MedMigrant

Question 68 (part 2) · LDEK · Radiological diagnosis

Choose correct statements:

1) orthoradial rule states that the central radius should be directed perpendicularly to the tangent of the dental arch fragment and in parallel to the detector and long axis of the tooth;
2) orthoradial rule states that the central radius should be directed in parallel to the tangent of the dental arch fragment and in parallel to the detector and long axis of the tooth;
3) orthoradial rule states that the central radius should be directed perpendicularly to the tangent of the dental arch fragment and perpendicularly to the detector and long axis of the tooth;
4) oblique projection is deviation of 20 grades of the central radius in the mesial or distal direction in the horizontal plane;
5) the most important use of oblique projections is revealing the root canals located in the lingual-vestibular plane.
Correct answer is:
  1. A. 1,4,5.
  2. B. 2,4,5.
  3. C. 3,4,5.
  4. D. 3,4.
  5. E. 1,5.
Hint

Recall the paralleling geometry of the central ray relative to the arch tangent, receptor and tooth axis, then the horizontal tube shift.

The answer, the explanation and a note on every option are available once you log in. The account is free: topic tests, a mock exam, mistake review and statistics.

Create a free account Log in

More questions on Conservative dentistry