1. the primary reason for triturating amalgam is:
A. To bring the mercury in contact with the alloy particles
B. To clean the surfaces of the particles by slight abrasion
C. Both of the above D. neither of the above
2. Touching the amalgam with the fingertips after trituration
A. Exerts no effect on the amalgam
B. May cause contamination and affect the physical properties
C. Is indicated to mold the amalgam
D. None of the above
3. In a cavity preparation
A. The outline form is dictated, in part, by the carious involvement
B. The restoration form may be compromised
C. Retention is not important in an amalgam restoration
D. None of the above
4. The retention form in an amalgam restoration
A. Is always parallel to the horizontal axis
B. Should be parallel to the roof of the pulp chamber
C. Neither of the above
5. The retention form in an amalgam restoration
A. Is placed in the enamel if possible
B. Is placed in the dentin D. none of the above
C. May be omitted if the support of a cusp is endangered
6. Acrylic resin restorations
A. Should be avoided when possible
B. May be loosened by excessive stress
C. Have a coefficient of expansion approximately seven times that of tooth structure
D. All of the above E. none of the above
7. In mixing a silicate cement:
A. The slab should be heated to about 100 degree F.
B. The slab should be cooled to temperature just above the dew point
C. The mix may be carried out on dry white paper
D. None of the above
8. which of the following base materials are contraindicated under an acrylic resin material?
A. Calcium hydroxide C. Zinc oxyphosphate cement
B. Eugenol base D. no contraindications
9. which of the following is done to minimize a gingival margin discrepancy between a tooth preparation and a cemented MOD casting?
A. a hard wax is used to form the pattern since it gives the most accurate reproduction
B. the pattern is formed directly on the preparation
C. composite resin is used as the sealing agent.
D. the die is relieved in the laboratory
E. a gingival bevel is placed on cavosurface margins.
10. Which of the listed instruments could be used for placing a proximal bevel on an inlay, onlay or shoulder preparation?
A. flame shaped diamond C. 700 fissure bur
B. Wedelstaedt chisel D. cleoid discoid
E. Gethro knife F. two of the above
11. the contact time of gingival retraction cord and chemical used is:
A. 1 min D. 10 min
B. 2 min E. none of the above
C. 3 min
12. Reversible hydrocolloid impression should be poured:
A. immediately
B. 30 minutes after taking the impression
C. 60 minutes after taking the impression.
D. when convenient after placing in a humidor
E. none of the above.
13. Castings are placed in a solution of hydrochloric or sulfuric acid and equal parts of water which is a process known as pickling. This process:
A. removes bubbles
B. removes oxides and improves the color of the casting
C. removes an incremental amount of gold which aids in seating the restoration.
D. all of the above
E. none of the above
14. A carious process, often involving a large number of teeth, which is rapid and often results in pulpal exposures is termed:
A. primary C. Chronic
B. acute D. secondary
15. A carious process, in which the decalcified dentin is dark brown in color and leathery in consistency, is termed.
A. primary C. chronic
B. acute D. secondary
16. Secondary caries
A. are lesions that are always dark brown in color and have a leathery consistency
B. is best described because of location rather than the extent of damage
C. is observed around the edges of restoration
D. is rampant
17. Dentin contains about:
A. 70% mineral, 20% organic, 10% water
B. 20% mineral, 70% organic, 10% water
C. 10% mineral, 80% organic, 10% water
D. 50% mineral, 50% organic
18. different types of restorative materials
A. are placed in the same cavity outline extensions
B. Are used with different cavity outline extensions.
C. can be mixed in the same cavity preparation
D. should never be used on the same tooth.
No comments:
Post a Comment