Question 1

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)  All of the above 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)  All of the above are correct. 
E)  Only B and C are correct.

Question 2

During denture fabrication,a custom impression tray is typically used to obtain a final impression during the _____ appointment.

Accepted Answer

A)  first 
B)  second 
C)  third 
D)  fourth 
E)  fifth 
A)  first 
B)  second 
C)  third 
D)  fourth 
E)  fifth

Question 3

Advantages of light-cured urethane dimethacrylate material versus powder-liquid acrylic material include:

Accepted Answer

A)  lower polymerization shrinkage. 
B)  lower cost. 
C)  quicker fabrication time. 
D)  A, B, and C. 
E)  A and C. 
A)  lower polymerization shrinkage. 
B)  lower cost. 
C)  quicker fabrication time. 
D)  A, B, and C. 
E)  A and C.

Question 4

Fillers are particles that are often bonded to the polymer network to:

Accepted Answer

A)  increase strength. 
B)  reduce water sorption. 
C)  change the color or transparency. 
D)  do all of the above. 
E)  do only A and B. 
A)  increase strength. 
B)  reduce water sorption. 
C)  change the color or transparency. 
D)  do all of the above. 
E)  do only A and B.

Question 5

When removed from the mouth,dentures:

Accepted Answer

A)  should be boiled and then air dried to kill bacteria and fungi. 
B)  are best stored in water. 
C)  should be stored in rubbing alcohol. 
D)  should be desiccated with acetone to prevent ingress of bacteria. 
A)  should be boiled and then air dried to kill bacteria and fungi. 
B)  are best stored in water. 
C)  should be stored in rubbing alcohol. 
D)  should be desiccated with acetone to prevent ingress of bacteria.

Question 6

Denture teeth made of acrylic and modified acrylic polymers have replaced ceramic teeth because acrylic teeth:

Accepted Answer

A)  do not wear natural opposing teeth. 
B)  mechanically bond to the acrylic denture base. 
C)  better absorb occlusal forces and preserve the edentulous ridge. 
D)  A, B, and C. 
E)  A and C. 
A)  do not wear natural opposing teeth. 
B)  mechanically bond to the acrylic denture base. 
C)  better absorb occlusal forces and preserve the edentulous ridge. 
D)  A, B, and C. 
E)  A and C.

Question 7

Which of the following statements is correct regarding addition polymerization?

Accepted Answer

A)  It has a high exothermic reaction. 
B)  It has a low exothermic reaction. 
C)  It does not create by-products. 
D)  All of the above are correct. 
E)  Only A and C are correct. 
A)  It has a high exothermic reaction. 
B)  It has a low exothermic reaction. 
C)  It does not create by-products. 
D)  All of the above are correct. 
E)  Only A and C are correct.

Question 8

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

Accepted Answer

A)  They may be used for patients with severe undercuts of the edentulous ridges. 
B)  The hardness of the long-term acrylic materials increases slowly as the plasticizer is leached out by exposure to oral fluids. 
C)  Silicone liners do not harden as time passes, because they contain no plasticizer. 
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)  The hardness of the long-term acrylic materials increases slowly as the plasticizer is leached out by exposure to oral fluids. 
C)  Silicone liners do not harden as time passes, because they contain no plasticizer. 
D)  A, B, and C are true statements. 
E)  A and C are true statements.

Question 9

The denture base material should be _____ before packing into the flask.

Accepted Answer

A)  doughlike 
B)  grainy-sandy 
C)  sticky-stringy 
D)  viscous-flowing 
A)  doughlike 
B)  grainy-sandy 
C)  sticky-stringy 
D)  viscous-flowing

Question 10

Copolymers contain two or more different polymers.Copolymers are used in dentures,mouth protectors,and restorative composites.

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 11

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 12

Cross-linked acrylic polymers are _____ than their non-cross-linked counterparts.

Accepted Answer

A)  less rigid 
B)  more temperature resistant 
C)  more soluble 
D)  A, B, and C 
E)  A and C 
A)  less rigid 
B)  more temperature resistant 
C)  more soluble 
D)  A, B, and C 
E)  A and C

Question 13

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 14

The process of linking monomers into long chains of polymers is known as:

Accepted Answer

A)  poly(methyl methacrylate). 
B)  polymerization. 
C)  pickling. 
D)  PMMA. 
A)  poly(methyl methacrylate). 
B)  polymerization. 
C)  pickling. 
D)  PMMA.

Question 15

Which of the following statements is true of the process of polymerization?

Accepted Answer

A)  Polymerization is a chemical reaction that links small inorganic compounds called monomers into long chains of repeating monomer subunits. 
B)  Polymers with high degrees of conversion have high levels of residual monomer. 
C)  Polymers that form by simple addition may not shrink as much as those that form by condensation. 
D)  Most prosthodontic polymers expand significantly as polymerization proceeds. 
A)  Polymerization is a chemical reaction that links small inorganic compounds called monomers into long chains of repeating monomer subunits. 
B)  Polymers with high degrees of conversion have high levels of residual monomer. 
C)  Polymers that form by simple addition may not shrink as much as those that form by condensation. 
D)  Most prosthodontic polymers expand significantly as polymerization proceeds.

Question 16

Acrylic polymers used for most dentures:

Accepted Answer

A)  are low in strength. 
B)  have a high modulus of elasticity. 
C)  have a low modulus of elasticity. 
D)  A and B. 
E)  A and C. 
A)  are low in strength. 
B)  have a high modulus of elasticity. 
C)  have a low modulus of elasticity. 
D)  A and B. 
E)  A and C.

Question 17

High degrees of polymerization lead to _____ rigid,_____ soluble polymer networks.

Accepted Answer

A)  more; more 
B)  less; less 
C)  more; less 
D)  less; more 
A)  more; more 
B)  less; less 
C)  more; less 
D)  less; more

Question 18

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

Which of the following statements is correct about plasticizers?

During denture fabrication,a custom impression tray is typically used to obtain a final impression during the _____ appointment.

Advantages of light-cured urethane dimethacrylate material versus powder-liquid acrylic material include:

Fillers are particles that are often bonded to the polymer network to:

When removed from the mouth,dentures:

Denture teeth made of acrylic and modified acrylic polymers have replaced ceramic teeth because acrylic teeth:

Which of the following statements is correct regarding addition polymerization?

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

The denture base material should be _____ before packing into the flask.

Copolymers contain two or more different polymers.Copolymers are used in dentures,mouth protectors,and restorative composites.

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

Cross-linked acrylic polymers are _____ than their non-cross-linked counterparts.

The polymerization reaction shrinkage of acrylics approaches _____ vol %.

The process of linking monomers into long chains of polymers is known as:

Which of the following statements is true of the process of polymerization?

Acrylic polymers used for most dentures:

High degrees of polymerization lead to _ rigid,_ soluble polymer networks.

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

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 and Soldering

Dental Ceramics

Dental Implants

Filters

Exam 13: Polymers in Prosthodontics

Which of the following statements is correct about plasticizers?

During denture fabrication,a custom impression tray is typically used to obtain a final impression during the _____ appointment.

Advantages of light-cured urethane dimethacrylate material versus powder-liquid acrylic material include:

Fillers are particles that are often bonded to the polymer network to:

When removed from the mouth,dentures:

Denture teeth made of acrylic and modified acrylic polymers have replaced ceramic teeth because acrylic teeth:

Which of the following statements is correct regarding addition polymerization?

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

The denture base material should be _____ before packing into the flask.

Copolymers contain two or more different polymers.Copolymers are used in dentures,mouth protectors,and restorative composites.

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

Cross-linked acrylic polymers are _____ than their non-cross-linked counterparts.

The polymerization reaction shrinkage of acrylics approaches _____ vol %.

The process of linking monomers into long chains of polymers is known as:

Which of the following statements is true of the process of polymerization?

Acrylic polymers used for most dentures:

High degrees of polymerization lead to _____ rigid,_____ soluble polymer networks.

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

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 and Soldering

Dental Ceramics

Dental Implants

Filters

High degrees of polymerization lead to _ rigid,_ soluble polymer networks.