Bone grafts, sinus lift 2017-09-23T15:43:31+00:00

Bone grafts, sinus lift

Bone graft and sinus lift might be necessary before the placement of implants in case of loss of alveolar ridge.

Bone grafts are needed if the alveolar ridge is partially or totally lost. The substitution of bone can be made using different materials: own bone, human bone, bovin bone and synthetic bone. They are available as granulates and blocks in different sizes. The gold standard of bone grafting is the own bone of the patients. This type of grafting gives the best results and it is the cheapest, but the disadvantage of this method is the operation both at the donor and recipient site. Therefore other methods are more popular. To facilitate the integration of the graft, special proteins can be used.

Sinus lift is a special case of bone grafting. This treatment creates more bone mass at the bottom of maxillary sinus contributing to the stability of the implant. By using this method implants can be palced into the molar molar area.

Sinus lift sablonos ábrázolása

Before sinus lift

Sinus lift sablonos ábrázolása

After sinus lift

Osteointegration

The healing of the bone around the implant varies depending on the quality of bone. It takes 2-3 months on average in the lower jaw and 4-6 months in the upper jaw. The initial stability of the implant is decreasing during the first two weeks following implantation because the osteoclastic activity (bone resorption) is more intense than the osteoblastic activity (bone building). After this two week period the process is the opposite, faster osteoblastic activity, slower osteoclastic activity. In the final third of the healing process the unorganic hard bone minerals will integrate into the bone.

Histological image of bone integration

Different techniques of bone grafting

If the patient does not need bone harvesting extraorally, there is no need for general anaesthesia. If that is needed the operation will be carried out under general anaesthesia, requiring at least an overnight hospitalisation. The typical donor site is the anterior iliac crest (hip bone). The harvested bone will be stabilised by screws at the recipient site. Though the  cells of the donor bone block will lose vitality due to lack of circulation, the bone structure functioning as a scaffold enhances the integration of the own bone.

Regardless of the method of anaesthesia the surgical treatment is completed without causing pain for the patient. In both cases after the operation the area can be sore and swollen which can be easily controlled by painkillers. Sometimes a few days of sick leave could be indicated. The size of the grafted bone is slightly reduced during the healing period by bone transformation. Ultimately, the graft becomes identical in structure to the surrounding recipient area.

The treatment of numerous patients are rejected by clinics with less experience in bone grafting. The reason behind that is likely due to the thin bucco-linqual aveolar processus (bone ridge). Patient with this type of  problem can be treated using ridge splitting, sandwich bone grafting and implant setting or with lateral augmentation and gingivoplasty.

After a six month healing period the implants can be inserted into the grafted site. The final integration of the implants takes a further four month.

Sinus lift sablonos ábrázolása

Bone graft, sinus lift with bone harvested from the iliac crestal (hip bone), before implantation

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