INBDE (Integrated National Board Dental Examination) Practice Exam

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The general rule for the extension of the occlusal outline of the preparation in primary teeth is about ________ of the intercuspal distance?

  1. 1/2

  2. 2/3

  3. 3/4

  4. 1/4

The correct answer is: 2/3

The general rule for the extension of the occlusal outline of the preparation in primary teeth is about 2/3 of the intercuspal distance. This means that the occlusal outline should extend to about two-thirds of the distance between the highest points of the cusps or ridges on opposing teeth. Options A (1/2), C (3/4), and D (1/4) are incorrect because they do not accurately reflect the recommended extension of the occlusal outline for primary teeth. Additionally, the extensions for permanent teeth may be different, making these options incorrect for primary teeth as well. Option B (2/3) is the most accurate and commonly recommended measurement for extending the occlusal outline in primary teeth.

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