What is the difference between centric occlusion and habitual occlusion?

• A. Centric occlusion is the tooth contact pattern in maximum intercuspation; habitual occlusion is the actual functional contact pattern used by the patient.
• B. Centric occlusion is determined by patient habit; habitual is determined by the dentist.
• C. Centric occlusion is solely incisor contacts; habitual uses molars.
• D. Centric occlusion is the contact pattern during chewing; habitual occlusion is contact in centric position.

Answer: (D)

The key idea is that centric occlusion refers to a defined contact pattern in a specific jaw position, while habitual occlusion is the pattern a person actually uses in daily function.

Centric occlusion describes how the teeth contact in a stable, functional closure—often the maximum interlocking of the teeth when the jaws come together. Habitual occlusion, on the other hand, is the contact pattern that a patient habitually uses during normal function, which may differ from that defined, stable position because it reflects neuromuscular habits, comfort, and daily use.

In the given wording, centric occlusion is described as the contact pattern during chewing, and habitual occlusion as contact in the centric position. This captures the idea that habitual occlusion represents the routine, habitual closing pattern, while centric occlusion represents the functional contact pattern that occurs during activities like chewing. The other options either confuse what determines centric vs habitual, or misstate which teeth are involved or when the contacts occur.