Maxillary Kennedy Class IV arch: teeth #4, #3, #2, #1 (right posteriors) and #12, #13 (left posteriors) are missing, so the arch is missing teeth on both distal ends. Wait — the recall lists missing 4,3,2,1, 12, 13 in the maxilla (bilateral distal-extension edentulous areas). Where would you place the indirect retainer?

Correct answer: A. On tooth #6 (canine, near the midline of the abutment)

• A. CORRECT — For a maxillary Kennedy Class I / bilateral distal-extension RPD, the indirect retainer must be placed as far as possible anterior to the fulcrum line (line connecting the most posterior direct retainers) and perpendicular to it. Tooth #6 (canine) provides an anterior stable rest position that resists lifting of the distal-extension base.
• B. Tooth #9 is a central incisor; its rest seat is less biomechanically favorable than a canine rest for indirect retention and typically shows through esthetically.
• C. Tooth #5 is a direct abutment adjacent to the distal-extension edentulous area, not the ideal indirect retainer location.
• D. Tooth #11 sits close to the fulcrum line on the left side and does not provide adequate anterior leverage.