How Long Do Dental Implants Last?

The honest answer is a number with a definition attached, because “lasting” means two different things in the research and patients are usually quoted the more flattering one.

Survival or Success: Which Number Is Being Quoted?

Survival means the implant is still in the jaw. It counts an implant that is in place but surrounded by inflamed tissue and has lost a third of its supporting bone.

Success is stricter. The criteria most often used, set out by Albrektsson and colleagues in 1986, require the implant to be immobile, free of any radiolucency around it on X-ray, free of persistent pain or infection, and losing no more than about 0.2 millimeters of bone per year after the first year of function.

Survival numbers are always higher than success numbers, sometimes by a wide margin. When a figure above 98 percent appears in an advertisement, it is almost certainly survival, and probably over five years rather than twenty.

What Do the Long-Term Studies Actually Show?

The literature is large and reasonably consistent.

Meta-analyses restricted to studies with at least ten years of follow-up report implant survival in the mid-nineties. Moraschini and colleagues, pooling studies of at least a decade, found mean survival of about 94.6 percent. A later meta-analysis by Howe and colleagues put ten-year survival at 96.4 percent, and at 93.2 percent in a sensitivity analysis the authors themselves describe as more realistic because it accounts for patients lost to follow-up. The lower of those two is the one worth planning around. For single crowns specifically, a systematic review by Jung and colleagues reports implant survival of 97.2 percent at five years and 95.2 percent at ten.

Beyond twenty years the data thin out. The long-running cohorts that exist, mostly from Scandinavian centers, were treated with older implant surfaces and older protocols than are used now, and they vary widely between studies and populations. Anyone who states a confident thirty-year figure is extrapolating.

So: a well-placed implant in a maintained mouth very often lasts decades. That is a different sentence from a promise that any particular implant will, and the difference matters.

Why Does the Crown Wear Out Before the Implant?

Because the two parts do different jobs and are made of different things. The implant is titanium in bone, protected from the mouth. The crown is ceramic in the open, chewed on several hundred times a day, and held by a small screw.

In the same review by Jung and colleagues, the crowns themselves survived at 96.3 percent over five years and 89.4 percent over ten, below the implants beneath them, with screw loosening in 8.8 percent, loss of retention in 4.1 percent, and fracture of the veneering ceramic in 3.5 percent over five years. Those rates climb with time, so that by ten years a meaningful minority of restorations have needed some repair or remake.

In practice this means the likeliest future for a successful implant is not failure but maintenance of the tooth on top: a screw retightened, a chip polished, a crown remade after many years. The implant underneath usually stays. Patients who grind are the most likely to need this soonest.

What Is Early Failure, and Why Does It Happen?

Early failure means the implant never integrated, or integrated and then let go within roughly the first year. It is uncommon, and it has its own causes, which are almost entirely surgical and biological rather than about how the implant is used.

The usual ones are poor initial stability in soft bone, overheating of the bone during preparation, bacterial contamination of the site, a graft that did not consolidate, and smoking. Early failure tends to announce itself: the implant becomes loose, or it remains tender in a way that does not settle.

Early failure is the more forgiving kind. The implant is removed, which is usually simple because it is not integrated, the site is grafted, and after a few months of healing another implant is placed. The site is frequently better prepared the second time.

What Causes an Implant to Fail Years Later?

Late failure is a different problem with a different cause, and the leading one is peri-implantitis: inflammation of the gum around an implant that has progressed into the bone supporting it.

The prevalence is higher than most patients expect. A meta-analysis by Derks and Tomasi found peri-implant mucositis, the reversible gum-level stage, in roughly 43 percent of patients with implants, and peri-implantitis, the stage involving bone loss, in roughly 22 percent.

The factors with the strongest evidence behind them are a history of periodontitis, poor plaque control, and no regular maintenance after the implant is placed. Cement left beneath the gum when the crown was delivered and an implant positioned so that it cannot be cleaned are linked to it on more limited evidence, and the review prepared for the 2017 World Workshop found the data identifying smoking and diabetes as risk factors inconclusive, which is worth saying because both are usually presented as settled. The quiet part is that peri-implantitis usually does not hurt. There is no nerve in an implant, so the warning signs are bleeding when the area is cleaned, a change in the gum contour, and bone loss on an X-ray, none of which a patient is likely to notice alone.

Occlusal overload, untreated grinding, and, rarely, fracture of the implant itself account for most of the remainder. Problems with an existing implant covers how each is treated.

What Does Maintenance Actually Prevent?

Mostly that 22 percent, and the evidence on this point is better than the evidence for a lot of what is claimed in dentistry. In a five-year follow-up by Costa and colleagues of patients who already had gum-level inflammation around an implant, peri-implantitis developed in 18 percent of those who kept preventive maintenance and 43.9 percent of those who did not. A later systematic review by Monje and colleagues found that the interval between maintenance visits influenced how often peri-implantitis occurred, and recommended a recall of at least every five to six months.

What a maintenance visit does for an implant is specific. Every implant is probed and the bleeding points recorded, the tissue contour is compared with the last visit, X-rays are taken at intervals to measure bone level against the baseline film from the day the crown went on, and the crown and abutment screw are checked. The whole point is to find a two-millimeter change while it is still two millimeters. What periodontal maintenance means explains the schedule and why visits alternate between the periodontist and the general dentist.

What maintenance does not prevent is worth saying too. It does not fix an implant placed in the wrong position, it does not undo cement left under the gum years ago, and it does not compensate for continued heavy smoking. It also cannot make a patient floss.

What Happens If an Implant Fails?

Caught at the mucositis stage, cleaning and better home care usually resolve it. Caught with early bone loss, decontamination of the implant surface and sometimes a regenerative graft can stabilize it, though bone that is lost is not reliably regained. Caught late, with most of the supporting bone gone, the implant is removed.

Removal is not the disaster patients fear. The implant comes out, the defect is grafted, and after three to six months of healing the site is usually able to take a new implant. Sometimes the better answer the second time is a bridge or a different design, and Dr. Verrett will say so if that is the case. Bone grafting covers the rebuilding step, and replacing a single tooth and full-arch options cover what can go back.

What the Practice Does When One Fails

Stated plainly: an implant placed by Dr. Verrett that fails early, meaning it does not integrate or is lost within the first year, is removed and replaced at no surgical cost once the site is ready. Grafting associated with that replacement is included. The patient’s own dentist handles the crown, and that part sits between the patient and that office.

Failures years later are evaluated case by case, because the causes are different. An implant lost to peri-implantitis in a patient who kept every maintenance visit is a different conversation from one lost after four years away, and both are conversations the office is willing to have in person rather than by policy.

This is a statement of what the practice does, not a prediction about any individual implant. Some failed sites should not be retreated, and saying so is part of the job.

The Short Version

An implant is among the most durable things dentistry offers, with survival in the mid-nineties at ten years across a large body of research. The crown on it has a shorter working life. The largest threat to the implant itself is a silent inflammatory disease that a probe and a periodic X-ray will find early and that nothing else will.

Austin Periodontal Associates checks every implant it places, for as long as the patient keeps coming, and treats the gum disease that predicts trouble around implants. Dental implants covers placement, sinus lift covers the upper back jaw, gum disease treatment covers the condition underneath most late failures, and a consult in North Austin can be requested here.