DENTAL MATERIALS TEST 1 - CH 1, 2, 3, 4, 15, 16
1. What agency has a strictly voluntary program of approving consumer dental
products such as toothpaste, toothbrushes, and mouth rinses?: American
Dental Association (ADA)
2. What agency regulates medical devices?: U.S. Food and Drug Administration
(FDA)
3. Lowest risk materials such as examination gloves and prophy paste are
considered Class medical/dental devices.: Class I
4. Products required to meet performance standards set by the FDA or ADA,
products such as amalgam and composite materials, are considered class
medical/dental materials.: Class II
5. The most regulated medical devices, which support or sustain human life,
such as endosseus implants and bone grafting material, are considered class
medical/dental materials.: Class III
6. What are therapeutic materials?: Materials used to treat disease
7. What are auxilliary materials?: Materials used to fabricate and maintain restora-
tions, directly or indirectly
8. What is tensile force?: Force applied in opposite directions to stretch an object
9. What is shearing force?: Force applied when two surfaces slide against each
other
10. What two other forces are combined to create torsion or torque?: tension
& compression
11. What is stress?: The internal force which resists the applied force
12. What is strain?: Distortion or deformation that occurs when an object cannot
resist a force
13. What is flexural stress?: Bending caused by a combination of tension and
compression
14. What is corrosion?: Deterioration of a material caused by a chemical attack
or electrochemical reaction with dissimilar metals in the presence of a solution
containing electrolytes (such as saliva)
15. What is tarnish?: Discoloration due to oxidation of a thin layer of a metal at its
surface
16. What is galvanism?: An electrical current transmitted between two dissimilar
metals in a solution of electrolytes
17. What is percolation?: Movement of fluid in the microscopic gap of a restoration
margin as a result of differences in the expansion and contraction rates of the tooth
and the restoration with temperature changes associated with ingestion of cold or
hot fluids or foods
18. What is surface energy?: The electrical charge that attracts atoms to a surface
, DENTAL MATERIALS TEST 1 - CH 1, 2, 3, 4, 15, 16
19. What is microleakage?: Leakage of fluid and bacteria caused by microscopic
gaps that occur at the interface of the tooth and the restoration margins.
20. What is chroma?: The intensity or strength of a color
21. What is value?: How light or dark a color is. A low value indicates a darker color
22. Give 3 examples of therapeutic dental materials.: Pit and fissure sealants,
mouth guards, fluorides
23. Give 3 examples of auxiliary materials: Impression materials, gypsum, dental
waxes
24. The large occlusal surface and multi-rooted base of posterior teeth are well
suited to resist forces.: Compression
25. When biting forces are used to stretch a material, the teeth are exerting
force.: tensile
26. When we use the anterior teeth to bite into a food, we slide the mandibular
teeth forward or to the side and the maxillary teeth in the opposite direction
to cut it off, exerting forces.: shearing
27. This force is more descriptive of normal mastication.: Torsion or torque
28. What is metamerism?: Colors look different under different light sources
29. Which of the following restorative materials is the most soluble?
a. Amalgam
b. Glass ionomer
c. Porcelain
d. Acrylic: b
30. Restorative materials with values of thermal conductivity similar to enamel
include
a. gold
b. composite resin
c. amalgam
d. gold foil: b
31. Microleakage may be responsible for
a. recurrent decay
b. marginal staining
c. postoperative sensitivity
d. all of the above: d
32. Excessive film thickness may cause
a. an increase in retention
b. a decrease in marginal leakage
c. improper seating of the restoration: c
33. What are primary bonds?: Strong bonds with electronic attractions: ionic
bonds, covalent bonds, metallic bonds
1. What agency has a strictly voluntary program of approving consumer dental
products such as toothpaste, toothbrushes, and mouth rinses?: American
Dental Association (ADA)
2. What agency regulates medical devices?: U.S. Food and Drug Administration
(FDA)
3. Lowest risk materials such as examination gloves and prophy paste are
considered Class medical/dental devices.: Class I
4. Products required to meet performance standards set by the FDA or ADA,
products such as amalgam and composite materials, are considered class
medical/dental materials.: Class II
5. The most regulated medical devices, which support or sustain human life,
such as endosseus implants and bone grafting material, are considered class
medical/dental materials.: Class III
6. What are therapeutic materials?: Materials used to treat disease
7. What are auxilliary materials?: Materials used to fabricate and maintain restora-
tions, directly or indirectly
8. What is tensile force?: Force applied in opposite directions to stretch an object
9. What is shearing force?: Force applied when two surfaces slide against each
other
10. What two other forces are combined to create torsion or torque?: tension
& compression
11. What is stress?: The internal force which resists the applied force
12. What is strain?: Distortion or deformation that occurs when an object cannot
resist a force
13. What is flexural stress?: Bending caused by a combination of tension and
compression
14. What is corrosion?: Deterioration of a material caused by a chemical attack
or electrochemical reaction with dissimilar metals in the presence of a solution
containing electrolytes (such as saliva)
15. What is tarnish?: Discoloration due to oxidation of a thin layer of a metal at its
surface
16. What is galvanism?: An electrical current transmitted between two dissimilar
metals in a solution of electrolytes
17. What is percolation?: Movement of fluid in the microscopic gap of a restoration
margin as a result of differences in the expansion and contraction rates of the tooth
and the restoration with temperature changes associated with ingestion of cold or
hot fluids or foods
18. What is surface energy?: The electrical charge that attracts atoms to a surface
, DENTAL MATERIALS TEST 1 - CH 1, 2, 3, 4, 15, 16
19. What is microleakage?: Leakage of fluid and bacteria caused by microscopic
gaps that occur at the interface of the tooth and the restoration margins.
20. What is chroma?: The intensity or strength of a color
21. What is value?: How light or dark a color is. A low value indicates a darker color
22. Give 3 examples of therapeutic dental materials.: Pit and fissure sealants,
mouth guards, fluorides
23. Give 3 examples of auxiliary materials: Impression materials, gypsum, dental
waxes
24. The large occlusal surface and multi-rooted base of posterior teeth are well
suited to resist forces.: Compression
25. When biting forces are used to stretch a material, the teeth are exerting
force.: tensile
26. When we use the anterior teeth to bite into a food, we slide the mandibular
teeth forward or to the side and the maxillary teeth in the opposite direction
to cut it off, exerting forces.: shearing
27. This force is more descriptive of normal mastication.: Torsion or torque
28. What is metamerism?: Colors look different under different light sources
29. Which of the following restorative materials is the most soluble?
a. Amalgam
b. Glass ionomer
c. Porcelain
d. Acrylic: b
30. Restorative materials with values of thermal conductivity similar to enamel
include
a. gold
b. composite resin
c. amalgam
d. gold foil: b
31. Microleakage may be responsible for
a. recurrent decay
b. marginal staining
c. postoperative sensitivity
d. all of the above: d
32. Excessive film thickness may cause
a. an increase in retention
b. a decrease in marginal leakage
c. improper seating of the restoration: c
33. What are primary bonds?: Strong bonds with electronic attractions: ionic
bonds, covalent bonds, metallic bonds
