Practice Quiz

ADA NBDE National Board Dental Part II

Category - NBDE II

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What is the occlusal plane?
  1. An imaginary vertical line that divides the face when mouth is open and head is tilted
  2. An imaginary two directional (vertical and horizontal) line that divides the face into quarters
  3. An imaginary horizontal line that is formed when the mouth is open on the occlusal surfaces
  4. An imaginary horizontal line that is formed by the occlusal surfaces when the jaw is closed
Explanation
Answer: D - The occlusal plane is an imaginary horizontal line that is formed by the occlusal surfaces when the jaw is closed. Normal growth development creates non-pathologic touching of the tooth surfaces. However, harmful contact can develop from functional or parafunctional activity.
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