National Dental Examining Board of Canada (NDEB) Practice Exam

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To minimize fractures of amalgam restorations in primary teeth, the cavity preparation should have what characteristics?

  1. Rounded axiopulpal line angles, Concave pulpal floor, Lateral walls parallel to external surface of tooth

  2. Sharp axiopulpal line angles, Convex pulpal floor, Lateral walls perpendicular to external surface of tooth

  3. Rounded axiopulpal line angles, Convex pulpal floor, Lateral walls perpendicular to external surface of tooth

  4. Sharp axiopulpal line angles, Concave pulpal floor, Lateral walls parallel to external surface of tooth

The correct answer is: Rounded axiopulpal line angles, Concave pulpal floor, Lateral walls parallel to external surface of tooth

The characteristics of the cavity preparation that can minimize fractures of amalgam restorations in primary teeth are a rounded axiopulpal line angle, a concave pulpal floor, and lateral walls that are parallel to the external surface of the tooth. Option B, C, and D have incorrect features that can increase the risk of fractures. A sharp axiopulpal line angle can create stress points and weaken the restoration. A convex pulpal floor can lead to a thinner amalgam layer, making it prone to fractures. Lateral walls that are perpendicular to the external surface of the tooth can cause overhanging edges, which can lead to fractures. Therefore, A is the correct answer.

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