If you need a full arch of teeth replaced — all upper or all lower — you have probably encountered two leading implant options: All-on-4 and All-on-6. Both give you a fixed, natural-looking set of teeth. Both avoid removable dentures. So what is the actual difference, and which one fits your mouth, your bone, and your budget? This Roseville guide compares them head to head.
The Core Difference, Simply Stated
- All-on-4: four implants support the full-arch bridge. The two rear implants are tilted to maximize contact with available bone.
- All-on-6: six implants support the full-arch bridge, typically placed more vertically, distributing biting forces across more anchor points.
Both are fixed (non-removable) solutions. Both can often deliver temporary teeth on surgery day. The choice between them comes down to your bone anatomy, bite forces, and clinical judgment — not to one being universally “better.”
Stability and Bite Force
More implants generally mean better load distribution. With six anchor points instead of four, All-on-6 spreads chewing forces more widely, which can be advantageous for patients with strong bites, teeth grinders, or longer bridge spans. All-on-4, meanwhile, has an excellent track record when the four implants are optimally positioned — the concept was engineered specifically to make four implants sufficient.
In practical terms: both feel solid and fixed compared with any denture. The difference shows up at the margins — heavy grinders and patients wanting maximum redundancy tend to benefit from six.
Bone Requirements
This is where the two approaches diverge most:
- All-on-4 was designed for patients with moderate bone loss. The tilted rear implants reach into denser bone areas, often avoiding grafting entirely.
- All-on-6 typically needs adequate bone volume in more locations, since six implants must each find solid anchorage. Patients with significant bone shrinkage may need grafting first to qualify.
If a 3D scan shows you have plentiful bone, either option is on the table. If bone is limited, All-on-4 may be achievable without grafting while All-on-6 would require rebuilding bone first — adding months and cost.
Surgery and Recovery
All-on-6 involves placing two additional implants, which means a somewhat longer surgery and potentially a bit more post-operative soreness. Both procedures are done under sedation with local anesthesia, both usually deliver same-day temporary teeth, and both follow the same healing timeline (3–6 months of osseointegration before the final bridge). Recovery differences are modest — expect the same soft-food phase and the same check-visit schedule either way.
Longevity and Maintenance
Both options’ implants can last decades with proper care. The practical difference: with six implants, the system has more redundancy — if one implant ever had a problem, five remain to support the bridge. With four, each implant carries more of the load, so precise planning and ongoing maintenance matter even more. Either way, the bridge itself will need monitoring and eventual maintenance over the years, and regular checkups with your prosthodontist are non-negotiable.
Cost Factors Compared
All-on-6 generally costs more than All-on-4 — two extra implants, additional components, longer surgery time, and sometimes grafting all add up. But the comparison that matters is value over decades, not just the initial number:
- All-on-4 cost factors: four implants, tilted-placement planning, temporary and final bridge, possible sedation, any extractions
- All-on-6 cost factors: everything above plus two more implants and components, potentially grafting, longer surgical time
A lower upfront cost means little if the option does not suit your bone or bite. The honest consultation compares total treatment — not just implant count — for your specific anatomy.
Which One Fits You? A Prosthodontist’s Framework
Dr. Leila Nikpour, prosthodontist at Expert Dental Group in Roseville, evaluates full-arch cases on:
- Bone volume and density from the in-house 3D CBCT scan — the decisive factor
- Bite forces — grinders and heavy chewers lean toward six
- Arch length and bridge span — longer spans benefit from more support points
- Grafting tolerance — whether you prefer to avoid grafting (favoring All-on-4) or accept it for maximum support
- Long-term maintenance outlook — your commitment to checkups and hygiene
With more than 2,500 dental implants placed and a one-year implantology fellowship in France, Dr. Nikpour plans both approaches routinely. Read more about the practice on our /about-us/ page, and see treatment details on our All-on-4 page and dental implants overview.
The Bottom Line
Neither option is the “premium” version of the other — they are different engineering solutions for different anatomies. All-on-4 excels when bone is limited and you want to avoid grafting. All-on-6 excels when bone is plentiful and you want maximum support and redundancy. The right choice is the one your 3D scan and bite analysis point to, planned by a specialist who does full-arch rehabilitation every week.
Frequently Asked Questions
Is All-on-6 always better than All-on-4?
No. “More implants” is not automatically better — what matters is whether the implant number matches your bone and bite. A well-planned All-on-4 outperforms a poorly planned All-on-6 every time.
Can I upgrade from All-on-4 to All-on-6 later?
Sometimes additional implants can be added later if bone allows, but it is not a standard “upgrade path.” It is better to choose correctly at the start through proper 3D planning.
Which option lasts longer?
Both can last decades. All-on-6 offers more redundancy if a single implant ever fails, but longevity depends far more on planning quality, your hygiene, and regular maintenance than on implant count alone.
Does All-on-6 require bone grafting?
Often, yes — six implants need solid bone in six locations. If your scan shows limited bone, grafting may be needed first, which All-on-4’s angled design frequently avoids.
Which looks more natural?
Both look natural — the visible bridge is custom-designed for your face either way. Esthetics depend on the prosthodontist’s design work, not on how many implants hide underneath.
How do I decide between them?
Get a 3D CBCT-based consultation with a prosthodontist experienced in both. At Expert Dental Group in Roseville, that consultation is free — call (916) 888-1646.
Dr. Leila Nikpour is a Roseville prosthodontist with more than 15 years of dentistry experience and 2,500+ dental implants placed. Comparing All-on-6 vs All-on-4 in Roseville? Call Expert Dental Group at (916) 888-1646 for a free consultation — 5070 Foothills Blvd, Suite 2, Roseville, CA 95747 (Mon–Fri 9–6, Sat 9–1).