Where Does the Bone Come From for a Bone Graft Procedure?

A bone graft of the jaw may be necessary before a dental implant can take place. An implant needs a sufficient amount of bone to bond with, but tooth loss can cause this to break down. Therefore, sometimes it is necessary to build the jawbone back up to protect the integrity of the implant.

Types of bone graft material

Material for a graft can be either natural or synthetic. Sometimes a surgeon harvests material from a patient's own bones, or it can also come from an outside source.

Xenograft

A xenograft involves material that comes from the bone of an animal. There are several animals from which xenograft material can be taken. Equine xenograft, taken from the bone of a horse, is a common graft material.

Microscopically, human bone and equine bone are very similar, making it a better match. As an added advantage, compared to human bone, equine bone dissolves more slowly. This helps to maintain the integrity of the graft and prevent it from failing. Equine bone xenograft may be used alone or mixed with human bone material.

Allograft

An allograft is any graft material that comes from an outside source other than an animal. Synthetic allograft is created artificially from materials that are similar to bone, such as collagen and certain proteins. Natural allograft comes from a human donor, typically a cadaver.

There is a greater risk of rejection with an allograft or a xenograft than with an autograft. An allograft may also take longer to form a bond with the existing jawbone. However, assuming that the procedure does take, allograft and xenograft only require one surgery each, while autograft requires two.

Autograft

An autograft is bone material that comes from another location in the human body. There is less chance of rejection with an autograft because it involves the patient's own cells, which the immune system should recognize and accept. However, an autograft does require a second surgical site to harvest the necessary bone material. This takes place in areas where the patient has some extra bone to spare, and where the graft can be harvested easily. The chin and the hip are frequent collection sites.

Reasons for bone grafting

Bone grafting is not always required prior to a dental implant procedure. However, it may be necessary if extensive bone loss has taken place. Bone loss is a gradual process that begins as soon as a tooth comes out. When a tooth is missing, the jaw no longer receives the same strengthening benefits from chewing. The alveolar bone forms the socket that supports the tooth. With no work to do when the tooth is missing, the socket starts to atrophy.

Conclusion

A successful dental implant requires strong bone with which to integrate. However, the missing tooth causes gradual loss of bone in the jaw. Though it takes time to become noticeable and problematic, bone loss begins immediately after the tooth goes missing. A dental bone graft can rebuild the bone so that it can properly support the implant. Autograft is bone material harvested directly from the patient, xenograft comes from an animal, and allograft comes from another outside source, either a human donor or artificially created synthetic material.

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