title: Strengthening of bone-implant interface by the use of granule coatings on alumina ceramics.
abstract: Three different granule coatings (a granular alumina ceramic coating, a granular hydroxyapatite coating, and a polished granular hydroxyapatite coating) applied to alumina ceramic substrate were evaluated for their strengthening effects of the bone-implant interface in rabbit tibiae. For a comparison, noncoated alumina ceramics, and dense hydroxyapatite were assessed in the same way. The granular alumina ceramic coating, creating a bioinert, porous surface, was most effective due to a strong mechanical bond between the bone and implant. The interface strength was even higher than that of the dense hydroxyapatite. The granular hydroxyapatite coating, creating a bioactive, porous surface, was less effective than the granular alumina ceramic coating because of the brittleness of the hydroxyapatite granules, although it formed a direct and mechanical bond with bone tissue. The polished granular hydroxyapatite coating, creating a bioactive, smooth surface, was least effective because of the brittleness of the hydroxyapatite granules, though it presented an improved interface strength compared with that of the noncoated alumina ceramics due to a direct bond between the bone and hydroxyapatite granules.
authors.affiliation: Department of Orthopaedic Surgery, Faculty of Medicine, Kyoto University, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Kakutani
authors.forename: T
authors.initials: T
authors.lastname: Yamamuro
authors.forename: T
authors.initials: T
authors.lastname: Nakamura
authors.forename: Y
authors.initials: Y
authors.lastname: Kotoura
mesh_terms: D000535:Aluminum; D000537:Aluminum Oxide; D001672:Biocompatible Materials; D001842:Bone and Bones; D002516:Ceramics; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D019736:Prostheses and Implants
chemical_list: D001672:Biocompatible Materials; D000535:Aluminum; D000537:Aluminum Oxide