Implant-Supported Dentures

What Are Implant-Supported Dentures?

An implant-supported denture is a removable prosthesis that snaps onto or clips over dental implants embedded in the jawbone. Unlike a conventional denture that rests on the gum tissue and relies on suction or adhesive for retention, an implant-supported denture locks into place with mechanical attachments. The result is a denture that stays put during eating, speaking, and laughing -- yet can still be removed by the patient for cleaning.

This approach is most commonly used for the lower jaw, where conventional dentures tend to perform worst. The lower ridge is narrow, the tongue constantly pushes against the denture, and there is no broad palatal surface to create suction. Even a well-made lower denture can shift and float during meals. Two to four implants in the lower jaw transform a frustrating appliance into one that functions with real confidence.

Upper implant-supported dentures are also an option, particularly for patients who cannot tolerate the palatal coverage of a conventional upper denture or who have a strong gag reflex. With implant retention, the palate can be left open, which many patients find more comfortable and which allows better taste perception.

Bar-Retained vs. Ball-Retained (Locator) Systems

The two most common attachment systems are bar-retained and ball-retained (also called locator-retained) dentures. Each has distinct characteristics, and the choice depends on anatomy, the number of implants placed, and patient preference.

Bar-Retained Dentures

A thin metal bar is custom-fabricated to follow the curve of the jaw, connecting two or more implants. The denture contains clips or riders that fit over the bar and hold the prosthesis firmly in place. Bar retention distributes the load across all the connected implants simultaneously, which can be advantageous when implants are not ideally parallel or when maximum retention is needed.

The bar itself is milled from titanium or a cobalt-chromium alloy using CAD/CAM technology, ensuring a precise passive fit over the implants. Because the bar adds a layer of structure between the implants and the denture, the prosthesis tends to be very stable with minimal rocking.

Ball-Retained (Locator) Dentures

Each implant receives an individual abutment -- a small post that protrudes above the gum line. The denture contains a corresponding nylon insert that snaps over the abutment. Locator attachments are the most widely used version of this design, featuring a low-profile abutment and color-coded retention inserts that can be swapped out to increase or decrease how tightly the denture snaps on.

This system is simpler to maintain than a bar system. The retention inserts wear over time and are replaced during routine appointments -- a quick, inexpensive procedure. Locator-retained dentures also tend to be less bulky than bar-retained versions, since there is no connecting bar taking up space beneath the prosthesis.

Benefits Over Traditional Dentures

• Stability. The denture does not shift, rock, or pop out during eating or conversation. Foods that are difficult or impossible with a conventional denture -- apples, corn on the cob, steak -- become manageable again.
• Bone preservation. Implants transfer chewing forces into the jawbone, stimulating it in a way that a tissue-borne denture cannot. This slows the bone resorption that occurs naturally after teeth are lost and helps maintain the shape of the jaw over time.
• Reduced tissue irritation. Because the implants carry a significant portion of the chewing load, the gum tissue bears less pressure. Patients who have chronic sore spots with conventional dentures often find that implant support eliminates the problem entirely.
• No adhesive. Denture adhesive becomes unnecessary when implant attachments provide the retention. This simplifies the daily routine and eliminates the taste and texture issues that adhesive can introduce.
• Open palate (upper dentures). When implants retain an upper denture, the acrylic can be trimmed away from the palate. This improves comfort, allows normal taste sensation, and reduces the gagging that some patients experience with full palatal coverage.

The Treatment Process

Treatment unfolds in two main phases: the surgical phase and the prosthetic phase.

During the surgical phase, the implants are placed into the jawbone by an oral surgeon or periodontist. If adequate bone is present, this is a straightforward outpatient procedure performed under local anesthesia with sedation if desired. The implants then require a healing period -- typically three to six months -- during which they integrate with the surrounding bone in a process called osseointegration. During this time, the patient wears their existing or a temporary denture.

Once the implants have integrated, the prosthetic phase begins. If a two-stage surgical protocol was used, the surgeon uncovers the implants first. Dr. Rasmussen then attaches the abutments or bar, takes impressions, and fabricates the final implant-supported denture. The denture is tried in and adjusted to achieve proper fit, bite, and aesthetics before the patient takes it home.

For patients who already wear a denture they are satisfied with (aside from its stability), it is sometimes possible to retrofit the existing denture with implant attachments rather than fabricating an entirely new prosthesis. Dr. Rasmussen evaluates this on a case-by-case basis.

Candidacy and Bone Requirements

Implant-supported dentures require sufficient bone volume and density to anchor the implants. A cone-beam CT scan (CBCT) is taken during the planning phase to evaluate the available bone in three dimensions. This scan reveals the height, width, and density of the jawbone, as well as the location of anatomical structures like the inferior alveolar nerve and the maxillary sinuses that must be avoided during implant placement.

Patients who have worn conventional dentures for many years often have significant ridge resorption, particularly in the lower jaw. In some cases, bone grafting can rebuild the ridge to accommodate implants. In others, shorter or narrower implants can be placed in the available bone without grafting. Dr. Rasmussen works with the surgeon to determine the most predictable approach for each patient.

General health also plays a role. Uncontrolled diabetes, heavy smoking, and certain medications that affect bone metabolism can reduce implant success rates. These factors are discussed during the consultation so patients can make informed decisions.

Already Wearing Dentures?

If you currently wear a conventional denture and are tired of the movement, the adhesive, or the dietary limitations, implant support may be the upgrade you have been looking for. Many patients describe the difference as transformative -- the denture simply stays in place, and they stop thinking about it during the day.

Schedule a consultation with Dr. Rasmussen to find out whether your anatomy and health history make you a candidate for implant-supported dentures. The evaluation includes a clinical exam, the CT scan, and a straightforward conversation about what is realistic for your situation.