Quick answer: All-on-4 is a way of replacing every tooth in an upper or lower jaw with a single fixed bridge carried by four implants. The two front implants go in straight; the two back implants are tilted so they anchor in the dense bone at the front of the jaw while still supporting the back teeth. The tilt is what makes four implants enough, and it is what lets most patients skip bone grafting and leave surgery with fixed provisional teeth the same day.
I have been treating full arches this way for most of my career, and the concept is simpler than its reputation. This article explains the mechanics, who qualifies, what surgery day and healing involve, what the long-term research shows, and what it costs at Trinity Dental Arts.
The Problem All-on-4 Solves
When a jaw has lost all of its teeth, or the remaining teeth are failing, the bone behind the front teeth is usually the first to shrink. In the upper jaw the sinus drops into the space where the back teeth were; in the lower jaw the nerve canal sits close to the surface. Traditional full-arch implant treatment answered that with six to eight implants and, frequently, months of bone grafting beforehand to rebuild the back of the jaw.
In the late 1990s the Portuguese clinician Paulo Maló, working with the implant manufacturer Nobel Biocare, formalized a different approach: place fewer implants, concentrate them in the front where the bone is good, and tilt the back pair to spread the support across the arch. The result was a fixed bridge on four implants that could usually be loaded the same day.
How Four Implants Carry a Whole Arch
Three ideas do the work:
- Tilting the back implants. The posterior implants are angled up to about 45 degrees, following the front wall of the sinus in the upper jaw or sitting in front of the nerve in the lower jaw. Tilting lets a longer implant fit in the available bone, and it moves the top of the implant farther back so the bridge has support closer to the molars. Multi-unit abutments correct the angle at the top so the bridge screws on straight.
- Spreading the load (anterior-posterior spread). The wider the distance between the front and back implants, the more of the arch they can carry without overloading. Four well-spread implants outperform six bunched in the front.
- Joining the implants together. A one-piece bridge splints the four implants, so a bite force on one tooth is shared across all four. This cross-arch stabilization is why All-on-4 can be loaded immediately when individual implants often cannot.
When the bone or the bite forces call for it, the same concept is extended to five or six implants, which is what the term All-on-X covers. The All-on-4 versus All-on-6 guide compares the two in detail.
Who Qualifies
All-on-4 is designed for people who have lost all the teeth in an arch or whose remaining teeth cannot be saved: advanced gum disease, widespread decay, failed bridges, or a denture that no longer stays put. The scan then answers three questions:
- Is there enough bone at the front of the jaw for four implants of adequate length? In the great majority of patients, yes, even when the back of the jaw is thin. Severe upper-jaw bone loss sometimes calls for extra implants, grafting or other approaches, and we discuss that if the scan shows it.
- Is the health history compatible with surgery and healing? Controlled diabetes is fine; uncontrolled diabetes is not. Smoking raises the risk of complications and bone loss around the implants. Certain bone medicines and a history of radiation to the jaw change the plan.
- Can the implants be placed with enough initial stability to load them the same day? This is decided in the operating room, not on the scan. The same-day candidates article explains the stability threshold.
Age is not a criterion. Our full-arch patients range from their forties to their eighties.
What Surgery Day Looks Like
Full-arch surgery at Trinity Dental Arts is done under IV sedation administered by the board-certified anesthesiologist on our staff. In one appointment:
- Any remaining teeth are removed.
- The bone is smoothed and shaped to create room for the bridge and a cleanable gum line.
- Four implants are placed in the positions planned on your 3D scan, usually with a surgical guide.
- Multi-unit abutments are attached, and the stability of each implant is measured.
- If the stability meets the threshold, a fixed provisional bridge — designed and made beforehand in our in-house lab — is fitted to the implants the same day and adjusted to your bite.
You leave with fixed teeth that do not come out. They are provisional: strong enough for a soft diet while the implants heal, not yet the final zirconia bridge. The Teeth in a Day article covers the difference in detail.
Healing and the Final Teeth
Over the next three to six months the bone integrates with the implants. You eat a soft diet in the early weeks, clean under the provisional bridge as we show you, and come in for checks. When integration is confirmed, we scan the implants, design the final bridge, try it in, and deliver it. The practice's standard final prosthesis is zirconia: a milled ceramic arch with no acrylic to stain or wear. Because the lab is in the building, the shade, the shape of the teeth and the way they meet your lip can be adjusted at the try-in rather than negotiated by mail.
What the Long-Term Research Shows
All-on-4 has more than two decades of follow-up. The longest series from the clinic that developed the concept followed 471 patients with 1,884 implants supporting lower-jaw All-on-4 bridges for 10 to 18 years and reported a cumulative prosthesis survival of 98.8% and implant survival of 93% (Maló et al., 2019). Two findings in that paper matter for your planning. First, smoking and previous biological complications were associated with more bone loss around the implants, which is why we talk about smoking so directly. Second, mechanical complications — chipped teeth, loosened screws, fractures of the provisional — occurred in about a third of patients over the long follow-up, and were less common with stronger prosthetic materials. In plain terms: the implants are highly predictable, and the bridge on top is a mechanical device that needs maintenance.
Living With All-on-4
- Cleaning. Brush the bridge like teeth and clean under it daily with a water flosser or floss threaders. Food and plaque that sit under a fixed bridge are the main cause of gum inflammation around the implants.
- Maintenance visits. Every three to six months we clean around the implants, check the screws and inspect the bite. Periodically the bridge is removed for a thorough cleaning.
- Night guard. If you clench or grind, you wear one. Zirconia is hard, but the implants underneath feel every ounce of overnight force.
- Expect some repairs over a lifetime. A chipped tooth or a worn component is a maintenance event, not a failure, and an in-house lab turns most of them around quickly.
What All-on-4 Costs at Trinity Dental Arts
Fixed full-arch teeth on four implants start from $25,000 per arch. That published price includes the four implants, extraction of the remaining teeth in that arch, sedation, the same-day provisional bridge, the final zirconia bridge, all lab work and the diagnostic visit. Bone grafts and sinus lifts are quoted on their own line only when your scan shows you need them, and additional implants beyond four are quoted in writing. The full-arch pricing table shows the tiers side by side, and the implant cost page explains what moves the number.
All-on-4 Compared With the Alternatives
- All-on-6. Two more implants for extra support when bone and bite forces warrant it. Compared on the All-on-4 vs. All-on-6 page.
- Implant-retained overdenture (snap-in denture). Removable, usually on two to four implants, less expensive up front, but still a denture you take out at night. The implant dentures article explains why we favor fixed teeth.
- Conventional dentures. No surgery, but no bone preservation and a lifetime of adhesive and relines. Compared on the All-on-4 vs. dentures page.
- Individual implants for every tooth. Rarely justified; far more surgery and cost for a result that is not more stable than a splinted arch.
Frequently Asked Questions
Why are the back implants tilted in All-on-4?
Tilting the posterior implants up to about 45 degrees lets them anchor in the denser bone at the front of the jaw while avoiding the sinus (upper) and the nerve (lower). It allows a longer implant, spreads the support farther back under the bridge, and usually avoids bone grafting.
Is All-on-4 permanent?
The bridge is fixed in place and is removed only by the dentist for maintenance. The implants are designed to last decades; long-term studies report implant survival around 93% at 10 to 18 years. The bridge itself is a mechanical restoration that needs periodic maintenance and occasional repair.
How long does All-on-4 take from start to finish?
One surgical day for extractions, implant placement and, when stability allows, fixed provisional teeth; then three to six months of healing; then the final zirconia bridge. Most patients have fixed teeth throughout.
What does All-on-4 cost?
At Trinity Dental Arts fixed full-arch teeth on four implants start from $25,000 per arch, including extractions, sedation, the same-day provisional bridge and the final zirconia bridge. Grafting and additional implants are quoted separately when the scan calls for them.
Can I get All-on-4 if I have bone loss?
Usually yes. The tilted-implant design was created specifically to use the bone at the front of the jaw and avoid grafting. Severe upper-jaw bone loss may call for additional implants or other approaches, which the 3D scan will show.
Dr. Xhoana Gjelaj, DMD, MAGD, DABOI/ID, DICOI, FAAID is a board-certified implantologist and the owner of Trinity Dental Arts in Trinity, FL, home of the FiXed New Teeth full-arch program. Reserve a $300 Signature Consultation, a 90-minute clinical visit with a 3D CBCT scan and a written plan, credited toward treatment begun within 30 days, or call (727) 228-6846.