HOSA Dental Terminology Practice

What type of edge is used in tooth preparation to provide a seat for a crown?

1. Chamfer

2. Bevel

3. Shoulder

4. Undercut

The correct answer is: Bevel

The correct choice for the type of edge used in tooth preparation to provide a seat for a crown is the bevel. A bevel refers to an angle cut on the edge of a prepared tooth that allows for better adaptation and seating of the crown. It is important in crown preparation because it helps to minimize the stress at the margins when the crown is placed, ensuring a snug fit against the tooth structure. In crown procedures, bevels also promote a more aesthetic transition between the crown and the tooth, which is particularly beneficial when the crown is made of materials like porcelain that are designed to mimic the appearance of natural teeth. Properly executed bevels create a favorable parallel that aids in the retention and resistance form of the crown. Other types of edges, like the chamfer, should be noted that while they can be used in tooth preparation, they do not provide the same degree of smooth transition and aesthetic enhancement around the crown margins as a bevel does. The shoulder edge is typically used for metal crowns, providing a more defined edge. An undercut refers to a portion of a tooth that is shaped so that a material could be retained in that area, which is not utilized in typical crown preparations.