What is the posterior tissue at the end of the mandibular denture-bearing area that the denture base should cover? What percentage of this structure should the denture cover?

Correct answer: D. Retromolar pad — 2/3 (two-thirds)

• A. The hamular notch is a maxillary landmark, not mandibular.
• B. The buccal shelf (primary stress-bearing area) is lateral, not the posterior landmark described.
• C. 100% coverage of the retromolar pad is not the standard — overly aggressive posterior extension can cause discomfort and dislodgement.
• D. Correct. The retromolar pad is the soft triangular structure at the distal end of the mandibular alveolar ridge. The mandibular denture base should extend to cover approximately 2/3 (two-thirds) of the retromolar pad. This provides posterior border seal and stability without compromising patient comfort or muscle action.

Note: Verified clinical sources confirm the standard is 2/3 coverage. The 100% answer refers to the IMPRESSION capturing the entire retromolar pad — not that 2/3 is covered by the denture base in situ.