What This Guide Covers and Who It Is For
This guide explains the differences between All-on-4 and All-on-6 dental implants so you can make a more informed choice. Both are full-arch implant systems. That means they replace all the teeth in your upper jaw, lower jaw, or both.
If you are missing most or all of your teeth, or if your remaining teeth are failing, a full-arch implant restoration may be an option. These systems anchor a fixed bridge (a non-removable set of prosthetic teeth) directly to implants placed in your jawbone. Unlike traditional dentures, the bridge stays in place. You do not remove it for cleaning or sleeping.
This guide is for anyone comparing these two approaches. It covers how each system works, what the treatment process looks like, how much each typically costs, and when to see a specialist. Whether your general dentist mentioned implants or you are researching on your own, the sections below break down what matters most.
How All-on-4 and All-on-6 Work
Both systems replace a full arch of teeth using implants surgically placed into the jawbone. The key difference is the number of implants and how they share the load of biting and chewing.
All-on-4: Four Implants Per Arch
The All-on-4 protocol places two implants straight into the front of the jaw and two implants at an angle in the back. The angled rear implants serve a specific purpose. They grip into denser bone closer to the front of the jaw, which often lets patients avoid bone grafting (a surgical procedure that adds bone volume to the jaw).
This angled placement also means the implants can support a bridge that extends further back in the mouth, covering more teeth. The result is a fixed prosthesis that typically spans 10 to 14 teeth per arch. Because only four implants are needed, the surgery is often shorter and the healing period can be more straightforward.
All-on-4 has the longest published track record among full-arch immediate-load protocols. Studies following patients for 10 years or more report implant survival rates above 94%. Results vary depending on factors like bone quality, oral hygiene, and overall health.
All-on-6: Six Implants Per Arch
The All-on-6 protocol adds two more implants, typically in the premolar region. These extra implants spread chewing forces across six points instead of four. Each individual implant bears a smaller share of the total load.
This additional support can be helpful in specific situations. The upper jaw, called the maxilla, tends to have softer, less dense bone than the lower jaw. Six implants may provide better stability in that softer bone. Patients who clench or grind their teeth, a habit called bruxism, also place greater force on their restorations. Extra implants can help absorb that force.
If one implant in a six-implant system fails, the remaining five may still be able to support the prosthesis while the issue is addressed. With four implants, losing even one can compromise the entire restoration. This built-in redundancy is one reason some clinicians prefer the six-implant approach for certain patients.
Side-by-Side Comparison
Both systems achieve the same basic goal: a fixed, non-removable set of teeth anchored to implants. The differences come down to how many implants share the load, how much bone you need, and what the treatment costs.
- Number of implants: All-on-4 uses four per arch. All-on-6 uses six per arch.
- Force distribution: Six implants spread chewing forces more evenly. This may matter more for bruxism patients or upper jaw cases.
- Bone grafting: All-on-4's angled implants often avoid the need for bone grafts. All-on-6 may require grafting if bone volume is limited in the premolar areas.
- Redundancy: Losing one implant in a six-implant system is typically less disruptive than losing one in a four-implant system.
- Surgery time: Placing six implants generally takes longer than placing four, though both are typically completed in a single surgical appointment.
- Cost: All-on-6 typically costs more due to the additional implants and components.
What You Need to Know Before Choosing
The best option depends on your bone density, jaw anatomy, bite forces, and overall health. Your clinician will assess these factors before recommending a specific approach.
Who Is a Candidate
Most adults who are missing all or most of their teeth in an arch can be considered for either system. There is no strict age cutoff, but the jawbone should be fully developed. That typically means patients should be at least 18 years old.
Good candidates are generally in stable overall health. Uncontrolled diabetes, active cancer treatment, and certain medications that affect bone healing, such as high-dose bisphosphonates, may affect eligibility. Smoking significantly increases the risk of implant failure. Your clinician will review your medical history in detail.
A cone beam CT scan (a 3D X-ray of your jaw) is used to measure the amount and density of available bone. This scan helps determine whether four implants can achieve adequate support or whether six would be a better fit. It also shows the location of nerves and sinuses that the surgeon must avoid.
Upper Jaw vs. Lower Jaw Considerations
The lower jaw, or mandible, is typically denser and offers more bone for implant placement. Four implants in the lower jaw often provide excellent long-term stability. Many clinicians consider All-on-4 a reliable standard for the mandible.
The upper jaw presents more challenges. The maxillary sinuses (air-filled spaces above the back teeth) limit where implants can be placed. The bone is also less dense. For these reasons, some clinicians recommend six implants in the upper jaw to create a wider, more stable foundation. However, All-on-4 has also been used successfully in the upper jaw in many cases, especially when the angled implants achieve strong initial stability.
How to Prepare
Preparation begins with a thorough evaluation. Expect a clinical exam, the CT scan described above, photographs, and impressions or digital scans of your mouth. Your clinician will discuss your medical history, medications, and habits like smoking or teeth grinding.
If you have remaining teeth that need extraction, those removals are often done at the same appointment as implant placement. You may be asked to stop smoking several weeks before surgery, as tobacco use impairs blood flow and slows bone healing. Your clinician may also adjust certain medications before the procedure. [2]
What to Expect During Treatment
Treatment typically involves one surgical appointment followed by a healing period, then delivery of the final prosthesis. Here is a general timeline.
The Surgical Appointment
The procedure is usually performed under IV sedation or general anesthesia. You will be comfortable and will not feel pain during the surgery. The surgeon removes any remaining teeth, places the implants into the jawbone, and attaches connector pieces called abutments.
In many cases, a temporary fixed bridge is attached to the implants the same day. This is called immediate loading. You leave the appointment with a set of non-removable temporary teeth. These temporary teeth are functional but are made from lighter materials than the final prosthesis. The entire surgical appointment typically takes two to four hours per arch.
Healing and Osseointegration
Over the next three to six months, the implants fuse with the surrounding jawbone. This process is called osseointegration. It is what gives the implants their long-term strength and stability.
During this healing period, you will eat a softer diet for the first several weeks. Your clinician will schedule follow-up visits to check healing, adjust the temporary bridge if needed, and monitor the bone around each implant. Most patients return to a normal diet within a few weeks, though hard or very chewy foods should be avoided until the final prosthesis is placed.
The Final Prosthesis
Once osseointegration is confirmed, your clinician takes new impressions or digital scans. These are used to fabricate the final bridge. Final prostheses are typically made from zirconia (a strong ceramic material) or a metal framework with acrylic teeth.
Zirconia prostheses are highly durable and resist staining. Acrylic-based prostheses are lighter and easier to repair if damaged. Your prosthodontist will discuss which material best fits your situation. The final bridge is then secured to the implants. In most cases, the screws that hold it in place are covered so the bridge looks and feels like natural teeth. [1]
Cost Ranges and Insurance Considerations
All-on-4 typically costs $15,000 to $30,000 per arch, while All-on-6 typically costs $20,000 to $40,000 per arch. Costs vary by location, provider, and case complexity.
Several factors influence the total price. The material of the final prosthesis matters. Zirconia bridges generally cost more than acrylic-based options. If you need bone grafting, sinus lifts, or extractions of remaining teeth, those procedures add to the total. Sedation and anesthesia fees, diagnostic imaging, and the number of follow-up visits also factor in.
Dental insurance coverage for implant-supported restorations varies widely. Some plans cover a portion of the implant surgery but not the prosthesis. Others may cover the prosthesis but classify implants as cosmetic and exclude them. Contact your insurance provider and ask specifically about full-arch implant coverage. Many dental offices also offer payment plans or work with third-party financing companies.
When comparing quotes from different providers, ask what is included. A lower headline price may not cover the temporary prosthesis, extractions, imaging, or follow-up care. Request an itemized treatment estimate so you can compare accurately.
When to See a Specialist
Full-arch implant treatment typically involves both a surgeon and a prosthodontist. Knowing when to seek specialist care helps you get the right team in place.
A prosthodontist is a dentist who has completed additional years of advanced training in restoring and replacing teeth. Prosthodontists design the prosthesis, plan the position and angle of the implants, and coordinate the overall treatment. According to the American College of Prosthodontists, patients with complex restorative needs, including those requiring full-arch implant treatment, benefit from specialist involvement. [1]
The surgical placement of implants is performed by an oral and maxillofacial surgeon or a periodontist (a specialist in gum and bone health). In some practices, a single specialist handles both the surgery and the prosthesis. In others, two specialists collaborate.
You should consider seeing a specialist if you have been told you need all your teeth replaced, if your current dentures are loose or uncomfortable, if you have significant bone loss in your jaw, or if you have medical conditions that may complicate treatment. A general dentist can provide a referral, or you can contact a specialist office directly.
Find a Prosthodontist Near You
A prosthodontist can evaluate your jaw anatomy, discuss whether All-on-4 or All-on-6 is a better fit for your situation, and coordinate your full treatment plan. Visit the prosthodontics page on My Specialty Dentist to search for a qualified specialist in your area and learn more about what to expect at your consultation.
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