Distinguish occlusal contacts from functional contacts.

• A. Occlusal contacts are tooth-to-tooth contacts in nonfunctional positions or during clenching; functional contacts occur during mastication and normal function.
• B. Occlusal contacts occur only during sleep.
• C. Functional contacts are contacts in nonfunctional positions; occlusal contacts occur during mastication.
• D. There is no difference between the two concepts.

Answer: (A)