Full Denture

A full denture (also called a complete denture) is a removable prosthetic that replaces all of the teeth in an upper or lower dental arch. Full dentures rest directly on the edentulous (toothless) ridge and, in the case of upper dentures, the palate.

How Full Dentures Stay in Place

Unlike partial dentures that clasp onto natural teeth, full dentures rely on:

• Suction — An upper denture creates a seal against the palate through intimate contact between the acrylic and the tissue. This suction effect (sometimes called the “peripheral seal”) is the primary retention mechanism for maxillary dentures.
• Tissue adaptation — The denture base conforms closely to the ridge contours, creating friction that resists displacement.
• Muscle control — Over time, patients learn to use their cheek, lip, and tongue muscles to stabilize the denture during function.
• Adhesive — Many patients use denture adhesive for additional security, particularly for lower dentures where suction is minimal.

Lower dentures are inherently less retentive than uppers because there’s no palate to create suction. The tongue and floor of the mouth limit the denture’s extension.

Types of Full Dentures

Conventional Dentures

Fabricated after all teeth have been extracted and the tissues have healed — typically 8 to 12 weeks post-extraction. This healing period allows the ridge to stabilize, resulting in a better-fitting prosthetic.

Immediate Dentures

Fabricated in advance and inserted immediately after extractions, so the patient never goes without teeth. The trade-off is that immediate dentures require relining after the ridge heals and remodels, typically within the first year.

The Fabrication Process

A full denture typically requires several appointments and lab stages:

1. Primary impressions — Preliminary impressions in stock trays to create study models
2. Custom tray impressions — Final impressions in custom-made trays for precise tissue detail
3. Bite registration — Wax rims used to establish vertical dimension and centric relation
4. Tooth selection — Choosing mold, shade, and material for the prosthetic teeth
5. Wax try-in — A trial setup in wax allows the dentist and patient to verify esthetics, bite, and fit before final processing
6. Processing — The wax is replaced with heat-cured acrylic, and the denture is finished and polished
7. Delivery and adjustment — The denture is seated, and adjustments are made as needed

Longevity

With proper care, a well-made denture can last 5–10 years before needing replacement. However, the denture may need relining every 2–3 years to compensate for ongoing ridge resorption.