Question 1

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; lowerE) All of the above
F) A) and B)

Question 2

Which of the following base metals has the highest incidence of allergic response?

Accepted Answer

A)   Nickel
B)   Chromium
C)   Beryllium
D)   GalliumE) None of the above
F) B) and C)

Question 3

Match the items with the correct description below.
-Base-metal 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 readilyF) D) and E)
G) None of the above

Question 4

The metals in porcelain bonding alloys are selected and blended so they have which of the following properties?

Accepted Answer

A)   They have the ability to withstand the low temperatures at which porcelain is fired without distorting or melting.
B)   They have a higher thermal expansion than gold alloys used for all-metal crowns.
C)   Small amounts of metals such as indium, iron, tin, or gallium are added to form oxides on the metal surface to which the porcelain will bond.
D)   Titanium and titanium alloys are added for easy handling.E) A) and B)
F) All of the above

Question 5

Match the items with the correct description below.
-High-noble 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 readilyF) C) and D)
G) B) and E)

Question 6

Of the following, which is the base metal?

Accepted Answer

A)   Palladium
B)   Gold
C)   Platinum
D)   GalliumE) None of the above
F) A) and B)

Question 7

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

Accepted Answer

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

Question 8

The primary purpose of the endodontic post is to:

Accepted Answer

A)   retain the core buildup
B)   reinforce the tooth
C)   bond with the crown
D)   fill the access for strengthE) All of the above
F) B) and C)

Question 9

Flux is used with solder to:

Accepted Answer

A)   increase adhesion
B)   prevent cracking
C)   remove oxidation
D)   reduce solder flowE) A) and B)
F) A) and C)

Question 10

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

Accepted Answer

A)   Borax
B)   Potassium fluoride
C)   Tin
D)   IndiumE) All of the above
F) B) and D)

Question 11

During conventional root canal therapy, the root canal space is sealed with _________ so that bacteria cannot grow in the space.

Accepted Answer

A)   silver amalgam
B)   zinc phosphate
C)   gutta percha
D)   chlorobutanolE) B) and C)
F) A) and C)

Question 12

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 readilyF) All of the above
G) B) and D) B

Question 13

Palladium:

Accepted Answer

A)   has poor corrosion resistance
B)   increases the hardness of the alloy
C)   is more expensive than gold
D)   is a precious metal but it is not considered nobleE) None of the above
F) A) and B)

Question 14

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 facingE) A) and B)
F) B) and C)

Question 15

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) E) A) and B)
F) B) and C)

Question 16

Which of the following statements is true of noble dental casting alloys?

Accepted Answer

A)   They must contain at least 60% by weight noble alloys, of which gold must account for at least 40% by weight.
B)   They require gold and must contain at least 25% noble metals by weight.
C)   They do not require any gold but must contain at least 25% noble metals by weight.
D)   They do not require gold and require less than 25% by weight of noble metals.E) A) and B)
F) C) and D)

Question 17

Silver solders are used for:

Accepted Answer

A)   soldering orthodontic wires
B)   soldering crowns and pontics
C)   soldering partial denture claspsD) None of the above
E) B) and C) A

Question 18

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

Accepted Answer

A)   reduce the grain size
B)   anneal the metal
C)   form oxides on the surface of the metal
D)   cause the metal to slump and adapt to the dieE) A) and B)
F) B) and C) C

Question 19

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.E) All of the above
F) A) and D)

Question 20

Dental wrought wire is primarily used for:

Accepted Answer

A)   wires, brackets, and bands used in orthodontics
B)   clasps for removable prosthetic appliances
C)   closing holes ground into the occlusal surface by adjusting the bite
D)   correcting small marginal deficiencies on onlays and crownsE) B) and D)
F) B) and C)

Exam 10: Casting Alloys, Solders, and Wrought Metal Alloys

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

Correct AnswerverifiedShow Answer

Which of the following base metals has the highest incidence of allergic response?

Correct AnswerverifiedShow Answer

Match the items with the correct description below. -Base-metal alloy

Correct AnswerverifiedShow Answer

The metals in porcelain bonding alloys are selected and blended so they have which of the following properties?

Correct AnswerverifiedShow Answer

Match the items with the correct description below. -High-noble alloy

Correct AnswerverifiedShow Answer

Of the following, which is the base metal?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The primary purpose of the endodontic post is to:

Correct AnswerverifiedShow Answer

Flux is used with solder to:

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

During conventional root canal therapy, the root canal space is sealed with _________ so that bacteria cannot grow in the space.

Correct AnswerverifiedShow Answer

Match the items with the correct description below. -Alloy

Correct AnswerverifiedB

Palladium:

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following statements is true of noble dental casting alloys?

Correct AnswerverifiedShow Answer

Silver solders are used for:

Correct AnswerverifiedA

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

Correct AnswerverifiedC

Which of the following is true concerning nickel allergy?

Correct AnswerverifiedShow Answer

Dental wrought wire is primarily used for:

Correct AnswerverifiedShow Answer

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

Correct Answer
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B

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A

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