California Registered Dental Assistant (RDA) Written Practice Exam

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Where would you find a Class I restoration in the mouth?

Occlusal surface
Buccal surface
Lingual surface
Facial surface

The correct answer is: Occlusal surface

A Class I restoration, also called an occlusal restoration, is found on the occlusal surface of a tooth, which is the chewing surface of the tooth. This type of restoration is used to repair decay or damage on the biting surface of the tooth. Options B, C, and D refer to the buccal, lingual, and facial surfaces of the tooth, which are all different from the occlusal surface. In a Class I restoration, the treatment only involves the occlusal surface and not the buccal, lingual, or facial surfaces of the tooth. Therefore, these options are incorrect.