The planning logic
Implant count is one part of a larger biomechanical and restorative design. A clinician evaluates bone distribution, implant position, prosthetic span, opposing bite, available restorative space, hygiene access and the condition of the jaw before deciding how many implants to use.
Why four implants can work
The All-on-4® concept strategically positions four implants to support a complete arch. Posterior implants may be angled in appropriate cases to use available bone and reduce cantilever. The protocol has published clinical history, but it is not automatically the best fit for every jaw.
Why a clinician may choose six implants
Six implant positions can provide a different distribution of support where anatomy allows. A clinician might prefer additional implants because of bone pattern, prosthetic design, patient factors or contingency planning. However, two extra implants also require adequate bone, safe spacing and additional surgical sites.
What happens if one implant fails?
The answer depends on timing, implant position, prosthetic design and whether the remaining implants can safely support the arch. Some cases may be redesigned or retreated; others require removal and healing before a new implant is considered. Ask how the clinic handles early integration failure and later mechanical or biologic complications.
Cost and maintenance
More implants may increase surgical and component costs, but price should not determine implant count. Long-term maintenance focuses on the health of every implant site, bridge design, screw or component integrity, hygiene and bite.
What to ask
- Why are you recommending four or six for me?
- What is the planned cantilever?
- How does the final bridge design change with the implant count?
- Would grafting change your recommendation?
- How does your plan handle an implant that does not integrate?
General education only. Implant number is a clinical decision that requires examination and imaging.