Full-Arch Implant Rehabilitation
All-on-4 and All-on-6
Implant Treatment
Complete rehabilitation of the upper or lower jaw using four or six strategically placed implants — performed in accredited Istanbul partner clinics under the clinical oversight of our Chief Medical Advisor.
Understanding the Treatment
What All-on-4 and All-on-6 Actually Are
These are not two separate products. They are two clinical configurations of the same underlying approach — full-arch rehabilitation supported by a small, precise number of implants.
The term All-on-4 was introduced in 1998 by Dr. Paulo Maló, describing a protocol in which a full fixed prosthesis is supported by four implants: two placed vertically in the anterior region and two tilted at thirty to forty-five degrees in the posterior. The tilting was not cosmetic. It was designed to engage dense cortical bone, avoid the maxillary sinus and inferior alveolar nerve, and reduce the need for bone grafting in patients who had lost significant posterior bone height.
All-on-6 follows the same principle but adds two additional implants between the anterior and posterior positions. This provides broader load distribution, shorter cantilever segments in the final prosthesis, and — in many upper-jaw cases — improved long-term biomechanics when the opposing arch is natural dentition or a similarly stiff prosthesis.
In both protocols, the goal is the same: a fixed, stable, functional set of teeth supported by titanium implants that integrate with the jawbone. The difference is how many points of support that arch needs to perform well for decades, not months.
The Clinical Decision
How We Determine Whether You Need Four, Five, or Six
This is the question that separates careful clinical practice from menu-based dentistry. The answer is not a preference. It is a reading of your specific anatomy, habits, and opposing arch.
When a patient's cone-beam computed tomography scan reaches our clinical team, Dr. Sayıner reviews a set of objective variables before any recommendation is made. These include the volume and density of residual bone in both the anterior and posterior segments, the position of the maxillary sinus and mandibular canal, the quality of the opposing dentition, evidence of bruxism or other parafunctional habits, and the arch in question — upper or lower.
In the lower jaw, where bone quality is typically denser and cortical support is abundant, four implants are often biomechanically sufficient. In the upper jaw, where bone density is lower and sinus anatomy constrains posterior placement, six implants are frequently the more defensible choice. This is not a universal rule — the literature contains long-term studies supporting both configurations in both arches — but it reflects the pattern of decisions we see when cases are reviewed individually rather than sold as fixed packages.
Patients who present with severe bruxism, a heavily restored opposing arch, or a history of prosthetic fracture are candidates for six implants almost without exception. Patients with excellent bone volume, a stable opposing arch, and no parafunctional concerns may be well served by four. The wrong answer is deciding before the scan is read.
Candidacy
Who These Treatments Are Designed For
Full-arch implant rehabilitation is appropriate for adults who are missing most or all of the teeth in at least one jaw, or who retain teeth that are no longer restorable due to advanced periodontal disease, recurrent failure of prior restorations, or structural compromise. It is also appropriate for patients with long-standing removable dentures who want fixed, non-removable teeth for reasons of function, comfort, or preference.
Candidates typically share a set of conditions: they are in reasonable general health, they have adequate bone volume to support implants (or are willing to undergo adjunctive procedures such as bone augmentation or sinus lifting when indicated), they do not smoke heavily, and they are able to commit to the two-visit clinical timeline and follow-up protocol that full-arch treatment requires.
We pay particular attention to patients who come to us having already received consultations elsewhere. Many arrive with treatment plans that understate complexity, overstate outcomes, or compress timelines beyond what is biologically sound. Our process begins with an independent review, not a sales presentation.
Honest Exclusions
When We Decline to Proceed
There are conditions under which we will not accept a case for coordination, regardless of how strongly a patient wishes to proceed. We state these in writing, early, and without apology.
- Uncontrolled diabetes, particularly with glycated hemoglobin above accepted surgical thresholds, until the condition is medically managed
- Active radiation therapy involving the jaws, or a recent history of such treatment without medical clearance
- Current or recent use of intravenous bisphosphonates or related anti-resorptive medications associated with osteonecrosis of the jaw
- Heavy tobacco use that the patient is unwilling to modify during the healing period
- Untreated severe periodontal infection without a clear staged treatment plan
- Severe bone loss beyond what can be addressed with bone augmentation or zygomatic implants, which may require a different surgical approach entirely
- Medical or psychological factors that make the two-visit international treatment pathway unwise
In these situations, we either defer the case until conditions change, refer the patient to a more appropriate pathway, or — where honest discussion supports it — recommend that the patient pursue treatment closer to home. Dental tourism is not a universal good. It is a reasonable option for a reasonably defined group of patients.
The Biomechanics
Why Four or Six Implants Can Carry a Full Arch
To a patient, the idea that four implants can support twelve or fourteen teeth often sounds unreasonable. The answer lies in how force is distributed, not in how many points of support exist.
A fixed full-arch prosthesis behaves as a rigid beam. When implants are placed with sufficient spread along the arch — and when the posterior implants are tilted to engage a longer span of cortical bone — the effective support length is far greater than the distance between the implant platforms alone would suggest. Finite-element analyses published over the past two decades have repeatedly shown that four well-positioned implants can distribute occlusal load within the physiological tolerance of peri-implant bone, provided the patient's bite force and habits fall within expected ranges.
Where those ranges are exceeded — in heavy bruxers, in patients with stiff opposing arches, in cases where anterior bone volume is limited — the reserve capacity of a four-implant configuration narrows. Six implants add margin. They do not guarantee a better outcome, but they reduce the biomechanical penalty of an unexpected load event, a fractured prosthesis, or the need to retrieve a single implant while the others continue to support the arch.
This is the engineering framework behind the clinical decision. It is not marketing.
Materials and Prosthetics
What Goes Into the Arch That Stays in Your Mouth
The implants themselves are manufactured from commercially pure titanium or titanium alloy, with surfaces treated to enhance bone cell adhesion during the osseointegration phase. Our partner clinics use internationally recognized implant systems — including Straumann, Nobel Biocare, and equivalent manufacturers with full FDA and CE clearance — selected per case based on anatomy, surgical approach, and the practical need for globally serviceable components years after treatment.
The provisional prosthesis placed at or near the time of surgery is typically fabricated from reinforced acrylic (PMMA). It is designed to function reliably through the healing period of three to six months but is not intended as a permanent solution.
The definitive prosthesis, placed after osseointegration is confirmed, is most commonly fabricated from full-contour monolithic or layered zirconia on a titanium framework — a combination chosen for its durability, aesthetic stability, and resistance to the wear patterns that shortened the lifespan of earlier acrylic-metal hybrids. For selected patients, other material configurations are clinically indicated, and the choice is discussed in writing before the final impressions are taken.
The Protocol
The Clinical Sequence, Step by Step
Nothing about this pathway should feel improvised. Each step is ordered, documented, and reviewed before the next begins.
01
Initial Case Review
The patient submits clinical photographs, a recent panoramic radiograph, and a medical history summary. Dr. Sayıner reviews the material and returns a written preliminary assessment identifying whether the case is a candidate and what additional imaging or records are needed.
02
CBCT and Diagnostic Planning
A cone-beam computed tomography scan is obtained, either at a United States imaging center or on arrival in Istanbul. The scan is used to model the jaws digitally, measure bone volume at each planned implant site, and identify anatomical constraints.
03
Written Treatment Plan
A transparent, written treatment plan is issued identifying the recommended implant configuration, prosthetic material selection, surgical timeline, and expected healing period. Any adjunctive procedures — extractions, bone augmentation, sinus lifting — are explicitly itemized.
04
Surgical Guide Fabrication
For most cases, a patient-specific surgical guide is fabricated from the digital plan. The guide controls the angle, depth, and position of each implant at surgery, translating the plan into physical precision.
05
Implant Surgery and Immediate Provisional
Under local anesthesia and optional intravenous sedation, non-restorable teeth are extracted, the implants are placed through the surgical guide, and — where primary stability allows — a fixed provisional prosthesis is delivered the same day or the following day. The patient leaves Istanbul with functional, fixed teeth.
06
Healing Period
A three to six month period of osseointegration follows. The patient returns home and wears the provisional prosthesis. Soft-tissue checks are coordinated with the patient's United States dental provider, and clinical questions are handled directly by our coordination office.
07
Final Impressions and Definitive Prosthesis
The patient returns to Istanbul for a second visit of three to four days. Osseointegration is confirmed, final impressions are taken, and the definitive zirconia prosthesis is delivered and refined to occlusion.
08
Long-Term Follow-Up
A written maintenance protocol is provided. Recall visits are coordinated with the patient's United States provider, with radiographic and clinical review at intervals appropriate to the individual case.
Clinical Leadership
Why Dr. Sayıner's Research Matters Here
Every implant case depends on a single biological question: will this piece of titanium integrate with this patient's bone, and will that integration hold under load? The answer depends on surgical technique, on the implant surface, on the patient's systemic health — and, critically, on the pharmacology of the healing environment.
Doctoral Research · Yeditepe University, 2021
"The Effects of Systemic Pantoprazole on Bone Healing and Implant Osseointegration"
Dr. Hanzade Hazal Sayıner completed her PhD in Oral and Maxillofacial Surgery at Yeditepe University, with a doctoral thesis investigating how a widely prescribed class of acid-reducing medications affects the bone healing processes that determine whether an implant succeeds or fails.
The clinical relevance is direct. A meaningful percentage of full-arch implant candidates arrive taking proton pump inhibitors, often without realizing these medications can alter the cellular signaling pathways that regulate new bone formation. Understanding that interaction is not an academic exercise. It informs how we review medications at intake, when we recommend temporary adjustment in coordination with the patient's primary physician, and how we set expectations about healing timelines.
Dr. Sayıner's clinical focus — implant surgery, sinus augmentation, bone augmentation, and the management of complex full-arch cases — is the same focus our coordination work is organized around. Her role in our pathway is to review each case at intake, to confirm that the treatment plan issued by the partner clinic reflects sound clinical judgment, and to remain available for case-specific questions throughout the treatment period.
Dr. Sayıner's role in our coordination network is clinical oversight and case review. Clinical diagnosis and treatment delivery are the responsibility of the treating licensed dental professional at the assigned partner clinic.
The Timeline, Honestly
This Is Not a One-Week Treatment
We want to address directly a marketing claim you may have encountered elsewhere: that full-arch implant rehabilitation can be completed in a single visit of seven to ten days. It cannot.
What can be completed in a first visit is the surgical phase and the delivery of a fixed provisional prosthesis. The patient arrives, is examined, undergoes surgery, receives functional fixed teeth, and returns home within approximately five to seven days. This is a real clinical milestone and, for patients who have lived with failing dentition or removable dentures, it is often the most emotionally significant moment of the entire pathway.
What cannot happen in that first visit is the delivery of the definitive prosthesis. Titanium does not integrate with bone in a week. Osseointegration requires three to six months of undisturbed healing, during which the provisional absorbs normal function while the bone does the biological work of locking onto the implant surfaces. Delivering a final zirconia prosthesis before that process is complete invites early overload, implant loss, or prosthetic failure — outcomes we have seen referred to us from patients treated elsewhere under the "one-week smile" framework.
A second visit is therefore part of the treatment, not an optional upgrade. It is typically three to four days, and it is during this visit that the outcome you will live with for the next fifteen or twenty years is finalized.
Risk Disclosure
What Can Go Wrong
No implant treatment is without risk. A consultation that does not name the failure modes of the procedure is not a consultation. It is a sales conversation.
Implant failure. Long-term survival rates for tilted posterior implants in full-arch rehabilitation are reported in the published literature at above 95 percent at five years, and in many series above 97 percent. These rates are excellent but not perfect. A small percentage of implants fail to integrate, most often within the first few months, and must be removed and either replaced or compensated for prosthetically.
Sinus complications. In upper-jaw cases where posterior bone volume is limited, sinus membrane perforation during implant placement or adjunctive augmentation is a recognized complication. Most are small and managed intraoperatively. Larger perforations can require staged treatment.
Nerve involvement. In lower-jaw cases, the inferior alveolar nerve runs close to typical posterior implant positions. Surgical planning via CBCT and guided surgery is designed to maintain a safe distance, but transient or, rarely, persistent altered sensation in the lower lip or chin is a known risk.
Prosthetic fracture. Even well-designed full-arch prostheses can fracture under unusual force, particularly in patients with undiagnosed bruxism. Modern zirconia reduces but does not eliminate this risk.
Phonetic and functional adaptation. The transition from natural dentition, from failing teeth, or from removable dentures to a fixed full-arch prosthesis changes the oral environment in ways that require weeks of adaptation. Speech patterns, chewing habits, and tongue positioning all adjust. This adaptation is expected and, for most patients, complete within a month.
We provide these points in writing before any surgical commitment. A patient who has not read them has not given informed consent.
Alternatives
When We May Recommend Something Else
All-on-4 and All-on-6 are powerful rehabilitations for the right patient. They are not the right answer for every patient who asks about them.
When a patient presents with posterior maxillary bone height below approximately four millimeters despite sinus augmentation potential, conventional tilted implants may not engage sufficient bone to support immediate loading. In these cases, zygomatic implants — longer implants anchored in the zygomatic bone rather than the alveolar ridge — can be the more defensible surgical choice. Zygomatic surgery requires specific surgical expertise and is discussed in detail during case review.
When a patient is missing a small number of teeth in otherwise healthy dentition, single implants with individual crowns preserve existing teeth and produce superior long-term aesthetics compared with a full-arch prosthesis that would require the removal of viable teeth. We will not recommend a full arch to a patient who does not need one, regardless of how the question is first framed.
For selected patients with adequate posterior bone, six to eight vertical implants with separate crowns or short-span bridges remain a legitimate alternative to full-arch fixed prostheses. This configuration can be easier to maintain over decades and allows segment-by-segment replacement if a single unit fails, though it requires greater surgical coverage and more prosthetic complexity.
And finally, for patients whose medical, financial, or logistical circumstances make international treatment unwise, we will say so plainly. Coordination is our service. It is not our only possible recommendation.
Clinical Consultation
Begin Your Case Review
Your inquiry is reviewed by a clinical coordinator and prepared for assessment by Dr. Sayıner. All communication is confidential.