What Are All-on-6 Dental Implants?
📋 What You'll Learn
All-on-6 is a dental implant technique that replaces an entire arch of teeth using six strategically placed implants rather than the four used in All-on-4. While the core concept is similar—providing a full set of fixed teeth supported by multiple implants—the additional two implants offer increased stability and may be recommended in specific situations.
This article explains how All-on-6 works, how it differs from All-on-4, the advantages of using six implants instead of four, and which patients benefit most from this approach.
Quick Reference
| Aspect | All-on-6 Details |
|---|---|
| Number of Implants | 6 per arch (upper or lower) |
| Number of Teeth Replaced | 10-14 teeth per arch |
| Typical Timeline | Same day to 6 months |
| UK Cost Per Arch | £10,000-£18,000 |
| Success Rate | 96-99% over 10 years |
Understanding All-on-6
All-on-6 follows the same fundamental principle as All-on-4 but uses six implants instead of four to support a full arch of replacement teeth.
The Basic Configuration
A typical All-on-6 arrangement includes:
- Two implants at the front of the jaw (similar to All-on-4)
- Four implants in the middle and back regions (two more than All-on-4)
- A custom bridge attached to all six implants
The six implants work together to distribute chewing forces across a wider area, providing enhanced stability and support.
Development of All-on-6
While All-on-4 was designed as the minimum number of implants needed for full-arch restoration, clinical experience showed that adding two more implants in the middle region:
- Improved force distribution
- Increased long-term success rates
- Provided backup if one implant develops problems
- Better suited certain anatomical situations
All-on-6 emerged as a refinement for patients with adequate bone or those wanting maximum stability.
How All-on-6 Differs from All-on-4
Understanding the key differences helps explain when six implants are worth the additional investment.
Implant Placement Pattern
All-on-4:
- Two front implants placed vertically
- Two back implants angled at 30-45 degrees
- Implants positioned at the front and far back only
All-on-6:
- Two front implants placed vertically
- Two middle implants placed vertically or slightly angled
- Two back implants angled (often less severely than All-on-4)
- Implants distributed more evenly across the arch
Force Distribution
All-on-4:
- Four implants support entire arch
- Each implant bears approximately 25% of chewing forces
- Back implants experience higher stress due to angling
All-on-6:
- Six implants support entire arch
- Each implant bears approximately 16% of chewing forces
- More even force distribution
- Reduced stress on individual implants
Bone Requirements
All-on-4:
- Designed to work with minimal bone
- Angled back implants avoid anatomical structures
- Often possible without bone grafting
All-on-6:
- Requires more available bone
- Additional middle implants need adequate vertical space
- May require bone grafting more frequently
- Not always possible in severely resorbed jaws
Cost Comparison
All-on-4:
- £8,000-£15,000 per arch
- Four implants included
- Standard treatment approach
All-on-6:
- £10,000-£18,000 per arch
- Six implants included
- Additional £2,000-3,000 for extra implants
- More complex bridge fabrication
Advantages of All-on-6
The additional two implants provide several benefits that may justify the extra cost.
Enhanced Stability
- Better resistance to lateral forces
- Improved stability for immediate loading
- Less micromovement during healing
- More secure feeling for patient
Superior Force Distribution
- Each implant experiences less stress (16% vs 25%)
- Reduced risk of individual implant overload
- Lower mechanical complication rate
- Potentially longer implant lifespan
Redundancy and Backup
- If one implant develops problems, five remain
- Bridge can continue functioning with five implants
- Less catastrophic if early failure occurs
Higher Success Rates
- All-on-4: 94-96% success at 10 years
- All-on-6: 96-99% success at 10 years
- 2-3% improvement for maximum predictability
When All-on-6 Is Recommended
Dentists typically recommend six implants over four in specific situations.
Patient Factors
- Strong bite force: Heavy chewers, strong jaw muscles, history of breaking dental work
- Higher BMI: Increased body weight correlates with higher bite forces
- Bruxism: Teeth grinding creates increased forces even with night guard
- Active lifestyle: Athletes, people who talk extensively, maximum confidence needed
Anatomical Factors
- Adequate bone available: Sufficient width and height for six implants
- Wide arch: Naturally wider jaws benefit from more distribution points
- Uneven bone quality: Variable density compensated by additional implants
The All-on-6 Procedure
The treatment process is similar to All-on-4 but involves placing two additional implants.
Initial Assessment
- CT scan to assess bone at six sites
- More complex digital planning
- Verification adequate bone exists
Surgical Procedure
- Takes 2.5-4 hours (vs 2-3 for All-on-4)
- Six implants placed instead of four
- Immediate loading often possible
- Generally more stable than All-on-4
All-on-6 vs All-on-4: Making the Decision
Choose All-on-4 When:
- ✓ Bone is limited
- ✓ Budget is primary concern
- ✓ Bone grafting must be avoided
- ✓ Lighter bite force
- ✓ Standard success rate acceptable
Choose All-on-6 When:
- ✓ Adequate bone available
- ✓ Budget allows optimal treatment
- ✓ Heavy chewer/strong bite
- ✓ Maximum stability desired
- ✓ History of bruxism
- ✓ Highest success rate wanted
The additional cost of All-on-6 (£2,000-3,000 more per arch) buys 2-3% improved success rate, better force distribution, and peace of mind from redundancy.
Maintenance Requirements
All-on-6 maintenance is similar to All-on-4:
- Daily cleaning: 15-20 minutes with water flosser and interdental brushes
- Professional check-ups every 3-4 months
- Annual cost: £300-500 for maintenance
- Bridge replacement every 10-15 years
Success Rates and Complications
Short-Term (1 Year)
- Immediate loading: 97-99%
- Delayed loading: 99%+
Long-Term (10+ Years)
- Overall: 96-99% still functioning
- Lower jaw: 97-99%
- Upper jaw: 95-98%
Cost Breakdown
Typical All-on-6 Package (Per Arch)
- Comprehensive examination and CT scan
- Digital planning with six implants
- Extraction of remaining teeth
- Placement of six implants
- Temporary bridge (if immediate loading)
- Final custom bridge
- First year follow-ups
Total: £10,000-£18,000
Cost Comparison Table
| Component | All-on-4 | All-on-6 |
|---|---|---|
| Base treatment | £8,000-£15,000 | £10,000-£18,000 |
| Per implant cost | £2,000-£3,750 | £1,667-£3,000 |
| Difference | - | +£2,000-£3,000 |
All-on-6 vs Other Full-Arch Options
All-on-6 vs All-on-8
All-on-8:
- 8 implants per arch
- Cost: £15,000-25,000
- Highest stability
- Requires excellent bone
All-on-6:
- More economical
- Excellent stability
- Better cost-benefit ratio
- Suitable for more patients
Conclusion
All-on-6 dental implants represent a middle ground between the economical All-on-4 approach and the more extensive option of individual implants for each tooth. Using six strategically placed implants to support a full arch, All-on-6 offers enhanced stability, better force distribution, and higher long-term success rates (96-99%).
While it costs £2,000-3,000 more per arch than All-on-4, this represents only a 15-20% increase in cost for measurably better outcomes. For patients who have adequate bone, can afford the difference, and want maximum stability, All-on-6 represents an excellent option.
The decision between All-on-4 and All-on-6 should be made in consultation with an experienced implant dentist who can assess individual bone quality, bite force, and personal needs to recommend the most appropriate option.
Key Takeaways
- All-on-6 uses 6 implants per arch instead of 4 for full arch restoration
- Provides better force distribution with each implant bearing ~16% vs 25% of forces
- Success rate of 96-99% over 10 years, slightly better than All-on-4
- Costs £10,000-£18,000 per arch (£2,000-3,000 more than All-on-4)
- Recommended for heavy chewers, bruxism, or when maximum stability desired
- Requires more available bone than All-on-4
- Provides redundancy—if one implant fails, five remain to support bridge
- Best for patients wanting optimal outcomes and who have adequate bone
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