All-on-4 and All-on-6 are both full-arch implant solutions that replace an entire row of teeth — top or bottom — on a fixed bridge anchored by either four or six implants. Both are mature, well-documented protocols with strong long-term data. Both are routinely offered by Istanbul clinics at roughly a quarter of UK private pricing. The question patients actually want answered is not 'which is newer or more advanced' but 'which is right for me?' This guide walks through the genuine clinical, financial and lifestyle factors that should drive the choice — based on what we see in our own caseload at Ultra Diş in Pendik, Istanbul.
What the Two Procedures Actually Are
All-on-4 is the original full-arch immediate-load protocol developed by Paulo Maló in the 1990s. Four implants per arch — two placed conventionally in the anterior region, two tilted at 30–45° in the posterior to avoid the maxillary sinus and inferior alveolar nerve. A full prosthetic arch of 10–14 teeth is screwed onto these four anchors.
All-on-6 distributes the same kind of prosthesis across six implants per arch — typically four anterior and two posterior, all placed at more conventional angles. The bridge can extend further posteriorly because the load is shared, and posterior implants do not need to be tilted as aggressively.
Both protocols can deliver a fixed set of teeth on the same day as surgery — what surgeons call 'immediate function'. Both use the same implant brands (Straumann BLT, Nobel Biocare, MIS) and the same prosthetic materials (zirconia, hybrid acrylic over titanium framework, monolithic zirconia).
The Maló Clinic All-on-4 protocol has 25+ years of published outcomes data. All-on-6 (more correctly called 'fixed full-arch on six implants') has roughly the same body of clinical evidence and is the standard alternative when biomechanics favour load distribution.
What Differs in Materials, Time and Planning
All-on-4 single arch at Ultra Diş: four implant bodies (MIS at the more economical end of implant brand choice, Straumann at the premium end depending on the case), with a temporary acrylic-titanium bridge fitted at surgery and a monolithic zirconia final bridge fitted on the return trip.
All-on-6 single arch: two additional implant bodies, an extra 45–60 minutes of surgical time, more complex CBCT-guided surgical planning, and a marginally more complex prosthetic design to distribute load across the extra anchors.
Full-mouth cases (both arches) roughly double the implant count and surgical time regardless of which protocol is chosen.
What is included in our package: CBCT 3D scan, blood tests, surgical placement, immediate temporary bridge, all check-ins during the trip, return-trip final zirconia bridge fitting 3–4 months later, and a night guard. Hotel, transfers and meals are covered for the duration of treatment days.
Additional clinical needs identified during assessment — such as extractions, bone grafting, sinus lift or IV sedation — are itemised individually in your written treatment plan after the CBCT scan, rather than bundled into a single headline figure.
When All-on-6 Is Genuinely Worth the Extra Implants
Heavy bruxism — patients with documented or suspected nighttime grinding generate occlusal forces 2–3× higher than normal. Distributing those forces across six anchors materially reduces peri-implant bone stress and screw loosening rates over a 10-year horizon.
Compromised posterior bone — patients with significant posterior alveolar bone loss who do not want sinus lift surgery may be better served by All-on-6 with conventional posterior implants rather than the more aggressive 45° tilted posterior of All-on-4.
Severely flat or atrophic maxilla — the upper jaw can sometimes provide better fixation for six smaller-diameter implants distributed across the anterior arch than four longer implants tilted posteriorly.
Long bridges with cantilever concerns — if you need a prosthesis extending to second molars, the additional posterior anchors of All-on-6 reduce cantilever-induced stress on anterior implants. All-on-4 is usually designed with shorter cantilever (to first molar at most).
Patient preference for redundancy — if a single All-on-6 implant fails over 10 years, the bridge usually remains stable on the remaining five. If an All-on-4 implant fails, the bridge is structurally compromised. Some patients value this redundancy and accept the cost premium accordingly.
When All-on-4 Is the Right Call
Adequate native bone with normal occlusal forces — most patients fall into this category. Tilted posterior implants in All-on-4 use existing bone rather than requiring sinus lift, which means a shorter overall treatment time and lower total cost.
Cases with strong clinical fundamentals and no bruxism or bone compromise — the two extra implants of All-on-6 add limited additional benefit here, and that clinical margin can instead go toward a premium implant brand, premium zirconia, or improved prosthetic quality.
Patients who want immediate-load aesthetics from day one — All-on-4 was specifically designed for same-day teeth, and the surgical and prosthetic protocol is built around that timeline. All-on-6 can also deliver immediate function but slightly more often benefits from a delayed-load protocol.
Severely atrophic posterior maxilla where sinus lift is contraindicated — the zygomatic All-on-4 variant uses long implants engaging the zygoma (cheekbone), and is sometimes the only option without grafting.
Older patients prioritising shorter total surgical time — All-on-4 surgical placement averages 90–120 minutes per arch under local anaesthetic. All-on-6 averages 130–170 minutes. The difference matters for medically complex patients.
Bone, CBCT and Surgical Planning
Every full-arch case starts with a CBCT (cone-beam computed tomography) 3D scan, taken on day 1 in Istanbul. This shows bone height, density, sinus position, nerve canals, and any pathology. Treatment planning software then virtually places each implant at the optimum angle and depth.
Bone quality matters more than bone quantity in many cases. D1 (very dense cortical bone, often lower anterior mandible) provides excellent primary stability; D4 (soft trabecular bone, often posterior maxilla) requires longer healing or more implants to compensate.
Modern guided-surgery protocols transfer the CBCT-planned implant positions to a 3D-printed surgical guide that fits over your gums during surgery. This makes implant placement millimetre-accurate and matches what the prosthetic team has designed for the bridge.
Bone grafting can convert marginal cases into good All-on-4 or All-on-6 candidates. Sinus lift adds 3–6 months to the timeline but is often the difference between a successful long-term outcome and ongoing problems. We discuss grafting candidly during the initial consultation rather than proceeding 'just in time'.
The Treatment Timeline From the UK
Trip 1 — Surgery and Immediate Temporary (5–7 days). Day 1: arrival, consultation, CBCT, treatment planning. Day 2: any extractions, implant placement under local anaesthetic with optional IV sedation. Day 3–4: temporary fixed bridge fitted; you leave with a full set of teeth. Day 5–7: post-op checks, oral hygiene briefing, return flight.
Healing period — 3 to 4 months at home. Osseointegration progresses invisibly. You eat normally with the temporary bridge (softer foods initially), maintain meticulous hygiene, and check in by WhatsApp at week 1, 1 month and 3 months.
Trip 2 — Final Zirconia Bridge (3 days). Day 1: integration check, impressions or intraoral scan. Day 2: laboratory fabricates the final monolithic zirconia bridge. Day 3: try-in, bite adjustment, final cementation/screw-retention. Photographs and discharge with full aftercare instructions.
Total elapsed time from initial consultation to final bridge: typically 4–5 months. Total time off work: 2 weeks (split across two trips), most of which is travel and elective recovery rather than incapacity.
Long-term Survival and Maintenance
Published 10-year implant survival rates for both All-on-4 and All-on-6 sit above 94% for healthy patients. Bruxists and uncontrolled diabetics drop to 88–92%. Heavy smokers drop further to 80–85%. These numbers come from prospective cohort studies and are independent of the implant count itself.
The prosthetic bridge has a slightly shorter horizon — 10–15 years for monolithic zirconia bridges, 7–10 years for hybrid acrylic over titanium. Most failures are wear-related rather than catastrophic, and the bridge can be replaced without removing the implants.
Annual maintenance — professional hygiene every 6 months, a full review with peri-apical X-rays at year 1 and then every 2 years. We run online reviews for international patients and coordinate with UK partner dentists for in-person hygiene appointments.
Night guards are mandatory for bruxists. We provide one at the time of final bridge fitting. Replacement is needed every 18–36 months depending on grinding intensity.
How We Recommend Choosing — Honestly
Send your existing X-rays or panoramic to our oral surgeon via WhatsApp or the contact form. We respond within 2 hours with an honest first-look assessment.
If your CBCT shows adequate posterior bone, normal occlusion, no bruxism and no medical complications: All-on-4 is the cost-effective right answer. Adding two implants buys you statistical safety but little real-world difference.
If you have documented bruxism, posterior bone loss, weaker bone quality, or simply want the redundancy of six anchors: All-on-6 is worth the two extra implants for the load distribution and structural redundancy they provide.
If you fall in between — and many patients do — we discuss the trade-off openly. There is no single right answer for borderline cases; it is genuinely a patient-preference call once the clinical fundamentals are established.
What we do not do: default-recommend the higher-revenue option. The 10-year evidence base is clear that correctly indicated All-on-4 outperforms incorrectly indicated All-on-6 every time. The implant count is a tool, not a target.
Frequently Asked Questions
Is All-on-6 always better than All-on-4?
Why do some clinics push All-on-6 over All-on-4?
What's the practical difference between All-on-4 and All-on-6 during treatment?
Do I need enough bone for All-on-6?
How long do All-on-4 and All-on-6 last?
Can I have All-on-4 on top and All-on-6 on bottom (or vice versa)?
What if one implant fails after placement?
Send Your X-rays — Get an Honest Recommendation
Our oral surgeon will review your CBCT or panoramic personally and tell you which protocol — All-on-4 or All-on-6 — actually fits your case. Written quote within 2 hours, no deposit required.