Kennedy Class IV Design Challenge — ORE Part 1 MCQ

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ModerateProsthodonticsKennedy Class IV Design ChallengeORE Part 1

A patient requires a cobalt-chromium removable partial denture for a Kennedy Class IV arch: one anterior edentulous area crosses the midline and posterior teeth remain bilaterally. Which feature is the principal design challenge?

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Correct answer: A — Providing retention without conspicuous anterior metalwork

Explanation lettering: E = shown as B · B = shown as D · D = shown as E

A is correct. In a Kennedy Class IV arch, the saddle is anterior and crosses the midline; components placed on anterior teeth are likely to be visible. The design challenge is therefore to obtain adequate retention, support and bracing while minimising visible clasping or metalwork and preserving appearance. Esthetic RPD literature specifically highlights Kennedy Class IV as an esthetically challenging situation and describes alternative paths of insertion to reduce visible retentive components. B is an important general requirement for all cobalt-chromium RPDs, but is not the defining Class IV issue. C is incorrect because palatal coverage may be required for support and rigidity. D is contrary to sound framework design. E relates to posterior extension and is not inherent to an anterior Class IV saddle.

Reference: Davenport JC, et al. An overview of esthetics with removable partial dentures. Journal of Esthetic and Restorative Dentistry. 2003. https://pubmed.ncbi.nlm.nih.gov/12553618/