Chapter 02 Oral Environment and Patient Considerations

Chapter 02  Oral Environment and Patient Considerations

Complete Chapter Questions And Answers
 

Sample Questions

MULTIPLE CHOICE

1. Some dental materials may be therapeutic in small quantities or if in contact with tissues for a short period of time. Dental materials may be irritating or toxic with longer or larger doses.
a.
Both statements are true.
b.
Both statements are false.
c.
The first statement is true, and the second statement is false.
d.
The first statement is false, and the second statement is true.

ANS: A
Some dental materials may be therapeutic in small quantities or if in contact with tissues for a short period of time but also may be irritating or toxic with longer or larger doses. Topical fluoride is of great benefit when used according to manufacturers’ directions but can be irritating to soft tissues and can even excessively etch enamel if used improperly.

REF: p. 9 TOP: Biocompatibility

2. Normal masticatory forces on the occlusal surfaces of molar teeth can increase to as much as _____ pounds per square inch on a cusp tip.
a.
280
b.
1000
c.
10,000
d.
28,000

ANS: D
Normal masticatory forces on the occlusal surfaces of molar teeth can increase to as much as 28,000 pounds per square inch on a cusp tip. Normal masticatory forces on the occlusal surfaces of molar teeth average 90 to 200 pounds. Masticatory forces decrease in incisor areas and can increase during bruxing or clenching.

REF: p. 10 TOP: Force and Stress

3. _____ force is applied when two surfaces slide against each other in opposite directions.
a.
Compressive
b.
Shearing
c.
Tensile
d.
Axial

ANS: B
Shearing force is applied when two surfaces slide against each other or in a twisting or rotating motion. An incisor used for cutting is an example of shearing forces.

REF: p. 10 TOP: Force and Stress

4. Stress is the amount of force exerted from within an object, and _____ is the amount of change that the force has produced.
a.
strain
b.
tension
c.
compression
d.
chemical bonding

ANS: C
Stress is the amount of force exerted from within an object, and strain is the amount of change that the force has produced. The normal process of chewing rarely involves only one type of stress; these combinations of stresses form complex stress combinations.

REF: p. 11 TOP: Force and Stress