FPD stands for fixed partial denture, which is the clinical term for what most people know as a dental bridge. It’s a permanent restoration cemented onto your existing teeth (or implants) to replace one or more missing teeth. Unlike removable dentures you take out at night, an FPD stays in your mouth full-time and functions like your natural teeth.
How an FPD Works
A fixed partial denture has three basic parts. The pontic is the artificial tooth (or teeth) that fills the gap where your natural tooth used to be. The abutments are the natural teeth on either side of the gap that serve as anchors. And the retainers are the crown-like caps that fit over those abutment teeth to hold the whole structure in place. The result is a single connected unit that spans the empty space, permanently bonded with dental cement.
Most FPDs have an abutment on each end, giving the bridge two solid anchor points. This distributes chewing forces evenly across the supporting teeth and keeps the restoration stable over time.
Types of Fixed Partial Dentures
The most common type is the traditional FPD, which uses a crown on each side of the gap to hold the pontic in place. This is the standard three-unit bridge you’ll hear dentists describe most often.
- Cantilever FPD: This design anchors the pontic from one side only, leaving the other end unsupported. Because the false tooth acts like a lever during chewing, it puts significantly more stress on the supporting tooth. For that reason, it’s only used in specific situations, such as replacing a back molar or a lateral incisor (the small tooth next to your front tooth) where biting forces are lighter. The abutment tooth needs long, strong roots to handle the extra load.
- Maryland (resin-bonded) FPD: Instead of full crowns on the abutment teeth, this type uses thin metal or ceramic wings bonded to the back surfaces of the neighboring teeth. It requires less removal of healthy tooth structure, making it a more conservative option, typically used for front teeth.
- Implant-supported FPD: Rather than relying on natural teeth as anchors, this version attaches to dental implants surgically placed in the jawbone. It avoids the need to reshape healthy neighboring teeth entirely.
The rise of single-tooth implants has made conventional FPDs less common than they once were. When a patient is missing just one tooth and the neighboring teeth are healthy, many dentists now lean toward an implant to avoid altering those adjacent teeth.
Materials: Metal-Ceramic vs. All-Ceramic
FPDs are fabricated from two main categories of material. Porcelain-fused-to-metal (PFM) restorations have a metal framework underneath with a tooth-colored porcelain layer on top. They’ve been used successfully for decades and remain a cost-effective, durable choice that doesn’t require specialized lab equipment to produce.
All-ceramic FPDs use ceramic for both the inner framework and the outer layer. Zirconia, the most popular framework material in this category, has shown a 10-year survival rate of about 93.6%, which is close to what conventional metal-ceramic bridges achieve. The tradeoff is straightforward: PFM is stronger and cheaper, while all-ceramic looks more natural because there’s no metal underneath that can create a grayish line at the gum margin. As patient expectations around appearance have grown, all-ceramic bridges have become increasingly popular, especially for visible front teeth.
How Long an FPD Lasts
A large meta-analysis found that 92% of FPDs survive at least 10 years, and about 75% are still functioning at the 15-year mark. Those numbers reflect bridges that were never removed. When you also count bridges that developed technical problems serious enough to need replacement (even if they hadn’t been removed yet), the survival rate drops to roughly 87% at 10 years and 69% at 15 years.
Those are strong numbers for a dental restoration, but they do mean that roughly 1 in 4 bridges will need to be replaced or significantly repaired within 15 years. How long yours lasts depends on the health of your supporting teeth, your oral hygiene, and how much bite force the bridge endures.
What Can Go Wrong
FPD complications fall into two categories: mechanical and biological. Mechanical issues, like the porcelain chipping or the bridge coming loose from the cement, are the type most people think of first. In one long-term study, porcelain fracture or chipping occurred in about 7.6% of FPDs, while debonding (the bridge detaching from the abutment teeth) was rare at just 0.3%.
Biological complications are a bigger threat to the bridge’s long-term survival. Decay forming underneath or around the edges of the crowns, called secondary caries, was found in 8.4% of cases in the same study and has been identified as the leading reason FPDs eventually need repair or replacement. About 3.7% of abutment teeth required root canal treatment after the bridge was placed, typically because the tooth’s nerve was irritated during the original preparation or because decay reached the inner pulp over time.
Keeping an FPD Healthy
The space between the pontic and your gum tissue is the most vulnerable spot on a bridge. Food and bacteria collect there easily, and regular brushing alone can’t reach it. A floss threader or a specialized bridge floss lets you slide floss underneath the pontic and clean along the gum line. A water flosser is another effective tool for flushing debris from that space. Interproximal brushes, the tiny bottle-brush-shaped picks, can also reach areas a toothbrush misses around the abutment crowns.
Because secondary caries is the most common biological complication, keeping the margins where the crowns meet your natural tooth structure clean is essential. Regular dental checkups allow your dentist to catch early signs of decay or cement breakdown before they become serious enough to compromise the bridge.
FPD vs. Dental Implants
The biggest drawback of a traditional FPD is that it requires reshaping the two neighboring teeth to fit crowns over them. If those teeth are perfectly healthy, you’re permanently removing enamel from teeth that don’t need treatment. A single-tooth implant avoids this entirely because it stands on its own post in the jawbone.
Implants also help preserve the bone in the area where the tooth was lost. Under a bridge pontic, the jawbone in the gap gradually shrinks over time because it’s no longer stimulated by a tooth root. An implant mimics that root and keeps the bone intact.
That said, FPDs still have clear advantages in certain situations. They cost less, require no surgery, and can be completed in just a few appointments rather than the months an implant needs to heal. For patients who don’t have enough bone to support an implant (or who want to avoid the bone grafting procedures needed to build it up), a bridge is often the more practical solution. When the teeth on either side of the gap already have large fillings or crowns, using them as bridge abutments makes good clinical sense since they’ve already been restored.
Who Is a Good Candidate
An FPD works best when there are healthy, stable teeth on both sides of the gap to serve as abutments. The supporting teeth need strong roots and enough remaining structure to hold a crown reliably. Patients with well-controlled oral hygiene tend to get the longest life out of their bridges, since the main long-term risk is decay at the crown margins.
An FPD is generally not recommended when there’s no tooth behind the gap to serve as a back abutment, unless the specific situation qualifies for a cantilever design. In those cases, a removable partial denture or an implant is typically a better fit. Patients with significant gum disease or insufficient bone support around the abutment teeth may also be better served by other options, since the bridge depends entirely on those anchor teeth staying solid.