In a maxillary complete denture, which area is the PRIMARY stress-bearing area?

Correct answer: C. The horizontal portion of the hard palate

• A. The incisive papilla contains the nasopalatine neurovascular bundle and must be relieved to avoid pain and paresthesia.
• B. The tuberosity contributes to retention and stability but is not the primary load-bearing surface.
• C. CORRECT. The PRIMARY stress-bearing areas of the maxilla are the HORIZONTAL (posterolateral) portion of the hard palate and the posterior residual ridge — regions with dense cortical bone covered by firmly attached, keratinized mucosa capable of tolerating occlusal load. Secondary stress-bearing areas are the rugae and the residual ridge slopes. Relief areas (which must NOT bear load) are the mid-palatal raphe, the incisive papilla, and any torus.
• D. The mid-palatal suture/raphe is a RELIEF area — the mucosa there is thin and non-resilient over the suture, and loading it causes a rocking denture, soreness, and ulceration.

Note: Compare the mandible: primary stress-bearing = buccal shelf and the pear-shaped pad. Relief = mylohyoid ridge, mental foramen, genial tubercles.