Rigid endosseous implant utilized as anchorage to protract molars and close an atrophic extraction site
Abstract
A two-stage endosseous implant, placed in the retromolar area of the mandible, was utilized as rigid anchorage to translate two molars 10–12 millimeters mesially into an atrophic endentulous ridge. Despite substantial anchorage demand over a three year period, the endosseous implant remained rigid (“osseointegrated”). At the end of treatment the implant and adjacent, intravitally labeled bone were recovered. Microradiographic and polarized light analyses revealed that about 80 percent of the endosseous portion of the implant was in direct contact with mature lamellar bone. Bone labels demonstrated a remarkably high remodeling rate (about 30 percent/year) for cortical bone within 0.5 millimeter of the interface. Continuous remodeling may be the long-term mechanism whereby loaded implants resist bone fatigue and maintain “osseointegration.” Clinical use of orthodontic implants, placed outside the dental arches, requires careful attention to soft tissue management.
This paper was presented at the Biennial Meeting of the Edward H. Angle Society, September 13, 1989 in Chicago, IL.
Contributor Notes
W.E. Roberts is Professor and Chairman of the Department of Orthodontics at Indiana University, School of Dentistry, lndian-apolis, IN. He is also Professor of Physiology and Biophysics, School of Medicine, Indiana University in Indianapolis, IN, and Associate Professor of Oral and Maxillofacial Surgery, University of Lille in Lille, France. Education qualificafions are a DDS degree from Creighton University, PhD in Anatomy from the University of Utah and a Certificate in Orthodontics from the University of Connecticut. At the time the present case was treated, Dr. Roberts was Professor of Orthodontics at the University of the Pacific, School of Dentistry, San Francisco, CA. He is still a Research Associate at that institution
K.J. Marshall is Associate Professor and Chairman of the Department of Oral and Maxillofacial Surcyry, University of Pacific, School of Dentistry, San Francisco. His dental degree is from the same institution. Oral and Maxillofacial Surgery residency was in the U.S. Army
P.G. Mozsary is in private practice of oral and maxillofacial surgery in Vallejo, CA. Dental degree, basic medical training (MUDR) and certification in oral and maxillofacial surgey are from Semmelweis University in Budapest, Hungary