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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, permeative, circular and centered on the portal of exit
   b. Well-defined, mixed-density, circular and centered on the portal of exit
   c. Permeative, circular, and centered on the portal of exit
   d. 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 in the initial evaluation of the endodontic patient.
   b. Limited FOV CBCT should be exposed in the initial evaluation of the endodontic patient.
   c. Large FOV CBCT should be exposed before endodontic surgery to map
   important anatomic features such as vascular and neural structures.
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. The canalis sinuosus allows passage of a branch of the anterior superior alveolar
   nerve and vessels:
   a. Preoperative neurovascular mapping of lesions prior to endodontic surgery in the anterior maxilla is recommended.
   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. d
  3. a
  4. d
  5. a