Restorative & Materials · single question
In movement from protrusion BACK to maximum intercuspation (MIP), which cusp relationship exists?
Show answer and explanation
Correct answer: C. Cusp-to-fossa relationship (buccal cusps of mandibular teeth contact fossae of maxillary teeth)
- A. Edge-to-edge describes Class III or anterior open bite patterns — not the ideal MIP cusp-fossa relationship.
- B. Cusp-to-cusp is a transient contact during excursive movements or in an end-to-end occlusion — not the stable MIP relationship.
- C. Correct. In maximum intercuspation (MIP/CO), the ideal cusp-fossa relationship is: mandibular buccal cusps and mandibular lingual cusps contact in the fossae of the opposing maxillary teeth. This 'cusp-in-fossa' relationship provides bilateral stability and even load distribution.
- D. Posterior open bite describes a lack of posterior tooth contact — not the MIP relationship.
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