Journal of Dental Research, Vol 70, 1338-1345, Copyright © 1991 by International & American Associations for Dental Research Online Journals
The effect of partial coating with hydroxyapatite on bone remodeling in relation to porous-coated titanium-alloy dental implants in the dog
R. M. Pilliar, D. A. Deporter, P. A. Watson, M. Pharoah, M. Chipman, N. Valiquette, S. Carter and K. De Groot
Faculty of Dentistry, University of Toronto, Ontario, Canada.
For inhibition of crestal bone resorption due to stress shielding and
disuse atrophy, an hydroxyapatite (HA) plasma coating was added to the
coronal portion of partially porous-coated endosseous dental implants.
These implants, as well as control non-HA-coated implants were placed in
healed mandibular premolar extraction sites in dogs for a 72-week period of
function. Histological examination showed that both implant designs became
securely fixed by bone ingrowth into the porous-coated apical region of the
implants. The plasma-sprayed HA coating resulted in significantly greater
bone height formation and maintenance next to the coronal portion of the
implant compared with non-HA-coated implants of similar design. In
addition, significant resorption of the 20-to-50-microns-thick
plasma-sprayed HA coating occurred over the 18-month period of function.
