What Are All-on-4 Dental Implants?

All-on-4 dental implants are a revolutionary full-arch restoration technique that replaces an entire row of missing or failing teeth using just four strategically placed All-on-4 dental implants. Unlike traditional implant methods that may require six to eight implants per arch, the All-on-4 protocol achieves full-arch stability with fewer implants, often eliminating the need for bone grafting — making it a faster, more accessible solution for patients with significant tooth loss.

At Lake Norman Oral & Facial Surgery, Dr. Raymond J. Haigney II — a double board-certified oral and maxillofacial surgeon — has helped hundreds of patients regain full dental function and confidence through the All-on-4 procedure. Below is a comprehensive look at how the technique works, who it's for, and what to expect.

How the All-on-4 Technique Works

The All-on-4 concept was developed by Dr. Paulo Maló in the late 1990s and has since become one of the most studied and validated implant protocols in modern dentistry. The technique uses four titanium implants per arch:

Two anterior implants — placed vertically in the front of the jaw where bone density is naturally highest
Two posterior implants — tilted at 30–45 degree angles toward the back of the mouth, maximizing contact with available bone and avoiding anatomical structures (the sinus cavities in the upper jaw, the inferior alveolar nerve in the lower jaw)

The angled posterior implants achieve a wider "spread" across the arch, creating a stable foundation for a fixed prosthetic bridge — typically 10–14 teeth — that is attached the same day as surgery in many cases.

Who Is a Candidate?

All-on-4 implants are designed for patients who:

Are missing all teeth in one or both arches (edentulous)
Have failing dentition — teeth so compromised by decay, fractures, or periodontal disease that extraction is the best path forward
Wear traditional dentures and want a permanent, fixed alternative that doesn't slip, click, or require adhesive
Have moderate bone loss — the tilted implant design often eliminates the need for sinus lifts or bone grafts that would otherwise delay treatment by 6–9 months
Want same-day results — most All-on-4 patients leave with a functional temporary prosthesis on the day of surgery

Patients must be in stable general health and have controlled chronic conditions (diabetes, hypertension). Heavy smokers and patients with uncontrolled periodontal disease may need to address those factors first.

The All-on-4 Procedure: What to Expect

The treatment timeline typically spans 3–6 months from initial consultation to final prosthesis delivery:

Consultation & Planning

A 3D cone-beam CT scan (CBCT) maps your jaw anatomy, bone volume, nerve locations, and sinus position. Dr. Haigney uses this data to plan precise implant positions using digital surgical planning software. In many cases, a surgical guide is 3D-printed to ensure millimeter-level accuracy during placement.

Surgery Day

The procedure is performed under IV sedation or general anesthesia. Any remaining teeth are extracted, the four implants are placed, and a temporary fixed bridge (often acrylic) is secured to the implants the same day. Total surgical time: approximately 2–3 hours per arch.

Healing Period (3–6 Months)

During osseointegration — the process by which bone fuses to the titanium implant surfaces — patients wear the temporary bridge and follow a modified soft diet. Regular check-ups monitor healing progress.

Final Prosthesis

Once integration is confirmed, impressions are taken for the final prosthesis — typically a zirconia or acrylic hybrid bridge. This permanent restoration is designed for aesthetics, strength, and long-term durability (15–25+ years with proper care).

Advantages Over Traditional Dentures

Fixed, non-removable — no adhesives, no slipping, no overnight soaking
Bone preservation — implants stimulate the jawbone and prevent the continued bone resorption that occurs under traditional dentures
Full chewing power — patients can eat steak, apples, corn on the cob — foods impossible with conventional dentures
Natural appearance — the prosthesis includes realistic gum tissue contours and individually characterized teeth
Confidence — no fear of dentures dislodging during meals, conversation, or laughter

Risks & Considerations

As with any surgical procedure, All-on-4 carries some risks: implant failure (approximately 2–5% per implant), infection, nerve irritation, or prosthesis fracture during the healing phase. Smoking significantly increases failure rates. Proper patient selection, experienced surgical technique, and adherence to post-operative instructions minimize these risks.

Cost & Investment

All-on-4 treatment typically ranges from $20,000–$30,000 per arch depending on prosthesis material (acrylic hybrid vs. zirconia), sedation type, and case complexity. While the upfront cost exceeds traditional dentures, the long-term value — factoring in denture replacements, adhesives, relines, and the intangible cost of compromised quality of life — often makes All-on-4 the more economical choice over a 15–20 year horizon.

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