HOSA Dental Terminology Practice

What is an undercut in dental terminology?

1. A removal of tooth structure near the gingival edge

2. An additional tooth preparation technique

3. A measurement of tooth height

4. A restoration method for cavities

The correct answer is: A removal of tooth structure near the gingival edge

An undercut in dental terminology refers to a specific condition in which there is a removal of tooth structure near the gingival edge. This can create an area where the tooth structure is lower than the margins of the cavity preparation, leading to a retaining feature that helps secure restorative materials in place. This characteristic is particularly important for devices like crowns or fillings, as it enhances their retention by preventing them from dislodging. The other options do not accurately describe an undercut. The reference to an additional tooth preparation technique does not inherently describe what an undercut is, as it primarily pertains to the method of achieving a secure fit for restorations. Similarly, measuring tooth height or discussing restoration methods for cavities does not capture the essence of what an undercut represents in dental practice. An undercut is not merely a technique or a method; it has a distinct anatomical and functional implication related to the structure of the tooth and the dynamics of restorative dentistry.