When an Implant Does Not Integrate: How It Is Recognised and What the Second Attempt Changes

Integration failure is uncommon — published success rates for well-planned implants sit above ninety-five per cent — but it is the outcome most people want explained before they agree to treatment, and the explanations tend to stop at "it is removed and replaced".

The more useful account covers three things: how it is actually recognised, why the removal is not the ordeal people imagine, and what is learnt from it that changes the second attempt. That last part is where most of the value sits.

Osseointegration is a direct structural connection between living bone and the implant surface, with no fibrous layer in between. Bone cells migrate onto the titanium, deposit new bone against it, and over months that bone matures and remodels. Our article on osseointegration at the cellular level describes the process.

When it does not happen, the body instead lays down a layer of fibrous connective tissue between implant and bone. The implant is held by soft tissue rather than fused to hard tissue. Functionally that is the difference between a post set in concrete and one set in rubber.

An integrated implant has no mobility. Not a little; none. Bone is not compressible and there is no ligament, so an integrated implant does not move at all under finger pressure.

This makes the diagnosis unusually clean. Any detectable mobility in an implant means integration has not occurred or has been lost. There is no borderline category.

Other signs support it:

• Percussion note. Tapping an integrated implant gives a crisp, high-pitched sound. A fibrous interface damps this to a dull thud.

• Radiographic appearance. A continuous dark line — a radiolucency — around the implant on a radiograph indicates fibrous tissue rather than bone contact.

• Resonance frequency measurement. A device that measures how the implant vibrates in the bone, giving a numerical stability value that can be tracked over time.

• Discomfort on loading or on pressure, which is not normal weeks after surgery.

• Persistent discharge or a sinus tract at the site, where infection is involved.

What is often striking is how little there is to feel. Many non-integrating implants do not hurt. Discomfort that persists beyond the first week or two, or that returns after settling, is a reason to be seen — but its absence is not reassurance. This is why review appointments exist and why stability is checked before a crown is fitted rather than assumed. Our article on knowing whether an implant is healing correctly covers the normal course.

Non-integration in the first weeks to months — before the implant is loaded — reflects a failure of the initial healing response. The common contributors:

Insufficient primary stability. An implant needs to be mechanically wedged in the bone at placement, tightly enough that it does not move while biology takes over. Soft bone, an over-prepared site or an unfavourable shape can leave it under-gripped. Our article on primary and secondary stability and our article on primary stability and long-term outcomes cover this.

Micromovement during healing. Movement above roughly 50 to 150 micrometres during the healing window drives fibrous repair instead of bone formation. Premature loading, a denture rubbing over the site or chewing through the area can all supply it. This is why the weeks two to four window — when mechanical grip has declined and new bone has not yet taken over — is treated carefully. Our article on healing in weeks two to four covers the dip.

Surgical heating of the bone. Bone cells die above about 47°C. Drilling without adequate irrigation, with worn drills, or too fast in dense bone, produces a zone of dead bone around the implant that cannot integrate.

Contamination or infection at placement, or bacteria persisting from an infection at the site.

Compromised host healing. Smoking is the largest modifiable factor. Uncontrolled diabetes, previous radiotherapy to the area, certain medications affecting bone turnover, and immunosuppression all reduce the biological capacity to form bone against the implant. Our article on implants for smokers covers the magnitude of the effect.

Poor bone quality or quantity at the site. Our article on factors influencing implant stability and our article on bone quality versus quantity cover the assessment.

This is distinct from late failure, which occurs after successful integration and is usually peri-implantitis or overload. Our article on early versus late implant failure sets out the difference, and our article on spotting early peri-implantitis covers the late pattern.

Because the implant is not fused to bone, taking it out is not a surgical excavation. It is usually unscrewed or gently lifted under local anaesthetic, often in a short appointment, with recovery comparable to a straightforward extraction. The fibrous tissue is cleaned away and the site is left to settle.

The disappointment is real; the procedure itself is generally not a significant event.

The socket left behind is larger than the original implant and the surrounding bone may be compromised, particularly if infection was involved.

Three broad paths follow, depending on what is found:

• Heal and reassess. The site is left to fill with bone for around two to four months, then re-evaluated with imaging.

• Graft at the time of removal, where a defect is present, followed by a longer healing period — often four to six months — before a second attempt. Our article on bone grafting before implants covers what this involves.

• Change the plan. Occasionally the honest conclusion is a different position, a different design, or a different restoration altogether — a bridge or a denture. Our article on choosing between implants, bridges and dentures covers the comparison.

This is the part worth asking about, because a second implant placed identically into an unchanged situation is a repeat of the experiment.

Depending on what the first failure indicated, the plan may change in several ways:

• A wider or longer implant, taking advantage of the healed site to gain more contact area.

• A modified site preparation protocol — under-preparing the osteotomy in soft bone to increase grip, or using a slower, cooler, more heavily irrigated technique in dense bone.

• A different surface or design, where surface characteristics influence early bone response. Our article on implant surface texture and integration covers this.

• A longer unloaded healing period, and no temporary restoration bearing on the site.

• A different position entirely, if the original site was anatomically marginal.

• Addressing the modifiable host factor — stopping smoking, improving glycaemic control, resolving gum disease, reviewing medication with the prescriber.

Second attempts have a somewhat lower published success rate than first attempts, which is honest to know, but the majority do integrate. Our article on whether a failed implant can be replaced successfully covers outcomes in more detail.

One further point worth raising: repeated failure at multiple sites in the same person is a recognised pattern and suggests a host factor rather than a technical one. That warrants a broader medical review rather than a third identical attempt.

• What did you find at removal — was there infection, or was the bone simply not responding?

• Was there a defect, and does it need grafting?

• How long before we can reassess?

• What will be done differently next time?

• Is there anything on my side that is contributing?

• How does this affect the overall fees and timeline?

The last is a fair question and a reasonable one to have clarified in writing at the outset, before treatment begins.

• Any mobility in an implant means integration has not occurred; integrated implants do not move at all.

• Many non-integrating implants produce few symptoms, which is why scheduled review matters.

• The main causes are insufficient primary stability, micromovement, surgical heating, infection and impaired host healing.

• Removal is usually a short, straightforward procedure because the implant is not fused to bone.

• The site is allowed to heal, often with grafting, for two to six months before a second attempt.

• The second attempt should differ from the first in size, protocol, timing or site — and address any modifiable host factor.

If you have concerns about how an implant is healing, or an implant has not integrated and you want to understand the options, an assessment can set out what is involved. You can contact our team or read about dental implants.

This article is provided for general information only and does not constitute dental or medical advice. Implant outcomes depend on individual clinical and medical circumstances. If you experience implant mobility, persistent pain, swelling or discharge, arrange prompt assessment.

Next review due: 11 August 2027