Restorative & Materials · single question
A mandibular removable partial denture design includes a lingual plate and a rest on the cingulum of tooth #27. What is the primary purpose of that cingulum rest?
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Correct answer: C. Support (transferring functional occlusal forces to the tooth and helping prevent the prosthesis from displacing toward the soft tissue)
Rests (occlusal, incisal, or cingulum rests) primarily provide SUPPORT — transferring functional vertical forces to the abutment tooth and preventing the removable partial denture from sinking into or displacing toward the underlying soft tissue. Retention is primarily the role of clasps, while stability against horizontal/lateral forces comes from rigid connectors, reciprocal clasp arms, and proper framework design.
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