National Dental Examining Board of Canada (NDEB) Practice Exam

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Prepare for the National Dental Examining Board of Canada (NDEB) Test. Study with flashcards and multiple choice questions, each question offers hints and detailed explanations. Achieve success in your exam!

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Proximal retention grooves in a proximal-occlusal silver amalgam restoration are most necessary when the occlusal extension is:

  1. Narrow faciolingually relative to the proximal extension

  2. Wide mesiodistally

  3. Shallow

  4. Deep

The correct answer is: Narrow faciolingually relative to the proximal extension

Proximal retention grooves in a proximal-occlusal silver amalgam restoration are important for maintaining the structural integrity and longevity of the restoration. These grooves are particularly necessary when the occlusal extension is narrow faciolingually relative to the proximal extension. This is because in such cases, there is less mechanical retention provided by the restoration and the grooves help to increase the surface area for bonding and improve retention. Therefore, the other options (B Wide mesiodistally, C: Shallow, and D: Deep) are incorrect as they do not address the specific need for proximal retention grooves in this type of restoration.

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