Bone grafting & sinus lift surgery

Implants need bone. When bone has been lost — to extraction, gum disease, trauma or time — grafting rebuilds it, and in the posterior upper jaw the sinus lift creates height where the sinus has expanded into the ridge. This is reconstructive groundwork: unglamorous, and decisive.

Author: Dr. Barış Kipritoğlu, Oral & Maxillofacial Surgeon Reviewed: 7 August 2026 Verified credentials

Why bone disappears

Alveolar bone exists to hold teeth; remove the tooth and the bone remodels away — fastest in the first year after extraction. Periodontal disease, infection, trauma and long denture wear accelerate the loss. The result is a ridge too thin or too short for an implant in the position the prosthetics demand.

Grafting techniques

Guided bone regeneration (GBR): particulate graft protected by a membrane, for contained defects and contour augmentation — often simultaneous with implant placement.
Block grafting: a solid piece of the patient's own bone, typically harvested from the mandibular ramus or chin, fixed to the ridge for larger horizontal defects.
Socket preservation: grafting an extraction socket at the time of removal to slow collapse when an implant is planned later.
Sinus floor elevation: lateral-window technique for major height gains, or the crestal (osteotome/hydraulic) approach when only a few millimetres are needed.

Assessment and planning

The CBCT determines everything: defect geometry, residual ridge dimensions, sinus anatomy and membrane condition, and the position of vessels and nerves at donor and recipient sites. Planning decides not just the technique but the sequence — simultaneous versus staged — and the realistic volume gain, stated to the patient before consent.

Limits and risks

Graft healing depends on blood supply, stability and soft-tissue closure; smoking and uncontrolled diabetes work against all three. Complications include membrane exposure, infection, partial graft resorption, donor-site morbidity for block harvests and sinus membrane perforation in lift procedures. Some volume loss during healing is biological reality and is planned for — not a surprise.

Recovery

Expect swelling and restricted chewing at the surgical site for one to two weeks, with sutures out at 10–14 days. Sinus-lift patients avoid nose-blowing and pressure changes for a fortnight. Radiographic review confirms consolidation before the implant phase proceeds.

Common questions

Where does graft material come from?

Depending on the defect: the patient’s own bone (autogenous — for example from the ramus or chin), processed donor bone (allograft), animal-derived mineral (xenograft), synthetic substitutes, or combinations. Each has trade-offs in healing behaviour and volume stability; the choice is case-specific.

How long before implants can be placed after grafting?

Smaller defects are often grafted at the same time as implant placement. Larger reconstructions typically heal 4–9 months before implants go in. Sinus lifts fall either side of that line depending on residual bone height.

Is a sinus lift dangerous?

It is a well-established procedure with a long evidence base. The characteristic complication is a tear of the sinus membrane, which is usually managed during surgery; sinus infection afterwards is uncommon. Risk rises with complex sinus anatomy and prior sinus disease — which is why the CBCT is read before anything else.

Can grafting always create enough bone?

No. Grafting has biological limits, and in the severely resorbed upper jaw staged grafting can mean long timelines with uncertain gains. In those cases alternatives such as zygomatic implants may be more predictable — or the honest answer may be a removable solution.