridges?

Accepted Answer

A)  Lower cost than non-cross-linked acrylic polymers 
B)  May be light-cured, chemical-cured, or dual-cured 
C)  Are more difficult to trim than acrylic polymers 
D)  Do not wear as well as acrylic polymers 
A)  Lower cost than non-cross-linked acrylic polymers 
B)  May be light-cured, chemical-cured, or dual-cured 
C)  Are more difficult to trim than acrylic polymers 
D)  Do not wear as well as acrylic polymers

Question 17

Resin composite temporary materials are chemical cured. Resin composite temporary crowns wear better than their acrylic counterparts.

Accepted Answer

A)  Statement 1 is correct; statement 2 is correct. 
B)  Statement 1 is correct; statement 2 is incorrect. 
C)  Statement 1 is incorrect; statement 2 is correct. 
D)  Statement 1 is incorrect; statement 2 is incorrect. 
A)  Statement 1 is correct; statement 2 is correct. 
B)  Statement 1 is correct; statement 2 is incorrect. 
C)  Statement 1 is incorrect; statement 2 is correct. 
D)  Statement 1 is incorrect; statement 2 is incorrect.

Question 18

Not all monomers may be able to participate in the polymerization reaction. Any unreacted residual monomer in the polymer will not have significant clinical consequences.

Accepted Answer

A)  Statement 1 is correct; statement 2 is correct. 
B)  Statement 1 is correct; statement 2 is incorrect. 
C)  Statement 1 is incorrect; statement 2 is correct. 
D)  Statement 1 is incorrect; statement 2 is incorrect. 
A)  Statement 1 is correct; statement 2 is correct. 
B)  Statement 1 is correct; statement 2 is incorrect. 
C)  Statement 1 is incorrect; statement 2 is correct. 
D)  Statement 1 is incorrect; statement 2 is incorrect.

Question 19

Which of the following statement(s) is(are) true of denture soft liners?

Accepted Answer

A)  They may be used for patients with severe undercuts of the edentulous ridges. 
B)  Silicone liners harden as time passes, because they contain plasticizer. 
C)  The hardness of the long-term acrylic materials increases slowly as the plasticizer is leached out by exposure to oral fluids. 
D)  A, B, and C are true statements. 
E)  A and C are true statements. 
A)  They may be used for patients with severe undercuts of the edentulous ridges. 
B)  Silicone liners harden as time passes, because they contain plasticizer. 
C)  The hardness of the long-term acrylic materials increases slowly as the plasticizer is leached out by exposure to oral fluids. 
D)  A, B, and C are true statements. 
E)  A and C are true statements.

Question 20

Increased salivary viscosity does not allow good wetting of the denture polymer. Increased salivary viscosity leads to impaired retention of the denture.

Accepted Answer

A)  Statement 1 is correct; statement 2 is correct. 
B)  Statement 1 is correct; statement 2 is incorrect. 
C)  Statement 1 is incorrect; statement 2 correct. 
D)  Statement 1 is incorrect; statement 2 is incorrect. 
A)  Statement 1 is correct; statement 2 is correct. 
B)  Statement 1 is correct; statement 2 is incorrect. 
C)  Statement 1 is incorrect; statement 2 correct. 
D)  Statement 1 is incorrect; statement 2 is incorrect.

Small organic compounds called chemically link into long chains of repeating subunits called .

Chemical-cured denture materials are initiated using ________ in the monomer liquid that mixes with the benzoyl peroxide in the polymer powder.

Which of the following is correct regarding cross-linked acrylic polymers?

Which of the following is correct about maxillofacial prostheses?

The denture base resin mixture should be _______ when it is used to pack the denture flask.

How should dentures be cared for when removed from the mouth?

What is a homopolymer?

What advantage(s) do/does light-cured urethane dimethacrylate material have versus powder-liquid acrylic material?

The polymerization reaction shrinkage of acrylics approaches _____ vol %.

Which of the following statement(s) is(are) true regarding acrylic denture teeth?

Compare and contrast methyl methacrylate polymers with cross-linked polymers.

Which of the following statements is correct about plasticizers?

Removable partial dentures use _______-linked poly(methyl methacrylate) homopolymer.

Which of the following is the most common type of chemical reaction used to form polymers used for dental restorations?

Which of the following is correct about acrylic polymers used for most dentures?

Which of the following statements is true of Bis-GMA-based polymers used to fabricate temporary crowns or bridges?

Resin composite temporary materials are chemical cured. Resin composite temporary crowns wear better than their acrylic counterparts.

Not all monomers may be able to participate in the polymerization reaction. Any unreacted residual monomer in the polymer will not have significant clinical consequences.

Which of the following statement(s) is(are) true of denture soft liners?

Increased salivary viscosity does not allow good wetting of the denture polymer. Increased salivary viscosity leads to impaired retention of the denture.

Introduction to Restorative Dental Materials

Properties of Materials

Preventive Dental Materials

Direct Esthetic Restorative Materials

Dental Amalgam

Finishing, Polishing, and Cleansing Materials

Cements

Impression Materials

Model and Die Materials

Waxes

Casting Alloys, Wrought Alloys, and Solders

Casting, Soldering, and Welding

Dental Ceramics

Dental Implants

Filters

Exam 13: Polymers in Prosthodontics

Small organic compounds called ____________ chemically link into long chains of repeating subunits called ____________.

Chemical-cured denture materials are initiated using ________ in the monomer liquid that mixes with the benzoyl peroxide in the polymer powder.

Which of the following is correct regarding cross-linked acrylic polymers?

Which of the following is correct about maxillofacial prostheses?

The denture base resin mixture should be _______ when it is used to pack the denture flask.

How should dentures be cared for when removed from the mouth?

What is a homopolymer?

What advantage(s) do/does light-cured urethane dimethacrylate material have versus powder-liquid acrylic material?

The polymerization reaction shrinkage of acrylics approaches _____ vol %.

Which of the following statement(s) is(are) true regarding acrylic denture teeth?

Compare and contrast methyl methacrylate polymers with cross-linked polymers.

Which of the following statements is correct about plasticizers?

Removable partial dentures use _______-linked poly(methyl methacrylate) homopolymer.

Which of the following is the most common type of chemical reaction used to form polymers used for dental restorations?

Which of the following is correct about acrylic polymers used for most dentures?

Which of the following statements is true of Bis-GMA-based polymers used to fabricate temporary crowns or bridges?

Resin composite temporary materials are chemical cured. Resin composite temporary crowns wear better than their acrylic counterparts.

Not all monomers may be able to participate in the polymerization reaction. Any unreacted residual monomer in the polymer will not have significant clinical consequences.

Which of the following statement(s) is(are) true of denture soft liners?

Increased salivary viscosity does not allow good wetting of the denture polymer. Increased salivary viscosity leads to impaired retention of the denture.

Introduction to Restorative Dental Materials

Properties of Materials

Preventive Dental Materials

Direct Esthetic Restorative Materials

Dental Amalgam

Finishing, Polishing, and Cleansing Materials

Cements

Impression Materials

Model and Die Materials

Waxes

Casting Alloys, Wrought Alloys, and Solders

Casting, Soldering, and Welding

Dental Ceramics

Dental Implants

Filters

Small organic compounds called chemically link into long chains of repeating subunits called .