skip to main content

RPD Clasp Selection — NDEB AFK MCQ

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

ModerateProsthodonticsRPD Clasp SelectionNDEB AFK

In a removable partial denture (RPD) design, which type of clasp provides the best retention on a tooth with a low survey line (located in the cervical third)?

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

Reveal the answer and explanation

Correct answer: C — I-bar clasp

An I-bar (Roach clasp) approaches the undercut from a gingival direction and engages the retentive undercut at the cervical third of the tooth. It is indicated when the survey line (height of contour) is located in the cervical third. Circumferential clasps approach from an occlusal direction and are better suited when the undercut is in the middle third. The I-bar provides excellent aesthetics as it contacts less tooth surface.

Reference: Carr – McCracken's Removable Partial Prosthodontics, 13th ed., 2015