Dental Implant All-on-4 vs All-on-6: Key Differences and How to Choose

When comparing dental implant all on 4 vs all on 6 options, both are full-arch systems that replace an entire row of teeth using a hybrid prosthesis anchored to dental implants. The main difference is the number of implants per arch: 4 implants versus 6 implants. Each approach has advantages depending on your bone density, jaw anatomy, and long-term oral health goals. A prosthodontist can help you determine which option fits your needs.

8 min readMedically reviewed contentLast updated March 20, 2026

Key Takeaways

All-on-4 uses four implants per arch, with two angled posteriorly to maximize bone contact. All-on-6 uses six implants, distributing chewing forces across more points.
All-on-6 may be recommended when additional support is needed, such as in the upper jaw where bone is less dense or for patients who grind their teeth.
All-on-4 typically costs $15,000 to $30,000 per arch. All-on-6 typically costs $20,000 to $40,000 per arch. Costs vary by location, provider, and case complexity.
Both systems can provide same-day temporary teeth, with the final prosthesis placed after 3 to 6 months of healing.
Long-term studies show high success rates for both approaches, with 10-year implant survival above 94% for All-on-4.
A prosthodontist is the specialist who designs the final prosthesis and coordinates the overall treatment plan for full-arch implant restoration.

What Are All-on-4 and All-on-6 Implants?

Both All-on-4 and All-on-6 are full-arch dental implant solutions designed to replace all the teeth in one jaw with a single set of fixed teeth. Instead of placing one dental implant per missing tooth, these systems use fewer implants in strategic positions to support a complete bridge. The result is a permanent set of teeth anchored by dental implants that look, feel, and function like natural teeth.

The All-on-4 concept, developed by Dr. Paulo Malo, uses 4 dental implants per arch. Two implants are placed vertically in the front of the jaw, and two are tilted at angles of up to 45 degrees in the back. This angulation allows the posterior 4 implants to anchor into areas of higher bone density closer to the front of the jaw, often eliminating the need for bone grafting. The approach works well even for patients with reduced bone density in the posterior jaw.^[1]

All-on-6 follows the same principle but uses 6 dental implants instead of four. The additional 6 implants are typically placed in the premolar or posterior region. Having 6 implants per arch provides extra support points and distributes biting forces across a wider area of the jawbone. This makes All-on-6 dental implants a strong option when greater stability is needed.

Key Differences Between All-on-4 and All-on-6

The choice between four and six implants affects several aspects of treatment, from surgical complexity to long-term force distribution. Here are the primary differences.

Stress Distribution and Biomechanics

More dental implants mean more points of contact between the prosthesis and the jawbone. With 6 implants, the chewing forces are spread across a larger area, reducing the stress on each individual implant. This improved force distribution can help prevent bone loss around each implant site. The benefit is particularly notable for patients who generate high bite forces, such as those who clench or grind their teeth (bruxism).

With 4 implants, each dental implant bears a larger share of the load. The All-on-4 system compensates by using angled posterior implants that engage more bone surface area. For most patients, fewer implants still provide more than adequate support. However, in cases with higher mechanical demands, the additional support of 6 implants may reduce long-term stress and lower the risk of bone loss around the prosthesis.

Who Is a Candidate for Each?

All-on-4 dental implants are designed to work for patients with moderate bone loss, particularly in the back of the lower jaw. The angled 4 dental implants bypass areas of low bone density, which is why many All-on-4 patients can avoid bone grafting entirely. This makes the procedure accessible even for patients who have experienced significant bone loss after years of wearing removable dentures.

All-on-6 requires sufficient bone density in more locations across the arch to support the additional implants per arch. Patients with good overall bone volume are candidates for 6 implants. In some cases, minor bone grafting may be performed at the time of implant placement to accommodate the extra implants. Your prosthodontist and oral surgeon will evaluate your bone density with CBCT imaging to determine the right treatment plan and how many implants per arch your anatomy supports.

Prosthesis Design

The prosthesis, often called a hybrid prosthesis, can be made from similar materials for both systems. Options include acrylic with a titanium or cobalt-chrome framework, or full zirconia. A hybrid prosthesis combines a metal substructure with tooth-colored material on top, providing strength and a natural appearance. With 6 dental implants, the prosthodontist has more flexibility in designing a longer prosthesis that extends further back in the arch, potentially restoring more teeth in the posterior region.

With 4 dental implants, the prosthesis typically extends to the first molar region. With six, it may extend to include second molars, providing more chewing surface. The additional posterior fixed teeth can improve chewing efficiency. Many All-on-4 patients report excellent function even with fewer implants, and the standard prosthesis length is sufficient for most daily activities including eating and speaking.

Cost Comparison: All-on-4 vs All-on-6

All-on-6 dental implants cost more than All-on-4 due to the additional implants, longer surgical procedures, and potentially more complex hybrid prosthesis design. Here are typical cost ranges. Costs vary by location, provider, and case complexity.

All-on-4 generally ranges from $15,000 to $30,000 per arch. This includes the 4 dental implants, the surgical placement, the temporary prosthesis provided on the day of surgery, and the final prosthesis placed after healing. The wide range reflects differences in prosthesis material (acrylic vs. zirconia), geographic location, and provider fees.^[2]

All-on-6 generally ranges from $20,000 to $40,000 per arch. The higher cost reflects the 6 dental implants and the associated surgical procedures and prosthetic work. If bone grafting is needed to support the additional 6 implants, that adds $500 to $3,000 per graft site.

Most dental insurance plans provide limited coverage for implant-supported prostheses. Some plans cover a portion of the prosthesis as a denture benefit. Ask your provider about financing options, as many prosthodontic practices offer payment plans for full-arch treatment.

Long-Term Success and Outcomes

Both All-on-4 and All-on-6 dental implants have strong track records. The All-on-4 system has the longest history and the most published research, with studies reporting cumulative implant survival rates above 94% at 10 years and above 93% at 15 years regardless of how many implants per arch were placed.^[3]

All-on-6 outcomes are also favorable, though the published long-term data is not as extensive as All-on-4. The additional dental implants provide a built-in safety margin: if one of the 6 implants fails, the prosthesis can still be supported by the remaining five. With All-on-4, the loss of a single implant may require revision of the prosthesis design.

The most important factors for long-term success with either system are consistent oral hygiene, regular dental checkups, and protecting your oral health by avoiding habits that place excessive stress on the prosthesis. Smoking significantly increases the risk of implant failure and accelerates bone loss regardless of the number of dental implants placed.

Maintenance and Follow-Up

Both All-on-4 and All-on-6 dental implants require professional maintenance to protect your long-term oral health. Your prosthodontist will typically recommend checkups every 6 months. During these visits, the prosthesis may be removed for cleaning underneath, and the dental implants and surrounding tissue are examined for signs of inflammation.

Daily home care involves brushing the prosthesis and using specialized tools like water flossers or interproximal brushes to clean around the implant abutments. Your prosthodontist will demonstrate the specific cleaning technique for your prosthesis type.

When Is All-on-6 Recommended Over All-on-4?

Your prosthodontist may recommend 6 implants over four in specific clinical scenarios. When weighing all on 4 vs all on 6, the right choice depends on your anatomy, bite forces, and treatment goals.

Upper jaw restoration: The upper jaw (maxilla) has less dense bone than the lower jaw, and the additional dental implants provide extra anchorage in softer bone.
Bruxism (teeth grinding or clenching): Patients with heavy bite forces benefit from distributing those forces across more implants per arch to reduce stress on each one.
Longer prosthesis span: When the treatment plan calls for restoring fixed teeth further back in the arch, including second molars, additional implants are needed to support the longer bridge.
Adequate bone density throughout the arch: Patients with good bone density across the full arch can support 6 implants and may benefit from the additional redundancy.
Patient preference for maximum security: Some patients prefer the peace of mind that comes with extra implant support, even when fewer implants would be clinically sufficient.

Why See a Prosthodontist for Full-Arch Implants

A prosthodontist is the dental specialist trained in the design and placement of complex dental prostheses, including full-arch dental implant restorations. While oral surgeons and some general dentists place dental implants, the prosthodontist is the specialist who plans the overall treatment plan, determines the ideal implant positions for the best functional and aesthetic outcome, and coordinates all surgical procedures involved in the restoration.

For full-arch cases, the prosthodontist typically serves as the treatment coordinator, working with an oral surgeon or periodontist who performs the implant surgery. This team approach ensures that the implants are placed in positions that support the best possible prosthesis. Learn more about [prosthodontic care](/specialties/prosthodontics) and how a prosthodontist manages full-arch implant treatment.

Find a Prosthodontist Near You

Every prosthodontist on My Specialty Dentist has verified specialty credentials. Search by location to find board-certified prosthodontists in your area who specialize in full-arch implant restoration.

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Frequently Asked Questions

Is All-on-6 better than All-on-4?

Neither is universally better. All-on-6 provides more support points and distributes forces across more implants, which can benefit patients with softer bone or heavy bite forces. All-on-4 is well-proven with extensive long-term data and works well for most patients, often without bone grafting. Your prosthodontist will recommend the best option based on your anatomy and needs.

How long do All-on-4 and All-on-6 implants last?

The implants themselves are designed to last a lifetime with proper care. Studies show All-on-4 implant survival above 94% at 10 years. The prosthesis (the visible teeth) may need replacement or repair after 10 to 20 years due to normal wear. Regular checkups and good oral hygiene are the most important factors in longevity.

Can you get All-on-4 or All-on-6 without bone grafting?

All-on-4 is specifically designed to minimize the need for bone grafting by using angled posterior implants. Many patients can proceed without any grafting. All-on-6 is more likely to require minor grafting since it places implants in more locations across the arch. Your specialist will determine whether grafting is needed based on CBCT imaging.

Do you get teeth the same day with All-on-4 or All-on-6?

Yes, both procedures typically include a temporary prosthesis placed on the day of surgery. This means you leave the appointment with a full set of functional teeth. The temporary prosthesis is replaced with the final version after 3 to 6 months of healing, once the implants have fully integrated with the bone.

What is the failure rate of All-on-4 implants?

Published studies report All-on-4 cumulative implant survival rates above 94% at 10 years. Failure is most often associated with smoking, uncontrolled diabetes, poor oral hygiene, or bruxism. If a single implant fails, it can usually be replaced, though the prosthesis design may need to be modified.

Does insurance cover All-on-4 or All-on-6?

Most dental insurance plans provide limited coverage for implant-supported prostheses. Some plans cover a portion under their denture benefit. Coverage varies widely by plan. Many prosthodontic practices offer financing or payment plans. Ask your provider's office to submit a pre-authorization to your insurance before treatment to understand your coverage.

What is a hybrid prosthesis for dental implants?

A hybrid prosthesis is the fixed set of replacement teeth attached to your dental implants. It combines a metal framework (titanium or cobalt-chrome) with tooth-colored acrylic or porcelain on top. The hybrid prosthesis is screwed onto the implants and can only be removed by your prosthodontist for cleaning and maintenance. Both All-on-4 and All-on-6 systems use this type of prosthesis.

Is All-on-4 or All-on-6 better for the lower jaw?

The lower jaw typically has denser bone than the upper jaw, so 4 dental implants are often sufficient for the lower jaw. All-on-4 was originally developed and studied primarily in the lower jaw (mandible). All-on-6 may be preferred for the upper jaw where bone density is lower. Your prosthodontist will evaluate your specific anatomy to recommend the right number of implants per arch.