California Registered Dental Assistant (RDA) Written Practice Exam

How many surfaces could a Class II restoration affect?

1. One

2. Two or three

3. Four

4. All surfaces

The correct answer is: Two or three

Class II restorations are dental procedures that involve removing decay from the side surfaces of teeth and replacing it with a filling. These surfaces are also known as proximal surfaces. A Class II restoration can affect two or three surfaces depending on the location of the decay on the tooth. For example, if the decay is only present on the distal and mesial surfaces of the tooth, then only two surfaces would be affected. If the decay is present on the distal, mesial, and occlusal surfaces, then three surfaces would be affected. Therefore, the other options are incorrect because a Class II restoration can affect either two or three surfaces, not just one, four, or all surfaces.