Reaction of Bone to Magnetic Implant

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Abstract
Alloys of Pt (76.5%) and Co (23.5%) were implanted in the alveolar crest bone in edentulous premolar areas of the mandible in dogs. A similar magnet was embedded in the intaglio surface of an acrylic splint. The magnetic attraction and the irritation of the acrylic splint caused atrophy of the overlying mucosa and the movement of the intrabony magnet into contact with the magnet in the splint as early as 72 hrs; the implanted magnet was completely removed in 2 wks. The bony vault was repaired by new bone apposition but separated from the moving magnet by a fibrous capsule. Two similar magnets embedded in the bone of the mandible in dogs were separated by 2 mm of bone. The magnet attraction caused resorption of the inter-magnetic bone permitting complete contact after one mo. A magnet compatible with tissue will move out from its bony vault when attracted by a similar magnet embedded in a denture flange. The force of magnetic attraction of implanted magnets may cause resorption of intervening bone.

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