Question 1

Which of the following is true concerning the use of endodontic files and reamers in dentistry?

Accepted Answer

A)  Rotary instruments are usually composed of stainless steel alloys. 
B)  Nickel-titanium files are far more flexible than stainless steel files. 
C)  Stainless steel files become more flexible as the diameter of the file increases. 
D)  Reamers are similar to files except that they have more twists in the metal and cut faster. 
A)  Rotary instruments are usually composed of stainless steel alloys. 
B)  Nickel-titanium files are far more flexible than stainless steel files. 
C)  Stainless steel files become more flexible as the diameter of the file increases. 
D)  Reamers are similar to files except that they have more twists in the metal and cut faster. B

Question 2

The higher the fineness number of a gold solder,the _____ the gold content and the _____ the melting point of the solder.

Accepted Answer

A)  higher;higher 
B)  higher;lower 
C)  lower;higher 
D)  lower;lower 
A)  higher;higher 
B)  higher;lower 
C)  lower;higher 
D)  lower;lower B

Question 3

Which of the following is true concerning grain formation in dental casting alloys?

Accepted Answer

A)  Reheating gold-based alloys will degrade the physical properties. 
B)  Reheating base-metal alloys will not degrade the physical properties. 
C)  Large crystals produce more desirable properties in the metal alloy than small crystals do. 
D)  Iridium or ruthenium is added to gold-base alloys to keep the crystals from growing too large. 
A)  Reheating gold-based alloys will degrade the physical properties. 
B)  Reheating base-metal alloys will not degrade the physical properties. 
C)  Large crystals produce more desirable properties in the metal alloy than small crystals do. 
D)  Iridium or ruthenium is added to gold-base alloys to keep the crystals from growing too large. D

Question 4

Why would zinc be added to a base-metal mixture?

Accepted Answer

A)  Provides luster 
B)  Makes it stronger 
C)  Reduces oxidation 
D)  Decreases solubility 
A)  Provides luster 
B)  Makes it stronger 
C)  Reduces oxidation 
D)  Decreases solubility

Question 5

Which of the following is a noble metal used for dental casting alloys?

Accepted Answer

A)  Silver (Ag) 
B)  Platinum (Pt) 
C)  Copper (Cu) 
D)  Titanium (Ti) 
A)  Silver (Ag) 
B)  Platinum (Pt) 
C)  Copper (Cu) 
D)  Titanium (Ti)

Question 6

Match the items with the correct description below.
-Precious metal

Accepted Answer

A) Alloy composed of non-noble metals 
B) A mixture of two or more metals 
C) Alloy containing at least 60% noble metals,40% of which must be gold 
D) Classification of metal based on its high cost 
E) Alloy composed of metals that do not corrode readily 
A) Alloy composed of non-noble metals 
B) A mixture of two or more metals 
C) Alloy containing at least 60% noble metals,40% of which must be gold 
D) Classification of metal based on its high cost 
E) Alloy composed of metals that do not corrode readily

Question 7

Which of the following metals is added to both gold and silver solders to lower the melting range?

Accepted Answer

A)  Tin 
B)  Borax 
C)  Indium 
D)  Potassium fluoride 
A)  Tin 
B)  Borax 
C)  Indium 
D)  Potassium fluoride

Question 8

What are silver solders used for?

Accepted Answer

A)  Soldering orthodontic wires 
B)  Soldering crowns and pontics 
C)  Soldering partial denture clasps 
A)  Soldering orthodontic wires 
B)  Soldering crowns and pontics 
C)  Soldering partial denture clasps

Question 9

Why is tin added to solders used in dentistry?

Accepted Answer

A)  Improve flow 
B)  Reduce oxidation 
C)  Strengthen the bond 
D)  Lower the melting point 
A)  Improve flow 
B)  Reduce oxidation 
C)  Strengthen the bond 
D)  Lower the melting point

Question 10

After the substructure for a porcelain-bonded-to-metal crown is cast in metal,why is it heated at high temperature?

Accepted Answer

A)  Anneal the metal 
B)  Reduce the grain size 
C)  Form oxides on the surface of the metal 
D)  Cause the metal to slump and adapt to the die 
A)  Anneal the metal 
B)  Reduce the grain size 
C)  Form oxides on the surface of the metal 
D)  Cause the metal to slump and adapt to the die

Question 11

What is the primary purpose of the endodontic post?

Accepted Answer

A)  Reinforce the tooth 
B)  Bond with the crown 
C)  Retain the core buildup 
D)  Fill the access for strength 
A)  Reinforce the tooth 
B)  Bond with the crown 
C)  Retain the core buildup 
D)  Fill the access for strength

Question 12

Which of the following is true concerning endodontic posts?

Accepted Answer

A)  A post is one type of dental implant. 
B)  Posts reinforce endodontically treated teeth against fracture. 
C)  Preformed posts are generally made with the core already attached. 
D)  Parallel posts have been shown to transmit less stress to the root than tapered posts. 
A)  A post is one type of dental implant. 
B)  Posts reinforce endodontically treated teeth against fracture. 
C)  Preformed posts are generally made with the core already attached. 
D)  Parallel posts have been shown to transmit less stress to the root than tapered posts.

Question 13

Which description is correct regarding palladium?

Accepted Answer

A)  Is more expensive than gold 
B)  Has poor corrosion resistance 
C)  Increases the hardness of the alloy 
D)  Is a precious metal but it is not considered noble 
A)  Is more expensive than gold 
B)  Has poor corrosion resistance 
C)  Increases the hardness of the alloy 
D)  Is a precious metal but it is not considered noble

Question 14

Of the following,which is the base metal?

Accepted Answer

A)  Gold 
B)  Gallium 
C)  Platinum 
D)  Palladium 
A)  Gold 
B)  Gallium 
C)  Platinum 
D)  Palladium

Question 15

Which of the following is true concerning nickel allergy?

Accepted Answer

A)  Men have a higher rate of allergy to nickel than do women,by a ratio of 10 to 1. 
B)  The overall allergy rate to nickel for the general population is about 1% to 3%. 
C)  It is more common to see nickel allergy in removable partial dentures than in the margins of base-metal crowns. 
D)  Some responses to nickel cause a skin reaction rather than a response in the mouth,even though the oral cavity is the source of the nickel. 
A)  Men have a higher rate of allergy to nickel than do women,by a ratio of 10 to 1. 
B)  The overall allergy rate to nickel for the general population is about 1% to 3%. 
C)  It is more common to see nickel allergy in removable partial dentures than in the margins of base-metal crowns. 
D)  Some responses to nickel cause a skin reaction rather than a response in the mouth,even though the oral cavity is the source of the nickel.

Question 16

Match the items with the correct description below.
-Alloy

Accepted Answer

A) Alloy composed of non-noble metals 
B) A mixture of two or more metals 
C) Alloy containing at least 60% noble metals,40% of which must be gold 
D) Classification of metal based on its high cost 
E) Alloy composed of metals that do not corrode readily 
A) Alloy composed of non-noble metals 
B) A mixture of two or more metals 
C) Alloy containing at least 60% noble metals,40% of which must be gold 
D) Classification of metal based on its high cost 
E) Alloy composed of metals that do not corrode readily

Question 17

What is an advantage of using a wrought metal?

Accepted Answer

A)  Easily deforms 
B)  Does not bend 
C)  Can be heated 
D)  Uses light force 
A)  Easily deforms 
B)  Does not bend 
C)  Can be heated 
D)  Uses light force

Question 18

Which of the following is the most esthetic margin for a ceramic-metal crown?

Accepted Answer

A)  Disappearing metal margin 
B)  Porcelain facial margin 
C)  All-metal margin 
D)  All-metal facing 
A)  Disappearing metal margin 
B)  Porcelain facial margin 
C)  All-metal margin 
D)  All-metal facing

Question 19

Which of the following represents the correct order for application of the porcelain layers during the creation of a porcelain-bonded-to-metal crown?
1)Incisal porcelain
2)Opaque porcelain
3)Body porcelain

Accepted Answer

A)  1,2,3 
B)  1,3,2 
C)  2,3,1 
D)  2,1,3 
A)  1,2,3 
B)  1,3,2 
C)  2,3,1 
D)  2,1,3

Question 20

Dental wrought wire is primarily used for what purpose?

Accepted Answer

A)  Clasps for removable prosthetic appliances 
B)  Wires,brackets,and bands used in orthodontics 
C)  Correcting small marginal deficiencies on onlays and crowns 
D)  Closing holes ground into the occlusal surface by adjusting the bite 
A)  Clasps for removable prosthetic appliances 
B)  Wires,brackets,and bands used in orthodontics 
C)  Correcting small marginal deficiencies on onlays and crowns 
D)  Closing holes ground into the occlusal surface by adjusting the bite

Which of the following is true concerning the use of endodontic files and reamers in dentistry?

The higher the fineness number of a gold solder,the _ the gold content and the _ the melting point of the solder.

Which of the following is true concerning grain formation in dental casting alloys?

Why would zinc be added to a base-metal mixture?

Which of the following is a noble metal used for dental casting alloys?

Match the items with the correct description below. -Precious metal

Which of the following metals is added to both gold and silver solders to lower the melting range?

What are silver solders used for?

Why is tin added to solders used in dentistry?

After the substructure for a porcelain-bonded-to-metal crown is cast in metal,why is it heated at high temperature?

What is the primary purpose of the endodontic post?

Which of the following is true concerning endodontic posts?

Which description is correct regarding palladium?

Of the following,which is the base metal?

Which of the following is true concerning nickel allergy?

Match the items with the correct description below. -Alloy

What is an advantage of using a wrought metal?

Which of the following is the most esthetic margin for a ceramic-metal crown?

Which of the following represents the correct order for application of the porcelain layers during the creation of a porcelain-bonded-to-metal crown? 1)Incisal porcelain 2)Opaque porcelain 3)Body porcelain

Dental wrought wire is primarily used for what purpose?

Introduction to Dental Materials

Oral Environment and Patient Considerations

Physical and Mechanical Properties of Dental Materials

General Handling and Safety of Dental Materials in the Dental Office

Principles of Bonding

Composites, glass Ionomers, and Compomers

Preventive and Desensitizing Materials

Teeth Whitening Materials and Procedures

Dental Ceramics

Dental Amalgam

Dental Implants

Abrasion, finishing, and Polishing

Dental Cement

Impression Materials

Gypsum and Wax Products

Polymers for Prosthetic Dentistry

Provisional Restorations

Preventive and Corrective Oral Appliances

Filters

Exam 11: Casting Metals, solders, and Wrought Metal Alloys

Which of the following is true concerning the use of endodontic files and reamers in dentistry?

The higher the fineness number of a gold solder,the _____ the gold content and the _____ the melting point of the solder.

Which of the following is true concerning grain formation in dental casting alloys?

Why would zinc be added to a base-metal mixture?

Which of the following is a noble metal used for dental casting alloys?

Match the items with the correct description below. -Precious metal

Which of the following metals is added to both gold and silver solders to lower the melting range?

What are silver solders used for?

Why is tin added to solders used in dentistry?

After the substructure for a porcelain-bonded-to-metal crown is cast in metal,why is it heated at high temperature?

What is the primary purpose of the endodontic post?

Which of the following is true concerning endodontic posts?

Which description is correct regarding palladium?

Of the following,which is the base metal?

Which of the following is true concerning nickel allergy?

Match the items with the correct description below. -Alloy

What is an advantage of using a wrought metal?

Which of the following is the most esthetic margin for a ceramic-metal crown?

Which of the following represents the correct order for application of the porcelain layers during the creation of a porcelain-bonded-to-metal crown? 1)Incisal porcelain 2)Opaque porcelain 3)Body porcelain

Dental wrought wire is primarily used for what purpose?

Introduction to Dental Materials

Oral Environment and Patient Considerations

Physical and Mechanical Properties of Dental Materials

General Handling and Safety of Dental Materials in the Dental Office

Principles of Bonding

Composites, glass Ionomers, and Compomers

Preventive and Desensitizing Materials

Teeth Whitening Materials and Procedures

Dental Ceramics

Dental Amalgam

Dental Implants

Abrasion, finishing, and Polishing

Dental Cement

Impression Materials

Gypsum and Wax Products

Polymers for Prosthetic Dentistry

Provisional Restorations

Preventive and Corrective Oral Appliances

Filters

The higher the fineness number of a gold solder,the _ the gold content and the _ the melting point of the solder.