INBDE (Integrated National Board Dental Examination) Practice Exam

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How much MD width does an occlusal rest need to be?

  1. 1/4

  2. 1/3

  3. 1/2

  4. 2/3

The correct answer is: 1/3

An occlusal rest needs to be 1/3 of the MD width of the tooth. The incorrect options of 1/4, 1/2 and 2/3 are either too narrow or too wide for proper support and stability of the occlusal rest. Therefore, 1/3 is the optimal width for an occlusal rest.

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