194 Theories and techniques of oral implantology

Fig. 5-112. A long-term successful case of magnetized implants. A, After 3 years the magnet is still firmly seated into the bony site, showing no adverse effects. B, Seven and one-half years later the case is still successful. Inset, a close-up of B. (From Behrman, S. J.: Implantation of magnets in jaw to aid retention, J. Prosth. Dent. 10:807-841, 1960.)

Tooth transplantation

For many years various practitioners have tried transplanting teeth, that is, replacing lost teeth with other natural teeth. If the donor and recipient are the same species, the transplantation is homogenous. If the same individual uses one of his own teeth to replace another he has lost, such as placing an extracted impacted wisdom tooth into the site of a missing 6-year molar, the transplantation is an autogenous one. If the donor and the recipient are of different species, such as a monkey and a human, the transplantation is heterogenous.

Classifications also relate the anatomic origin of the donated tooth and the location of the transplant site. The orthotopic transplant is placed in its normal location in the recipient's dental arch. In an isotopic transplantation, on the other hand, the donated tooth is placed somewhere in the dental arch, but not in its customary location. When the trans-planted tooth is placed in an abnormal anatomic location, such as a tooth transplant in the anterior eye chamber, the transplant is heterotopic. According to Longmire, transplants can also be classified according to the vitality exhibited by each one. The