Chapter 11 Review Questions Flashcards
A gold alloy that is 50% gold has how many karats? A. 24 B. 18 C. 14 D. 12
D.
The ADA recognizes which three major categories of alloys?
A. High noble, noble, and low noble
B. High noble, noble, and base metal
C. Precious, semiprecious, and nonprecious
D. Class I, II, and III
B.
High-noble metal classification must contain what percent by weight of gold? A. 40% B. 60% C. 75% D. 90%
A.
Noble metal elements include all of the following except? A. Silver B. Gold C. Palladium D. Platinum
A.
How does porcelain bond to metal alloys?
A. By fusing to oxides formed on the surface of the metal
B. By putting many small holes in the metal surface
C. By the use of metal bonding adhesive systems
D. By melting the surface of the metal and embedding the porcelain in it
A.
Metal that is formed by casting into an ingot or bar and then is altered in its form by extruding or pressing it is known as? A. Stainless steel B. Wrought metal C. Milled metal D. Transformed metal
B.
High-noble alloys usually have which metals added to increase their hardness? A. Silver or copper B. Nickel or beryllium C. Iron or aluminum D. Chromium or cobalt
A.
Which type of orthodontic wire has the most springiness and tendency to maintain its original shape? A. Stainless steel B. Cobalt-chrome nickel C. Gold D. Nickel-titanium (nitinol)
D.
Allergy to nickel
A. Occurs in less than 3% of the population
B. Is seen only in the oral cavity
C. Occurs 10 times more often in woman then in men
D. Is associated more often with orthodontic wire than with crowns
C.
Solder has all of the following uses except?
A. Adding a contact to a crown
B. Joining a pontic to a bridge retainer
C. Repairing a hole in the occlusal surface of a crown discovered in a patient at the periodic oral examination
D. Joining a wire loop to a band to make a space retainer
C.
The purpose of a flux used during soldering is to
A. Lower the melting point of the solder
B. Make the solder harden quickly
C. Prevent the solder from flowing to areas where the solder is not needed
D. Remove oxides form the surfaces of the metals to be soldered so the solder can flow and wet the surfaces better
D.
Performed metal posts are available in all of the following materials except? A. Gold B. Stainless steel C. Titanium D. Titanium alloy
A.
The purpose of a post is to A. Strengthen the root B. Put a permanent seal over the root canal filing material C. Strengthen the core material D. Retain the core material
D.
An all-metal crown that is yellow in color has which of the following?
A. A high gold contrast
B. A high copper contrast
C. A high palladium contrast
D. Can’t tell the compositing from the color
D.
Which one of the following statements about cast posts is false?
A. They may be formed from a wax or acrylic resin pattern.
B. They can be cast using high-noble, noble, or base-metal alloys
C. They usually have the core already attached to the post
D. They are used in practice far more often than performed posts
D.
