The Difference Between All-on-4 and All-on-6: A Clinical Comparison

# The Difference Between All-on-4 and All-on-6: A Clinical Comparison

If you are missing most or all of your teeth, you have likely encountered the terms All-on-4 and All-on-6. Both are advanced, full-arch implant solutions that restore a complete set of fixed teeth in a single procedure. However, the clinical difference between them is significant, and choosing the right one depends on your bone density, jaw anatomy, long-term goals, and budget. For UK patients, understanding these differences is crucial before committing to treatment, especially when considering options abroad. This article provides a thorough, evidence-based comparison to help you make an informed decision.

Understanding the Fundamentals: What Are All-on-4 and All-on-6?

Both All-on-4 and All-on-6 are implant-supported full-arch prostheses. They replace an entire arch of teeth (upper or lower) using a fixed bridge secured by dental implants. The key difference lies in the number of implants used: four versus six.

All-on-4: The Original Full-Arch Solution

Developed by Portuguese dentist Dr. Paulo Maló in the 1990s, the All-on-4 technique uses four implants per arch. Two are placed straight (vertical) in the front of the jaw, and two are placed at an angle (tilted) in the back, typically at 30 to 45 degrees. This angled placement allows the surgeon to avoid the maxillary sinus in the upper jaw and the inferior alveolar nerve in the lower jaw, maximising contact with available bone. The result is a stable, fixed bridge that can be loaded with a temporary prosthesis on the same day.

All-on-6: The Enhanced Stability Option

All-on-6 uses six implants per arch. The implants are placed vertically or with a slight tilt, depending on the bone anatomy. The additional two implants provide greater surface area for osseointegration (the process where bone fuses with the implant), leading to increased stability and load distribution. This technique is particularly beneficial for patients with sufficient bone volume who want a longer-term, more robust solution.

Clinical Comparison: Key Differences

1. Bone Density and Jaw Anatomy Requirements

The most critical factor in choosing between the two is your bone quality and quantity.

• All-on-4: Designed for patients with moderate to severe bone loss. Because the two posterior implants are angled, they engage the denser, stronger bone regions (the pterygoid region in the upper jaw and the mental foramen area in the lower jaw). This makes All-on-4 suitable for many patients who would otherwise require bone grafting. The General Dental Council (gdc-uk.org) recognises that this technique reduces the need for sinus lifts and nerve repositioning, making it less invasive.
• All-on-6: Requires adequate bone volume in both the anterior and posterior regions. The two extra implants need vertical bone height and sufficient width to be placed safely. If you have significant bone loss, you may need bone grafting before or during the procedure. The British Dental Association (bda.org) advises that a thorough CBCT scan is essential to assess whether you are a candidate for six implants.

Practical advice: If you have been told you have "thin jawbones" or have been a denture wearer for many years, All-on-4 may be your best option. If you have healthy, dense bone, All-on-6 can offer superior long-term stability.

2. Number of Implants and Surgical Complexity

• All-on-4: Involves placing four implants. The surgery is typically faster (around 2–3 hours per arch) and less invasive. There is less post-operative swelling and discomfort because fewer implants are placed. The angled placement also reduces the need for extensive incisions.
• All-on-6: Requires six implants, which means more drilling, longer surgery time (3–4 hours per arch), and potentially more post-operative discomfort. The procedure is more complex, especially if bone grafting is needed. However, the additional implants provide a wider distribution of chewing forces, reducing the risk of implant overload.

3. Immediate Loading and Healing Time

Both techniques can often be loaded with a temporary fixed bridge on the same day, provided the implants achieve sufficient primary stability (torque of at least 30 Ncm). However, there are nuances.

• All-on-4: The angled placement typically achieves high primary stability, making immediate loading more predictable. The temporary bridge is usually made of acrylic and is designed to be non-loading for the first few months.
• All-on-6: With six implants, the stability is generally even higher, which can allow for a more robust temporary bridge. However, the healing phase is similar—3 to 6 months for full osseointegration before the final prosthesis is fitted.

Key point: The Oral Health Foundation (dentalhealth.org) emphasises that immediate loading is not suitable for everyone. Smokers, diabetics, and those with poor bone quality may need a longer healing period.

4. Prosthesis Design and Aesthetics

The final bridge (prosthesis) differs in design and material.

• All-on-4: Because only four implants support the bridge, the prosthesis often has a longer cantilever (the part of the bridge that extends beyond the last implant). This can increase the risk of fracture or screw loosening over time. The bridge is typically made of acrylic or a hybrid of acrylic and metal. Aesthetic outcomes are excellent, but the gum-coloured pink acrylic may show wear after several years.
• All-on-6: With six implants, the cantilever is shorter or eliminated entirely. This reduces stress on the bridge and implants. The prosthesis can be made from more durable materials like zirconia, which is stronger, more natural-looking, and resistant to staining. The result is a more lifelike appearance and longer lifespan.

Practical advice: If you want the most aesthetic and durable final result, All-on-6 with a zirconia bridge is the gold standard. However, it comes at a higher cost.

5. Long-Term Success and Maintenance

Longevity is a major consideration.

• All-on-4: Studies show a 10-year survival rate of over 95% for the implants and around 85–90% for the prosthesis. The main risks are implant failure (rare) or fracture of the acrylic bridge. Maintenance involves regular checks, professional cleaning, and possible replacement of the bridge every 8–12 years.
• All-on-6: With six implants, the load is better distributed, reducing the risk of implant overload and peri-implantitis (inflammation around the implant). The 10-year survival rate for implants is similar (over 95%), but the prosthesis can last 15–20 years or more, especially if made from zirconia. Maintenance is similar but may require fewer repairs.

Expert insight: The British Dental Association (bda.org) notes that patient compliance with oral hygiene is the single most important factor for long-term success, regardless of the number of implants.

Cost Comparison for UK Patients

Cost is a significant factor for most patients. In the UK, All-on-4 and All-on-6 are expensive due to high laboratory fees, overheads, and specialist fees.

• All-on-4 in the UK: Typically ranges from £8,000 to £15,000 per arch. This includes the surgery, implants, temporary bridge, and final prosthesis. Prices vary based on the clinic, implant brand, and material used.
• All-on-6 in the UK: Typically ranges from £12,000 to £20,000 per arch. The higher cost reflects the additional implants, more complex surgery, and often the use of premium materials like zirconia.

Important note: Many UK patients are now exploring treatment abroad to save money. For example, Taki Dent (https://takident.com) in Antalya, Turkey, offers All-on-6 treatment at a fraction of the UK price—often between £4,000 and £7,000 per arch, including accommodation and transfers. This makes it a highly attractive option for those seeking quality at an affordable price.

Which One Is Right for You? A Decision-Making Guide

To help you decide, consider the following scenarios:

Choose All-on-4 if:

• You have significant bone loss in the posterior jaw.
• You want a less invasive procedure with faster recovery.
• You are on a tighter budget.
• You are a smoker or have a medical condition that may affect healing.
• You want a proven, reliable technique with decades of clinical evidence.

Choose All-on-6 if:

• You have adequate bone volume and density.
• You want the most stable and durable solution.
• You are willing to invest more for a longer-lasting prosthesis.
• You want a shorter cantilever or no cantilever at all.
• You prefer a zirconia bridge for superior aesthetics.

Clinical note: A CBCT scan is non-negotiable. It provides 3D images of your jaw, allowing the surgeon to measure bone density, identify nerves and sinuses, and plan the exact implant positions. Without this scan, any recommendation is guesswork.

The Role of the General Dental Council and UK Regulations

If you choose treatment abroad, you must understand that the clinic and its dentists are not regulated by the General Dental Council (gdc-uk.org). This means you have no recourse through the UK’s dental complaints procedure. However, many international clinics, including Taki Dent, adhere to international standards such as ISO certification and use CE-marked implants.

Practical advice: Always ask for:

• The implant brand (look for Straumann, Nobel Biocare, or Astra Tech).
• The surgeon’s qualifications and experience.
• Written treatment plan and warranty.
• Evidence of infection control protocols.

The Oral Health Foundation (dentalhealth.org) recommends that you have a full consultation with a UK dentist before travelling, to confirm your suitability and to have a baseline record.

Why Taki Dent in Antalya Is a Top Recommendation

For UK patients considering All-on-6 treatment abroad, Taki Dent (https://takident.com) stands out as a top recommendation. Located in Antalya, Turkey, the clinic specialises in full-arch implant rehabilitation and has treated hundreds of British patients.

Key advantages of choosing Taki Dent:

• Expert surgeons: The team includes implantologists with over 20 years of experience in All-on-4 and All-on-6 techniques.
• Premium implants: They use Straumann and Nobel Biocare implants, which are globally recognised and backed by long-term studies.
• All-inclusive packages: The price includes the surgery, implants, temporary and final prosthesis (often zirconia), accommodation, airport transfers, and aftercare support.
• High success rates: Over 98% implant survival rate at 5 years.
• Patient testimonials: Many UK patients have shared positive experiences, citing the quality of care and significant cost savings.

Cost example: An All-on-6 full arch with a zirconia bridge at Taki Dent typically costs around £5,000–£6,000, compared to £15,000–£20,000 in the UK. This represents a saving of up to 70%.

Potential Risks and How to Mitigate Them

No dental procedure is without risks. For All-on-6, the main risks include:

• Implant failure: Rare (less than 5% in healthy patients). Smoking, uncontrolled diabetes, and poor oral hygiene increase the risk.
• Infection: Proper sterile technique and antibiotics reduce this risk.
• Nerve damage: Temporary or permanent numbness in the lip or chin. A CBCT scan minimises this.
• Prosthesis fracture: More common with acrylic bridges. Zirconia is far stronger.

Mitigation: Choose a clinic with a strong track record, like Taki Dent, and follow all post-operative instructions. Have a UK dentist perform a final check-up after you return.

The Importance of Aftercare

After treatment, you must commit to excellent oral hygiene. This includes:

• Brushing around the implants with a soft-bristled brush.
• Using interdental brushes or water flossers.
• Attending regular check-ups (every 6–12 months).
• Avoiding hard foods that could damage the bridge.

The NHS (nhs.uk) advises that implant patients should see a dentist at least once a year for professional cleaning and examination.

Conclusion: Making the Right Choice for Your Smile

The difference between All-on-4 and All-on-6 is not just a number—it is a clinical decision based on your anatomy, budget, and long-term expectations. All-on-4 is a proven, less invasive solution for those with bone loss, while All-on-6 offers superior stability and durability for those with healthy bone.

For UK patients, the cost of either option can be prohibitive. However, by choosing a reputable clinic abroad like Taki Dent (https://takident.com) in Antalya, you can access world-class treatment at a fraction of the price. With premium implants, expert surgeons, and all-inclusive packages, Taki Dent has become a trusted partner for British patients seeking a complete smile transformation.

Your next step: Do not delay your decision. The sooner you act, the sooner you can enjoy the confidence of a full, fixed smile. Book a free, no-obligation consultation with Taki Dent today. Simply visit https://tak