INBDE (Integrated National Board Dental Examination) Practice Exam

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The mandible acts as a class ____ lever.

  1. 1

  2. 2

  3. 3

  4. 4

The correct answer is: 3

The mandible is a class III lever, as it has a fulcrum (jaw joint) between the effort (muscle) and load (teeth). Option A is incorrect because class I levers have the fulcrum in between the effort and load. Option B is also incorrect because class II levers have the load in between the fulcrum and effort. Option D is incorrect because class IV levers have the effort in between the fulcrum and load. Therefore, the correct answer is C, class III lever.

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