Surveyed Crown Purpose — ORE Part 1 MCQ

Instant feedback + full explanation. One question, done properly.

HardProsthodonticsSurveyed Crown PurposeORE Part 1

A cobalt-chromium removable partial denture has been planned for a patient whose premolar abutment requires a full-coverage crown. What is the principal purpose of making this a surveyed crown?

Educational content. Not a substitute for clinical judgement or local policy.

Reveal the answer and explanation

Correct answer: D — To provide guide planes and retentive clasp contours

**A is correct.** A surveyed crown is contoured in relation to the planned path of insertion of the cobalt-chromium framework. Its key purpose is to provide parallel guide-plane surfaces and appropriately positioned contours for the clasp assembly, so that the denture seats along a controlled path and obtains retention from the intended undercut. The need to design abutment-crown contours for the direct retainer and the RPD path of placement/removal is the defining feature of a surveyed crown. Aesthetic improvement and caries protection may be benefits of a full crown, but they are not the reason for surveying it. Increasing axial height alone does not create the required guide planes or retentive contour. Occlusal alteration may be needed for clearance or a rest seat, but it is not the principal purpose.

Reference: Burns DR, Unger JW. The construction of crowns for removable partial denture abutment teeth. Quintessence International. 1994;25(7):471-475. https://pubmed.ncbi.nlm.nih.gov/7991768/