What's Behind the Surge in So-Called 'Atrophic' Implant Cases?

In practices, at conferences, on social media: when implants come up, nearly every case is “atrophic.” The word means a situation with little residual bone, where anchoring the implants becomes complex.

When I started out, I heard it far less. Sure, the low-bone case turned up now and then. But the focus was rarely on the quantity of residual bone, and patients were treated superbly — by distinguished colleagues and less distinguished ones alike.

Meanwhile a lot of time has passed, and implant surfaces have never been so refined, planning so precise, techniques so documented. Yet the share of cases we call “complex” or “atrophic” keeps climbing. The patients’ bone hasn’t changed. We have.

The truth is less comfortable than what gets said at courses, and for those in the field it is in plain sight.

Atrophy is mostly in the eye of the operator

How much bone does an implant really need? The answer changes from operator to operator. It is unavoidable: skill, hands, and experience are individual traits. The same thin ridge that one surgeon expands, another grafts, and a third declares inoperable. Atrophy, before it is in the bone, is in the perception of whoever is looking.

Onto this variability a technological race has grafted itself. With the spread of extra-maxillary implantology — zygomatic implants — and of CAD-designed subperiosteal “mesh” implants, the bar has shifted too. Cases that would resolve with far simpler regenerative methods end up candidates for the most imposing solution available. When you have the spectacular tool in the room, the temptation to find it a case is strong. And the word “atrophic” is what justifies it.

Periodontitis goes untreated

Periodontal disease is largely untreated, or treated badly.

If periodontitis is not cured, the patient loses bone and gum inexorably. It would be enough to go back to the basics of periodontology — periodontal surgery and prosthetics when they are needed — to save enormous amounts of precious bone, and with it many teeth.

And periodontal therapy has to be complete and definitive. Even partial therapy — scaling and root planing repeated over time, and little else — can turn out to be harmful. Dragging doubtful teeth along for months or years, with chronic abscesses, destroys the surrounding tissue: if they are not recoverable, keeping them is worse than losing them. In a periodontal patient treated late, placing implants becomes progressively harder — not through bad luck, but because time, on uncontrolled inflammation, always works against the bone.

Put bluntly: the molar that only “settles” after each professional hygiene session and then, little by little, starts bothering you again is not healed. Either you treat it properly and permanently, or you honestly consider extraction — before it takes the neighboring teeth’s bone with it. The atrophic ridge is almost always the last chapter of a periodontitis nobody stopped in time.

Immediate loading burns bone that never comes back

Immediate-loading techniques often involve flattening the residual bone, to make seating the implants simpler and “cleaner.” It sounds like a technical detail. It is not. That bone will never grow back.

One of the foundations of every regenerative technique is the concept of peaks. As long as higher points remain — of bone, of any supporting tissue — you can regenerate up to that height. Remove them, level the ridge, and you have closed the door: without peaks, regeneration becomes far more complex, often impossible. With a bur, in a few minutes, you destroy the anatomical premise of any future reconstruction.

Then there is the haste. In immediate loading done “at all costs,” many remaining teeth are often extracted in a single session. But the simultaneous extraction of many natural teeth is followed by heavy, hard-to-counter bone resorption. This is not opinion. Schropp and colleagues documented that after a single extraction the ridge loses about half its width in the first year, and much of it within the first three months. Tan’s systematic review quantified it across studies: horizontal loss of 29-63% and vertical loss of 11-22% at six months. Multiply that by a whole arch extracted in one afternoon — the kind of case that follows immediate loading.

And we even know how to slow it down. Avila-Ortiz’s meta-analysis shows that preserving the ridge at the moment of extraction saves roughly 2 millimeters of resorption compared with spontaneous healing. Millimeters we then spend months, and biomaterials, trying to put back. Whoever skips this step does not find atrophy: they prepare it.

The second wave: re-treatments

Here comes the part I watch grow year after year. Cases needing re-treatment after immediate loading are rising fast.

The arithmetic is brutal. If the patient has already undergone a technique that cuts down the bone levels to place the implants, that loss is permanent. And if peri-implantitis arrives afterward, to the bone removed by surgery is added the bone eaten by the disease.

And peri-implantitis is not rare: Derks and Tomasi, reviewing the literature, estimate a mean prevalence of 22% — with a detail that weighs more than all the others here, prevalence rises with years of function. The longer an implant is in the mouth, the more exposed it is.

When a case like this comes back, there is no bone left anywhere: not what the patient had, not what the bur flattened, not what peri-implantitis devoured. These are the most dramatic cases and the hardest to solve. And they all count, with full right this time, in the statistics of “atrophic cases.” Except that this atrophy is only partly attributable to the original disease: the rest is the result of the treatments chosen to cure it.

Too young, too soon

There is one last variable, the least discussed: age.

Full implant reconstruction should be deferred as late as possible in the patient’s life. Not out of vague caution, but out of arithmetic: if peri-implantitis rises with years of function, rehabilitating a fifty-year-old with a fixed arch means exposing them to decades of cumulative risk. A share of these patients will, in time, run into trouble. And if what I described above arrives — flattened bone plus peri-implantitis — quality of life can stay compromised for many years.

Cawood and Howell had already captured it in 1988: the edentulous ridge does not stand still, it slides from one resorption class to the next as edentulism drags on. We are recreating, in an iatrogenic and premature version, what good periodontology and conservative surgery had nearly made disappear. The “old folk” of the past are coming back.

When atrophy is real

I would be dishonest if I let you believe that zygomatic implants, mesh implants, and major regeneration are never needed.

Severe atrophy exists. There are jaws with no bone to preserve or expand, the aftermath of resections, multiple failures, terminal resorption. There the zygomatic implant is a blessing, the custom mesh is the right answer, the graft is the cure and not the excess. The problem is not the techniques. The problem is using them as a first choice on ridges that were not destined to become atrophic, and that a serious periodontal diagnosis or a simple ridge expansion would often have saved.

The one question to ask before writing “atrophic” on a chart: is this ridge really like that? Are there peaks? Can I regenerate rather than demolish? How old is the patient?

---

Questions

Are you saying colleagues ruin their patients? No. I am saying that time pressure, technological fashion, training, and incentives all push in the same direction, and that no bad faith is needed for the result to be the same: cases that turn atrophic along a course of care, not before it started. Most colleagues do in good faith what they were taught to do. The problem is upstream, in what is taught and rewarded.

Do you gain from criticizing immediate loading, zygomatics, and all-on-X? I practice periodontology and conservative surgery, so yes, I am biased. But the numbers are not mine. The 22% peri-implantitis figure is Derks and Tomasi’s, the 29-63% width lost after extraction is Tan’s, the 2 millimeters saved by preservation are Avila-Ortiz’s. Check them. Then decide.

Is immediate loading always wrong? No. In selected cases, with adequate bone and an honest diagnosis, it is an excellent technique. What is wrong is immediate loading “at all costs” as a default — the kind that extracts wholesale, levels the ridges, and defers the bill by ten years.

How do I avoid turning a patient into an “atrophic” one? Treat the periodontitis first, not later. Extract only what is truly unrecoverable, and when you extract, preserve the ridge. Do not flatten the peaks you would need to regenerate. And defer full rehabilitation as long as possible, instead of bringing it forward for convenience. The atrophy you do not create is the one you will not have to treat.

---

Three roads

You can keep treating atrophy as the patient’s starting condition, and equip yourself with the most imposing techniques to face it.

You can start asking, in front of every case, how much of that atrophy was already there and how much was produced by the road traveled up to you — the untreated periodontitis, the hurried extraction, the flattened ridge.

Or you can move the work upstream: care for the tissues while they last, preserve the bone while it is preservable, and discover how many of your future “atrophic” cases simply will not be born.

I am not asking you to believe me. I am showing you the numbers. You decide.

References

Schropp L, Wenzel A, Kostopoulos L, Karring T. Bone healing and soft tissue contour changes following single-tooth extraction: a clinical and radiographic 12-month prospective study. Int J Periodontics Restorative Dent. 2003;23(4):313-323. PMID: 12956475.

Tan WL, Wong TL, Wong MC, Lang NP. A systematic review of post-extractional alveolar hard and soft tissue dimensional changes in humans. Clin Oral Implants Res. 2012;23 Suppl 5:1-21. doi:10.1111/j.1600-0501.2011.02375.x. PMID: 22211303.

Avila-Ortiz G, Chambrone L, Vignoletti F. Effect of alveolar ridge preservation interventions following tooth extraction: a systematic review and meta-analysis. J Clin Periodontol. 2019;46 Suppl 21:195-223. doi:10.1111/jcpe.13057. PMID: 30623987.

Cawood JI, Howell RA. A classification of the edentulous jaws. Int J Oral Maxillofac Surg. 1988;17(4):232-236. doi:10.1016/s0901-5027(88)80047-x. PMID: 3139793.

Derks J, Tomasi C. Peri-implant health and disease. A systematic review of current epidemiology. J Clin Periodontol. 2015;42 Suppl 16:S158-171. doi:10.1111/jcpe.12334. PMID: 25495683.