Onlay bone graft

Injerto oseo de aposición o injerto en onlay

After extracting a tooth, the bone in the toothless area can rapidly recede. This situation can complicate the fitting of implants in the area and even make it impossible.

In cases of too little bone, a little fragment can be grafted onto the existing bone to create a stable base and allow the implant to go ahead.

Areas from which bone is extracted

  • If the amount of bone to be extracted is relatively small, the best extraction areas are the chin and the area beneath the bottom molars.
  • If a large amount of bone is required, it can be taken from other areas, particularly the cranium and the iliac section of the pelvis.

Implanting bone

The extracted bone fragment is anchored using osteosynthesis screws.

For the bone to weld to the host bone, the waiting time is normally 4 months. After this time the implants can be fitted; this is also normally when the osteosynthesis screws are removed.

Tobacco and onlay grafts

In non-smoking patients, the graft success rate is high. However, in smokers numerous complications often occur, prompting many surgeons not to recommend the technique to these patients.

Effects of the operation

Like in all surgical operations, a bone graft can be followed by the appearance of an oedema, light haemorrhaging or bruising.

Whatever the case, it is essential to observe your surgeon’s medical prescription and advice.

More information

You can find more information in: Updated information on dental implants.