Retrospective cephalometric analysis of mandibular bone absorption under silicone rubber chin implants.

A longitudinal study was conducted on 85 patients who received silicone rubber implants to the chin. Over half of these patients were found to have some absorption of the bone beneath the implants, and much other information was obtained. There were no concomitant changes in the soft tissue profile in the patients who demonstrated bone absorption under their implants. It appeared that the bone absorption was less when the implant was placed over the hard bone of the lower part of the mandible, rather than higher or over alveolar bone.