All-on-4 and All-on-6 dental implants replace a complete arch of missing or failing teeth with a fixed implant-supported restoration. The main difference is that All-on-4 uses four implants, while All-on-6 uses six to create additional support and distribute biting forces across more points.
At KissDent in Tirana, the choice between All-on-4 and All-on-6 is made after examining the patient’s bone, bite and prosthetic needs, not by automatically recommending more implants.
The Main Difference Is About Support, Not Just The Number Of Implants
It may appear that All-on-6 must always be better because it uses two additional implants. The clinical decision is more complex.
Four correctly positioned implants may provide sufficient support for a complete arch. In other cases, six implants can offer a wider distribution of forces and more flexibility when designing the final bridge.
The correct number depends on where strong bone is available and how the restoration will function. Recent comparative research has not found an automatic overall implant-survival advantage for six implants in every patient, supporting an individual rather than numerical approach.
How Does All-on-4 Work?
Impianti dentali All-on-4 use four implants to support a fixed restoration replacing all the teeth in one arch.
Two implants are usually positioned toward the front of the jaw. The two posterior implants may be angled to use the available bone more effectively and reduce the unsupported length at the back of the bridge.
This approach may be valuable when bone is limited in certain posterior areas. Angled placement can sometimes reduce the need for more extensive bone regeneration, although it cannot eliminate additional procedures in every case.
All-on-4 may be considered for patients who:
- have lost all teeth in one arch;
- have remaining teeth that cannot be preserved;
- want a fixed alternative to a removable denture;
- have enough bone to stabilise four implants;
- have limited posterior bone;
- need a less extensive implant configuration.
A CBCT scan is required to confirm whether the available bone can safely support this design.
How Does All-on-6 Work?
Impianti dentali All-on-6 use six implants distributed across the jaw to support the complete bridge.
The two additional implants create more support points. This can allow forces to be distributed over a broader area and give the prosthetic team more options when planning the bridge.
All-on-6 may be appropriate when:
- sufficient bone is available for six implants;
- the patient has a strong bite;
- the planned bridge requires broader support;
- implant positions can be distributed effectively;
- the length or design of the restoration benefits from additional anchorage;
- the clinical team wants to reduce the force placed on each implant.
The implants still need to be placed in useful positions. Six implants positioned poorly are not preferable to four implants placed according to a precise surgical and prosthetic plan.
All-on-4 vs All-on-6: Comparison
| Fattore | All-on-4 | All-on-6 |
| Implants per arch | Four | Six |
| Support points | Fewer | Two additional points |
| Force distribution | Shared across four implants | Distributed across a broader base |
| Bone requirements | May work with more limited bone | Requires suitable bone in six positions |
| Posterior implants | Often angled | Position depends on the individual plan |
| Rigenerazione ossea | May sometimes reduce the need | May be necessary to create suitable sites |
| Surgery | Four implant placements | Six implant placements |
| Temporary bridge | May be possible when stability is sufficient | May be possible when stability is sufficient |
| Restauro finale | Fixed full-arch bridge | Fixed full-arch bridge |
| Best suited for | Efficient use of available bone | Cases that benefit from broader support |
1. Available Bone Is the First Deciding Factor
All-on-4 may be suitable when enough healthy bone is available in four strategic positions. All-on-6 requires adequate bone across a wider area to support two additional implants.
A CBCT scan helps the dentist evaluate bone height, density and distribution before deciding which option provides the most stable support.
2. The Upper and Lower Jaws May Need Different Plans
The upper and lower jaws do not always have the same bone structure.
Upper-jaw bone is often less dense, particularly in posterior areas near the sinuses. The lower jaw may provide denser bone but also requires careful planning around the mandibular nerve.
A patient can therefore receive All-on-4 in one arch and All-on-6 in the other. There is no clinical requirement for the upper and lower restorations to use the same number of implants.
Each arch should be evaluated separately according to its anatomy, available support and the forces expected during chewing.
3. Bite Strength Affects the Choice
Patients with strong bite forces, grinding or clenching may benefit from the broader force distribution provided by six implants. This depends on whether the jaw has enough suitable bone for their placement.
However, implant number cannot correct a poorly designed bite. Accurate bridge planning, regular monitoring and a protective night guard when recommended remain important for both treatments.
4. Bridge Design Is Equally Important
All-on-4 and All-on-6 describe the number of implants, but the patient uses the bridge—not the implants alone.
The final result also depends on:
- the material used for the bridge;
- the length of the restoration;
- spacing between implant connections;
- the unsupported area behind the final implant;
- passive fit;
- tooth position;
- bite contacts;
- access for cleaning.
The implantologist and dental technician must therefore plan the case together. Implant positions should support the intended restoration rather than being selected independently and handed to the laboratory afterward.
5. More Implants Do Not Automatically Mean a Better Result
All-on-6 can provide additional support, but this does not make it the correct treatment for every patient.
Placing six implants may be unnecessary when four implants can already support the planned restoration correctly. Additional implants also require suitable bone and safe anatomical positions.
The quality of the result depends on several factors beyond the number:
- patient selection;
- implant stability;
- surgical accuracy;
- prosthetic fit;
- oral hygiene;
- smoking;
- control of gum disease;
- maintenance appointments.
6. How Bone Loss Influences the Choice
A patient with bone loss may assume that All-on-6 provides greater security. In reality, reduced bone can make it difficult to position six implants correctly.
All-on-4 may sometimes use angled posterior implants to avoid areas with insufficient bone. This can reduce the need for extensive bone regeneration or sinus lift in selected cases.
However, severe or poorly distributed bone loss may still require an additional procedure. Alternatively, a customised All-on-X plan may use a different implant number or position.
The correct solution depends on where the bone remains, not simply on how much has been lost overall.
Is the Recovery Different?
The general recovery process is similar because both procedures involve implant surgery and a full-arch provisional restoration.
All-on-6 includes two additional implant sites, but recovery is influenced by more than implant number. Extractions, bone procedures, the patient’s general health and the complexity of surgery may have a greater effect.
During early healing, patients normally receive instructions covering:
- medication;
- oral hygiene;
- suitable foods;
- activity;
- cleaning around the bridge;
- signs that require contacting the clinic.
Following these instructions is important because the provisional teeth must remain protected while the implants integrate with the bone.
How KissDent Chooses Between All-on-4 and All-on-6
KissDent does not select the treatment from the number of implants alone. The team evaluates the jaw through clinical examination, CBCT imaging and digital prosthetic planning.
The assessment considers:
- bone volume and density;
- safe implant positions;
- number and condition of remaining teeth;
- bite strength;
- space available for the restoration;
- need for extractions;
- possible bone procedures;
- final bridge design;
- the patient’s general health and maintenance ability.
The surgical plan is coordinated with KissDent’s in-house CAD/CAM laboratory. This allows implant placement, provisional teeth and the definitive bridge to be planned as parts of the same treatment.
The final restoration can be designed and produced on-site, allowing the clinical and technical teams to check the fit, bite and appearance directly.
All-on-4 or All-on-6: Which Is Better?
Neither treatment is universally better.
All-on-4 can provide an efficient fixed restoration when four well-positioned implants offer the support required. It may also be useful when posterior bone is limited.
All-on-6 can be preferable when the jaw provides suitable implant sites and the restoration benefits from wider support. The two additional implants may be especially useful in cases involving stronger forces or specific prosthetic requirements.
The best treatment is the one selected after examining the bone and planning the final teeth, not the option with the largest number in its name.
Find the Right Full-Arch Solution at KissDent 🦷✨
Unsure whether you need All-on-4 or All-on-6 dental implants? Send KissDent your panoramic X-ray or available CBCT scan for an initial assessment.
The team can review your case, explain the possible options and prepare a preliminary treatment timeline before you travel to Tirana.
📲 WhatsApp: +355 69 206 2408
📧 Email: info@kissdent.info
