All-on-4 vs All-on-6: Which Full-Arch Implant Fits You

For most healthy adults missing a full arch of teeth, both All-on-4 and All-on-6 deliver fixed, same-day replacement teeth with documented five-year implant survival rates above 95%. The right choice depends on your jaw bone volume, bite force, and how much built-in redundancy you and your dentist want — not on which option is universally "better." At Carlmont Dental Care in Belmont, we walk patients through these trade-offs using a 3D scan and a candid conversation about long-term goals.

How All-on-4 and All-on-6 Actually Differ

Both treatments anchor a full-arch bridge of replacement teeth onto titanium implants surgically placed in the jaw. The number in the name refers to how many implants support that arch. All-on-4, introduced in the late 1990s, places four implants per arch, with the back two angled — often up to 30 degrees — so they engage denser bone and avoid sinus or nerve structures. This angling frequently spares patients from bone grafting. All-on-6 follows the same principle but adds two more posts, distributing chewing forces across a wider footprint.

The takeaway: same-day fixed teeth is achievable with either approach, but the number and angle of implants change how forces travel through the jaw and how much margin you have if a single implant ever needs attention.

When Four Implants Are Enough

Large clinical studies tracking thousands of patients have found that four-implant and six-implant arches perform comparably at the two-year and five-year marks when patients are selected carefully. Four implants tend to be a strong fit for:

• Patients with moderate bone loss who want to avoid lengthy grafting procedures
• Lower (mandibular) arches, where bone is denser and long-term survival is particularly strong
• People in good general health who keep up with cleanings and home care
• Patients prioritizing fewer surgical sites and a less complex procedure

Professional consensus statements support four well-distributed implants as the minimum for a one-piece full-arch fixed prosthesis. With proper planning — typically a cone-beam CT scan and a digital workup — All-on-4 has been a reliable backbone of full-arch dentistry for more than two decades.

When Six Implants Make More Sense

There are situations where added support pays off. Six implants are often preferred when:

• The upper jaw is being restored, since maxillary bone is softer and shows slightly higher implant-loss risk than the lower jaw in long-term data
• The patient has heavy bite forces, clenching, or bruxism
• The prosthesis would benefit from a wider distribution of support across a long arch
• The patient values redundancy — if one implant ever has a problem, five remain to support the bridge

Six implants can also expand options if a future restoration is ever segmented rather than built as a single bridge. The trade-offs are more surgical sites, often more bone volume needed, and a higher overall investment. Dr. Nancy Jiang and Dr. Michael Chen typically review these factors during consultation, weighing CBCT findings against your medical history and habits.

What Recovery and Maintenance Look Like

For both options, a typical timeline includes:

1. Workup: medical review, 3D imaging, and digital design of the new arch
2. Surgery day: any needed extractions, implant placement, and a fixed temporary bridge — most patients leave with teeth the same day
3. Healing: three to six months while implants integrate with bone (osseointegration)
4. Final prosthesis: a permanent zirconia or hybrid bridge screwed into the implants

Maintenance matters as much as the surgery. Most clinicians recommend professional cleanings every three to four months during the first year, then every six months long-term. Smoking, uncontrolled diabetes, and inconsistent home hygiene are the variables that most often shorten an implant's lifespan. Daily care typically includes a water flosser, interdental brushes, and an annual under-bridge inspection.

Common questions about All-on-4 vs All-on-6

Q: Will I leave the office with teeth on the same day?

Most patients receive a fixed temporary bridge the same day as surgery, regardless of whether four or six implants are placed. The permanent prosthesis is delivered after the implants have fully integrated, usually three to six months later.

Q: Does All-on-6 last longer than All-on-4?

Head-to-head studies have not shown a meaningful difference in five-year or longer-term implant survival between the two when patients are appropriately selected. Six implants offer built-in redundancy, but four implants placed with careful planning have a strong long-term track record.

Q: Will I need bone grafting?

One reason All-on-4 became popular is that its tilted posterior implants often work in jaws that would otherwise need grafting. All-on-6 sometimes requires a bit more bone volume. A cone-beam CT scan answers this for your specific case.

Q: How much does full-arch implant treatment cost?

Investment varies with the number of implants, whether extractions or grafting are needed, the prosthesis material (zirconia vs. hybrid acrylic), and any sedation. Bay Area pricing for senior clinicians and premium materials sits on the higher end, and we provide a written estimate after consultation. Carlmont Dental Care offers in-house membership plans starting at $30/month, plus 0% APR financing through CareCredit and Proceed Finance to spread treatment over time.

Q: Can I switch from a denture to All-on-4 or All-on-6?

Yes — many of our Belmont and San Mateo County patients transition from a removable denture to a fixed, implant-supported arch. The evaluation includes imaging, a periodontal review, and a discussion of bite mechanics and goals.

If you're weighing full-arch implant options, the most useful next step is a personalized evaluation. Dr. Nancy Jiang, Dr. Amanda Lee, and Dr. Michael Chen review your CBCT scan, medical history, and goals to recommend the configuration that fits your jaw — not a one-size-fits-all package. Call (650) 591-1984 or visit carlmontdentalcare.com to schedule a consultation at our Belmont office. Mandarin- and Spanish-speaking team members are available.