Question 1

What does leucite do to porcelain?

Accepted Answer

A)  Makes it stronger 
B)  Makes it lower fusing 
C)  Makes it more translucent 
D)  Makes it lower expanding 
A)  Makes it stronger 
B)  Makes it lower fusing 
C)  Makes it more translucent 
D)  Makes it lower expanding

Question 2

Which of the following is not true about ceramic restorations?

Accepted Answer

A)  Esthetically superior 
B)  Easily fixed if broken 
C)  Few biocompatibility issues 
D)  Significant wear of the antagonist 
A)  Esthetically superior 
B)  Easily fixed if broken 
C)  Few biocompatibility issues 
D)  Significant wear of the antagonist

Question 3

What is the common cause of failure of a ceramic-alloy bond?

Accepted Answer

A)  Formation of an oxide layer that is too thick 
B)  Failure within the ceramic layer itself 
C)  Failure within the alloy casting 
D)  An inadequate oxide layer 
A)  Formation of an oxide layer that is too thick 
B)  Failure within the ceramic layer itself 
C)  Failure within the alloy casting 
D)  An inadequate oxide layer

Question 4

At the atomic level, ceramics are composed of metal-_______ ionic bonds.

Accepted Answer

A)  hydrogen 
B)  glycerol 
C)  oxygen 
D)  silica 
A)  hydrogen 
B)  glycerol 
C)  oxygen 
D)  silica

Question 5

Which material is used intraorally to repair fractured ceramic restorations?

Accepted Answer

A)  Ceramic 
B)  Hybrid ionomer 
C)  Resin composite 
D)  Methyl methacrylate 
A)  Ceramic 
B)  Hybrid ionomer 
C)  Resin composite 
D)  Methyl methacrylate

Question 6

The decision to use an all-ceramic restoration is most controversial for which restoration listed below?

Accepted Answer

A)  Anterior crowns 
B)  Anterior bridges 
C)  Posterior crowns 
D)  Posterior bridges 
A)  Anterior crowns 
B)  Anterior bridges 
C)  Posterior crowns 
D)  Posterior bridges

Question 7

What is leucite?

Accepted Answer

A)  Crystalline phase that forms under certain conditions within the glassy phase of dental ceramics 
B)  Oxide layer that forms on the surface of the alloy substructure 
C)  By-product that forms on the surface of dental porcelain 
D)  Amorphous non-crystalline phase in dental ceramics 
A)  Crystalline phase that forms under certain conditions within the glassy phase of dental ceramics 
B)  Oxide layer that forms on the surface of the alloy substructure 
C)  By-product that forms on the surface of dental porcelain 
D)  Amorphous non-crystalline phase in dental ceramics

Question 8

Veneers are bonded to the tooth using __________ cements and acid-etching techniques.

Accepted Answer

A)  resin-based 
B)  chemical-cured 
C)  shade-controlled 
D)  A, B, and C are all correct. 
E)  Only A and C are correct. 
A)  resin-based 
B)  chemical-cured 
C)  shade-controlled 
D)  A, B, and C are all correct. 
E)  Only A and C are correct.

Question 9

Which of the following statement(s) is(are) true of fluxes formed during the fabrication of dental ceramics?

Accepted Answer

A)  Fluxes cause the ceramic to be more opaque. 
B)  Fluxes require a higher fusing temperature. 
C)  Fluxes disrupt the crystal lattice. 
D)  A, B, and C are true statements. 
E)  A and C are true statements. 
A)  Fluxes cause the ceramic to be more opaque. 
B)  Fluxes require a higher fusing temperature. 
C)  Fluxes disrupt the crystal lattice. 
D)  A, B, and C are true statements. 
E)  A and C are true statements.

Question 10

Why is the alloy substructure degassed in a ceramic oven during fabrication of a ceramic-alloy restoration?

Accepted Answer

A)  Remove organic impurities from the alloy surface. 
B)  Promote the formation of an oxide layer on the alloy. 
C)  Remove hydrogen cyanide gas formed during the metal casting process. 
D)  A, B, and C are all correct. 
E)  Only A and B are correct. 
A)  Remove organic impurities from the alloy surface. 
B)  Promote the formation of an oxide layer on the alloy. 
C)  Remove hydrogen cyanide gas formed during the metal casting process. 
D)  A, B, and C are all correct. 
E)  Only A and B are correct.

Question 11

Ceramics exhibit extremely _____ compressive strengths and moduli but relatively _____ tensile strengths and elongation.

Accepted Answer

A)  low; low 
B)  low; high 
C)  high; low 
D)  high; high 
A)  low; low 
B)  low; high 
C)  high; low 
D)  high; high

Question 12

What is porcelain composed of?

Accepted Answer

A)  Feldspar 
B)  Quartz 
C)  Silica 
D)  A and B are correct. 
E)  B and C are correct. 
A)  Feldspar 
B)  Quartz 
C)  Silica 
D)  A and B are correct. 
E)  B and C are correct.

Question 13

What is the most common application of ceramics in dentistry today?

Accepted Answer

A)  Denture teeth 
B)  Porcelain-jacket restorations 
C)  Ceramic-alloy restorations 
D)  All-ceramic restorations 
A)  Denture teeth 
B)  Porcelain-jacket restorations 
C)  Ceramic-alloy restorations 
D)  All-ceramic restorations

Question 14

During firing, what is the process called when the particles of ceramic melt together at their edges?

Accepted Answer

A)  Rheology 
B)  Sintering 
C)  Abfraction 
D)  Condensation 
A)  Rheology 
B)  Sintering 
C)  Abfraction 
D)  Condensation

Question 15

How are glassy porcelains classified?

Accepted Answer

A)  Fusing temperature 
B)  Sintering temperature 
C)  Coefficient of thermal expansion 
D)  A, B, and C are all factors. 
E)  Only A and B are correct. 
A)  Fusing temperature 
B)  Sintering temperature 
C)  Coefficient of thermal expansion 
D)  A, B, and C are all factors. 
E)  Only A and B are correct.

Question 16

An all-ceramic crown is often composed of a low-strength opaque ceramic core with a bonded veneer of a stronger but translucent glassy or glass-dominated ceramic. Newer designs have only high-strength crystalline or crystalline-dominated ceramics.

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 17

What is the principal advantage of any all-ceramic crown in contrast to a ceramic-alloy crown?

Accepted Answer

A)  Simpler manufacturing process 
B)  Superior fracture resistance 
C)  Excellent esthetics 
D)  Lower cost 
A)  Simpler manufacturing process 
B)  Superior fracture resistance 
C)  Excellent esthetics 
D)  Lower cost

Question 18

Which of the following statements is(are) true of all-ceramic restorations that use a high-strength core ceramic beneath traditional porcelains?

Accepted Answer

A)  The core ceramic is used for the entire restoration. 
B)  The high-strength core replaces the alloy substructure. 
C)  CAD-CAM techniques may be used to design and cut the core material out of a block of high-strength starting material. 
D)  A and C are correct. 
E)  B and C are correct. 
A)  The core ceramic is used for the entire restoration. 
B)  The high-strength core replaces the alloy substructure. 
C)  CAD-CAM techniques may be used to design and cut the core material out of a block of high-strength starting material. 
D)  A and C are correct. 
E)  B and C are correct.

Question 19

Which common metallic element(s) occurs in ceramics in combination with oxygen?

Accepted Answer

A)  Silica 
B)  Zirconium 
C)  Aluminum 
D)  A and C are correct. 
E)  B and C are correct. 
A)  Silica 
B)  Zirconium 
C)  Aluminum 
D)  A and C are correct. 
E)  B and C are correct.

Question 20

Which of the following are other techniques used to form ceramic restorations?

Accepted Answer

A)  Casting 
B)  Stacking 
C)  Pickling 
D)  Sintering 
A)  Casting 
B)  Stacking 
C)  Pickling 
D)  Sintering

What does leucite do to porcelain?

Which of the following is not true about ceramic restorations?

What is the common cause of failure of a ceramic-alloy bond?

At the atomic level, ceramics are composed of metal-_______ ionic bonds.

Which material is used intraorally to repair fractured ceramic restorations?

The decision to use an all-ceramic restoration is most controversial for which restoration listed below?

What is leucite?

Veneers are bonded to the tooth using __________ cements and acid-etching techniques.

Which of the following statement(s) is(are) true of fluxes formed during the fabrication of dental ceramics?

Why is the alloy substructure degassed in a ceramic oven during fabrication of a ceramic-alloy restoration?

Ceramics exhibit extremely _ compressive strengths and moduli but relatively _ tensile strengths and elongation.

What is porcelain composed of?

What is the most common application of ceramics in dentistry today?

During firing, what is the process called when the particles of ceramic melt together at their edges?

How are glassy porcelains classified?

An all-ceramic crown is often composed of a low-strength opaque ceramic core with a bonded veneer of a stronger but translucent glassy or glass-dominated ceramic. Newer designs have only high-strength crystalline or crystalline-dominated ceramics.

What is the principal advantage of any all-ceramic crown in contrast to a ceramic-alloy crown?

Which of the following statements is(are) true of all-ceramic restorations that use a high-strength core ceramic beneath traditional porcelains?

Which common metallic element(s) occurs in ceramics in combination with oxygen?

Which of the following are other techniques used to form ceramic restorations?

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

Polymers in Prosthodontics

Dental Implants

Filters

Exam 14: Dental Ceramics

What does leucite do to porcelain?

Which of the following is not true about ceramic restorations?

What is the common cause of failure of a ceramic-alloy bond?

At the atomic level, ceramics are composed of metal-_______ ionic bonds.

Which material is used intraorally to repair fractured ceramic restorations?

The decision to use an all-ceramic restoration is most controversial for which restoration listed below?

What is leucite?

Veneers are bonded to the tooth using __________ cements and acid-etching techniques.

Which of the following statement(s) is(are) true of fluxes formed during the fabrication of dental ceramics?

Why is the alloy substructure degassed in a ceramic oven during fabrication of a ceramic-alloy restoration?

Ceramics exhibit extremely _____ compressive strengths and moduli but relatively _____ tensile strengths and elongation.

What is porcelain composed of?

What is the most common application of ceramics in dentistry today?

During firing, what is the process called when the particles of ceramic melt together at their edges?

How are glassy porcelains classified?

An all-ceramic crown is often composed of a low-strength opaque ceramic core with a bonded veneer of a stronger but translucent glassy or glass-dominated ceramic. Newer designs have only high-strength crystalline or crystalline-dominated ceramics.

What is the principal advantage of any all-ceramic crown in contrast to a ceramic-alloy crown?

Which of the following statements is(are) true of all-ceramic restorations that use a high-strength core ceramic beneath traditional porcelains?

Which common metallic element(s) occurs in ceramics in combination with oxygen?

Which of the following are other techniques used to form ceramic restorations?

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

Polymers in Prosthodontics

Dental Implants

Filters

Ceramics exhibit extremely _ compressive strengths and moduli but relatively _ tensile strengths and elongation.