Complete Denture Support: Alveolar Ridges and Facial Anatomy

Complete dentures derive support, stability, and retention from oral anatomy:

Maxillary Denture

• Primary support: Residual alveolar ridge (cortical bone + mucosa)
• Secondary support: Hard palate (palatine bone), posterior palatal seal area (vibrating line)
• Peripheral seal: Labial/buccal vestibules, hamular notches
• Suction: Posterior palatal seal creates negative pressure

Mandibular Denture

• Primary support: Residual alveolar ridge (often severely resorbed)
• Secondary support: Buccal shelf (cortical bone lateral to ridge), retromolar pads
• Stability challenges: Tongue movement, floor of mouth, less surface area, no palatal suction
• Retention: Salivary adhesion, polished surface contour, neutral zone

Key Concepts

• Support: Resistance to vertical forces (tissue resilience)
• Stability: Resistance to horizontal/rotational forces (ridge form, occlusion)
• Retention: Resistance to dislodgment (saliva, border seal, anatomy)

Implant Overdentures

2–4 implants dramatically improve mandibular denture stability/retention (standard of care for edentulous mandible per McGill consensus).