HOSA Dental Terminology Practice

What distinguishes a three-quarter crown from a full crown?

1. It does not cover the tooth at all

2. It covers all but the facial surface of the tooth

3. It is solely a temporary fixture

4. It is made of plastic rather than metal

The correct answer is: It covers all but the facial surface of the tooth

A three-quarter crown, as the term suggests, is a type of dental restoration that covers most of the tooth but leaves one surface, typically the facial surface, uncovered. This design is specifically beneficial for preserving as much healthy tooth structure as possible while still providing strength and support to the tooth. In contrast, a full crown envelops the entire tooth, creating a uniform exterior that encapsulates every surface. The choice to use a three-quarter crown often depends on the location of the tooth, the extent of damage, and the need for aesthetic considerations. The other options do not accurately describe the characteristics of a three-quarter crown. It does indeed provide coverage for a significant part of the tooth and is not restricted to being temporary or made from specific materials like plastic. Instead, three-quarter crowns can be made from various materials including porcelain or metal, just like full crowns.