INBDE (Integrated National Board Dental Examination) Practice Exam 2025 - Free Practice Questions and Study Guide

Question: 1 / 1180

How deep in DEJ should retentive grooves be placed?

0.25mm

0.5mm

Retentive grooves should be placed 0.5mm into the DEJ (dentin-enamel junction). This is the optimal depth for providing retention and support for restorative materials such as dental amalgam or composite. Options A, C, and D are incorrect because they are either too shallow (A and D) or too deep (C) and may not provide adequate retention or support. It is important to be precise with the placement of retentive grooves in order to ensure optimal restorative outcomes.

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1mm

0.75mm

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