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1. What is the average background radiation in the U.S.?
   a. 10 microsieverts/day
   b. 100 microsieverts/day
   c. 10 millisieverts/day
2. What are the four typical radiographic characteristics of endodontic lesions:
   a. Mixed-density, permeative, circular and centered on the portal of exit
   b. Well-defined, mixed-density, circular and centered on the portal of exit
   c. Well-defined, uniform low density, circular and centered on the portal of exit
3. According to the AAE-AAOMR Joint Position Statement, 2015-2016:
   a. Intraoral radiographs should be exposed during the initial evaluation of the endodontic patient.
   b. Limited FOV CBCT should be exposed during the initial evaluation of the endodontic patient.
   c. Large FOV CBCT should be exposed before endodontic treatment.
4. Advantages of limited FOV CBCT:
   a. Lower radiation dose
   b. Higher spatial resolution
   c. Smaller area of responsibility
   d. All of the above
5. Presurgical mapping of  neruovascualr features, when treating large apical lesions in the premaxilla, may improve patient safety.
   a. Because the canalis sinuosus, which caries a branch of the anterior superior alevolar nerve and vessels, should be identified.
   b. Neurovascular mapping is not generally necessary.
   c. Accessory canals of at least 1.0 mm diameter are rare in the anterior maxilla.

• Answers:
  1. a
  2. c
  3. a
  4. d
  5. a