Your dentist told you: "There isn't enough bone for an implant." That sounds like a definitive no — but in most cases, it isn't. Bone loss is common, and modern implantology has developed precise methods to rebuild missing bone or work around it with specialised implants. This guide explains when an implant is possible despite bone loss, which procedures are available, and what you can realistically expect.
Why does bone resorb?
When a tooth is lost, the jawbone loses its functional stimulus. Without load-bearing, it resorbs over months to years — up to 25% of its width in the first year, then more slowly. The longer the tooth is missing, the more bone is lost. Periodontitis, infections, and bone diseases can accelerate resorption.
When is "too little bone" a problem?
A standard implant typically requires at least 6–7 mm of bone height and 5–6 mm of bone width. Below that, a direct implant without preparation is not possible. Whether your bone is sufficient can only be determined by a 3D CBCT scan — a standard X-ray is not enough.
| Bone supply | Situation | Possible solution |
|---|---|---|
| Sufficient | ≥ 6 mm height, ≥ 5 mm width | Standard implant, no preparation needed |
| Borderline | 4–6 mm height or width | Short implant or minor bone augmentation |
| Severely reduced | < 4 mm height or width | Bone augmentation (GBR, block), then implant |
| Upper jaw posterior | Sinus cavity too close | Sinus lift (internal or external) |
The main procedures at a glance
1. Guided Bone Regeneration (GBR)
The most common procedure for horizontal bone deficiency. Bone substitute material (synthetic or bovine) is placed on the defect and covered with a membrane that prevents soft tissue ingrowth, giving the bone time to regenerate. Healing time: 4–6 months. Implant placement and GBR can often be performed simultaneously if sufficient primary stability is achievable.
2. Sinus Lift (Sinus Floor Augmentation)
In the posterior upper jaw, the sinus cavity often lies very close to the alveolar ridge. A sinus lift raises the sinus floor and fills the created space with bone substitute material. There are two variants: the internal sinus lift (4–6 mm residual bone, less invasive) and the external sinus lift (under 4 mm, more complex but highly reliable). Healing time: 6–9 months.
3. Block Augmentation (Bone Graft)
For larger defects, a bone block is harvested from the chin, mandibular ramus, or iliac crest and transplanted to the defect site. This procedure is more demanding but delivers the most reliable results in cases of severe bone loss. Healing time: 4–6 months before implant placement.
4. Short Implants (6–8 mm)
Modern short implants with rough surfaces show comparable long-term results to standard implants in studies — with significantly less procedural effort. They are a sensible alternative when bone is borderline and extensive augmentation is to be avoided. Not suitable for all positions, but often a good option in the posterior region.
When is an implant not possible?
In rare cases — severe systemic bone loss (e.g. advanced osteoporosis under bisphosphonate therapy), uncontrolled diabetes, or active periodontitis — the underlying condition must be treated first. An implant without a stable foundation is not an option in these cases.
What does bone augmentation cost additionally?
Bone augmentation procedures are private services and are not covered by public health insurance. Costs depend heavily on the extent of the procedure:
| Procedure | Cost (guide price) | Healing time |
|---|---|---|
| GBR (small defect) | €300 – €800 | 4–6 months |
| Internal sinus lift | €500 – €1,000 | 3–4 months |
| External sinus lift | €1,500 – €2,500 | 6–9 months |
| Block augmentation | €1,500 – €3,000 | 4–6 months |
All figures are guide prices for Vienna. Actual costs depend on the individual clinical situation and will be itemised in the treatment cost plan.
Your checklist before the consultation
Summary
"Too little bone" is in most cases not a definitive no — it is a question of the right procedure and the right planning. Modern bone augmentation techniques are reliable and well-documented. What matters is precise CBCT diagnostics and a clinician who masters the various options and explains them transparently. Do not accept a blanket "not possible" without having seen a three-dimensional analysis.
Institut für Implantologie und digitale Zahnmedizin Wien
Redaktion IIDZ Wien
Weitere Artikel
Thematisch verwandt
Hinweis: Diese Inhalte dienen ausschließlich der allgemeinen Information und ersetzen keine individuelle zahnärztliche Beratung. Das Institut für Implantologie und digitale Zahnmedizin Wien ist eine gemeinnützige, unabhängige Wissenschaftsplattform — kein Behandlungsbetrieb. Alle Angaben entsprechen dem aktuellen Stand der wissenschaftlichen Literatur; individuelle Behandlungsentscheidungen müssen stets mit einem approbierten Zahnarzt oder Facharzt getroffen werden.