An "autograft" is a bone graft that is taken from another part of the same person that is having the grafting procedure. An intraoral Autograft means that a piece of bone is taken from somewhere in the mouth and grafted to the area of bone deficiency.
An "autograft" is a bone graft that is taken from another part of the same person that is having the grafting procedure. An extraoral Autograft, means that a piece of bone is taken from somewhere outside of the mouth and used to graft a large area in the mouth. The hip bone is often used as a source of bone when a large amount of bone is needed. Sometimes one of the ribs is also used.
Synthetics, also known as Alloplasts, are bone substitutes that are produced in the laboratory. These bone substitute materials may or may not remain in the body. Some remain and become part of the new bone, while others will dissolve, stimulating bone growth in the grafted area during their dissolution.
An "Allograft" means a graft that has been obtained outside of the body of the person that is having the grafting done. Human Allografts are human bone that is taken from one person (treated, sterilized and packaged) and then used as a bone graft material to be placed in another different person. An Alloplast is also an Allograft.
Xenografts are Allografts (meaning that they are not from the same person that the graft is being used for). The bone matter is also not from a human being but from another species. The most common Xenograft is a Bovine Xenograft. Meaning that the bone material is taken from a cow (treated sterilized and packaged of course).