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Bone graft, membranes, sinus lift


The bone graft is the best solution to the treatment of lengthy or non-healing bone defects.

The inflammations, periodontitis and cystsoftencause bone loss around the teeth and in the jawbones. There are more procedures to replace the missing bone. The site of the planned bone graft must be free from inflammation, pathologic tissues must be eliminated and bone walls are sterilized by laser.
Bone graft materials can be synthetic, patients bone from another part of the body, or their mixture can be applied as well. The osseo integration is a longer procedure; generally it takes 6-12 months, depending on the size of cavity. The procedure can be enhanced by soft laser therapy, by dosing vitamins, mineral supplements.


Bone grafting techniques


1. Bone grafting together with implantation


If there is a relatively short time between implantation and loading, only a minimal portion of the bone has been lost during the biological processes, due to unloading. In those cases only a minimal quantity of bone is to be replaced. Bone graft is made when inserting the implants. The microscopic structure of the new bone is deceptively similar to that of the human bone, and it is capable of fulfilling this function.


2. Bone graft prior to implantations – two steps technique

If there is a long time between the dental restoration and tooth extraction, tooth loss, generally severe bone loss is to be expected. In those cases such an important quantity of bone is to be replaced; that it cannot be made only with bone graft material from external sources (allograft), so patient’s own bone will also be used. The own bone is mixed with bone graft material. The site of the bone loss will be filled up with this mixture, and then fixed with a special membrane for the period of healing, osseo integration.


3. Sinus lift

The sinus is filling out the majority of the upper jawbone, above the premolar and molar teeth. When the molars are lost, the bone shrinks, because without teeth it is not loaded. Furthermore, the sinus cavity becomes wider by advancing age; therefore the bone wall of the sinus floor becomes thinner. To increase the height of the upper jaw, the method of sinus lift (or elevation) has been worked out. After filling the area with bone graft, in some months a stable bone structure builds up. This bone is suitable for the placement of dental implants. Nowadays this procedure is a routine.
When making this intervention, the lower sinus mucosa is lifted with some millimetres, and the resulting gap is filled with bone graft material.

When sinus lift is made?

Before placing an implant, if there is not sufficient bone.

Bone grafts, used for sinus lift:
  • Patient’s own bone
  • Bone from human donors (in Hungary its use hasn’t been spread)
  • Bone harvested from animals –one of the most popular bone grafts
  • Synthetic bone grafts –most widely used materials
Procedure of sinus lift:

The surgery is made in local anaesthesia, but it can be performed under general anaesthesia as well. After anaesthesia, incisions are made in the gum, to reach the bone. A window like opening will be cut into the bone, with special instruments. The inner surface of the bone is covered by the sinus mucosa. When the “bone window” is lifted upwards with some millimetres, the sinus mucous membrane also elevates, and the resulting gap is filled with bone graft material. This material increases bone thickness towards the sinus. Bone grafting and placement of implants can be performed in one session in case of minor bone atrophy. The integration of the bone graft and the implant (building into the organic system) takes place in the same time. The two steps technique is applied in case of major bone atrophies. The sinus mucous membrane is elevated in the first session, and then the implants are placed after bone regeneration. Bone regeneration takes 6-8 months. Crowns or bridges can be fitted onto the implants after healing. Even if you have missing teeth since a long time, and you want dental implants, there are options for you! Visit our dental clinic, and our oral-surgeon implantologist will inform you about the possibilities.