Prosthodontics & Occlusion · single question
A lower RPD has a lingual plate major connector with a cingulum rest on tooth #27. What is the PRIMARY purpose of the cingulum rest?
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Correct answer: C. Support (resisting vertical displacement toward tissues)
A rest (including a cingulum rest) provides SUPPORT — it resists vertical displacement of the RPD toward the soft tissue (occlusal/masticatory forces). The rest transmits occlusal forces to the supporting teeth through the rest seat. Retention resists removal from the mouth. Stability resists horizontal (lateral) movement. The rest is the component that bears the vertical load and keeps the RPD from sinking.
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