Ceramic hydroxylapatite (HA) coating results in faster bony adaptation, no fibrous tissue seams, firmer implant-bone attachment, decreased healing time, higher tolerance of surgical inaccuracies and an inhibition of ion release from the metallic substrate. In oral implantology, placement of dental implants in fresh tooth extraction sites is difficult, due to non-precision sites available for the implant placement. Upon tooth extraction, a superior void is created while the apical implant portion may be firmly seated. In orthopaedics, osteoporotic patients may not have total bony support for primary hip or knee placement and non-precision conditions may exist along much of the attachment area of a revision joint replacement. In-vivo studies of precision and not precisely placed HA-coated implants show that HA on a metallic implant device provides a mechanism for compensation, somewhat, for absence of a precision interference fit of the implant within the bone site. The coating acts as a substrate for bony proliferation and provides compensation for lack of direct bone contact leading to osseo-integration associated with metallic devices.
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