Bone grafting and sinus lift: when are they necessary?

Bone grafting and a sinus lift are needed when there is not enough healthy jawbone to hold a dental implant securely. A bone graft rebuilds width or height where the bone has shrunk; a sinus lift adds bone under the sinus above the upper back teeth. Only an examination with X-rays, often including a 3D scan, can tell.

Why there is sometimes not enough bone for an implant

A dental implant is a small screw-shaped post, usually made of titanium, that replaces the root of a missing tooth. To stay stable for many years, it needs to be fully surrounded by healthy bone, with enough height and width.

Bone can be missing for several reasons:

• after an extraction, the bone that held the tooth gradually shrinks, a process called resorption, which is usually fastest in the first months;
• gum disease (periodontitis) destroys the bone around teeth before they are lost;
• in the upper jaw, the sinus above the back teeth can expand downwards once those teeth are gone.

If an extraction is planned, ask whether the socket should be preserved; our article on the difference between simple and surgical extractions explains why some extractions are more involved.

Bone grafting: what it is and the main types

Bone grafting means adding bone, or a material that behaves like bone, where the jaw is lacking. The graft works as a scaffold: over the following months, your own bone grows into it and gradually incorporates it.

The main graft materials are:

• your own bone (autograft), usually from elsewhere in the jaw;
• processed bone from a human donor (allograft), from a tissue bank;
• processed bone of animal origin (xenograft), most often bovine;
• synthetic bone substitutes (alloplasts).

Small defects are often grafted at the same time as the implant is placed. A socket graft, also called socket preservation, is placed straight after an extraction to limit shrinkage. Larger defects may need a separate grafting procedure first, with the implant placed several months later.

Sinus lift: what it is and when it is needed

The maxillary sinuses are air-filled spaces in the cheekbones, sitting just above the roots of the upper back teeth. After these teeth are lost, the bone below the sinus often shrinks and the sinus can enlarge downwards, leaving only a thin layer of bone.

A sinus lift, also called sinus augmentation, gently raises the thin membrane lining the floor of the sinus and places graft material underneath. There are two main approaches:

• the crestal (internal) approach: when a moderate amount of bone remains, the sinus floor is lifted through the same small opening used for the implant, which is often placed in the same visit;
• the lateral window approach: when very little bone remains, a small window is made in the side wall of the sinus to place more graft material.

How the procedure goes, step by step

1. Assessment: an examination, X-rays and often a 3D scan (cone-beam CT) to measure the bone and check the sinus; your medical history and medicines are also reviewed.
2. The procedure: the gum is opened, the graft or sinus lift is performed, and the area is closed with stitches. A small graft may add only a few minutes to implant surgery; a separate graft or a lateral sinus lift often takes around an hour, sometimes longer.
3. Check-up and stitch removal: usually after about one to two weeks.
4. Healing: the graft usually needs several months to mature, often around four to six months and sometimes longer for larger grafts or a sinus lift, before the implant is placed or a crown is fitted.

For the whole implant journey, see our complete patient guide to dental implants.

Pain, recovery and aftercare

Because the area is numbed with local anaesthesia (you stay awake), most patients feel pressure and vibration rather than pain during the procedure. Afterwards, soreness, swelling and sometimes bruising on the cheek are common. They usually peak around the second or third day and ease within a week or so. Ordinary painkillers recommended by your dentist are usually enough, and antibiotics or a mouthwash may be prescribed.

Our article on whether dental implants are painful describes each stage in detail. After grafting or a sinus lift, these simple measures help healing:

• eat soft food and chew on the other side;
• avoid smoking, which clearly reduces the chance of a graft healing well;
• after a sinus lift, avoid blowing your nose and sneeze with your mouth open for about two weeks, and avoid flying, diving and heavy lifting until your dentist says it is safe.

Contact the clinic if pain or swelling worsens after the third day, or if you notice fever, pus or a persistent bad taste.

Risks, suitability and alternatives

Grafts heal well in most cases, but like any surgery they carry some risks. Possible complications include infection, exposure of the membrane or graft, part of the graft not integrating and, for a sinus lift, a tear in the sinus membrane or sinusitis.

A different plan may be needed if you smoke, have poorly controlled diabetes or active sinus problems, have had radiotherapy to the jaw, or take certain medicines for osteoporosis or cancer that affect bone healing.

Depending on the situation, alternatives may include shorter or angled implants, a dental bridge supported by neighbouring teeth, or a removable denture. Once a graft has healed and integrated, it behaves much like natural bone and can support an implant for many years, provided you keep good oral hygiene, attend regular check-ups and avoid smoking.

What determines the cost

The cost depends on how much bone is needed, the type of graft material and membrane, whether a sinus lift is required, whether grafting is done with the implant or separately, the imaging required, and the implant and crown planned afterwards. A reliable estimate is only possible after an examination and X-rays at a consultation.

Bone grafting and implants at Ajam Dental Clinic in Tripoli

Ajam Dental Clinic is a dental practice on Fouad Chehab Boulevard, run by Dr. Abdel Rahman Ajam and Dr. Soumaya Ajam. Dental implants are among the treatments offered, together with oral surgery and extractions. Patients come to our clinic from across Tripoli — El Mina, Abu Samra, Al-Tall, Zahriyeh and Bahsas — as well as from Qalamoun and the rest of North Lebanon.

At your consultation, we examine you, review your X-rays and explain clearly whether you have enough bone for an implant, whether grafting or a sinus lift might be needed, and what the alternatives are. To book, contact us by WhatsApp or phone.

This article provides general information for patients. It does not replace an examination by a dentist, who can advise you on your own situation.