Long-term retrospective studies on hydroxyapatite coated endosteal and subperiosteal implants.

This article reports a long-term retrospective study on hydroxyapatite-coated implants, which covers more than 6 years of clinical use. The authors discuss not only cylinder implants, but blade and subperiosteal implants as well. This study reveals that, for the time covered, a definite clinical advantage exists to coating implants with hydroxyapatite.