title: Rapid bone resorption adjacent to hydroxyapatite-coated implants.
abstract: This paper describes rapid bone resorption in the peri-implantitis of HA implants based on both our clinical observations of and histological research on extracted dense hydroxyapatite (HA) implants. The surfaces of extracted HA implants were rough, although they were smooth at fixture placement. Plaque formed on the necks of the implants, whereas little plaque was seen on the bottoms. The plaque consisted of cocci and rods, including filamentous bacteria. Few spirochetes were observed. Although surrounding bone was formed rapidly around the HA implant, bone thickness gradually decreased compared with the titanium implant. These facts suggest that the rigid biointegration of HA with the thin surrounding bone--that is, the overstressing of the bone--causes rapid bone resorption rather than plaque accumulation on HA.
authors.affiliation: Tokushima University School of Dentistry, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Ichikawa
authors.forename: K
authors.initials: K
authors.lastname: Hirota
authors.forename: H
authors.initials: H
authors.lastname: Kanitani
authors.forename: R
authors.initials: R
authors.lastname: Wigianto
authors.forename: N
authors.initials: N
authors.lastname: Kawamoto
authors.forename: N
authors.initials: N
authors.lastname: Matsumoto
authors.forename: Y
authors.initials: Y
authors.lastname: Miyake
mesh_terms: D000328:Adult; D016301:Alveolar Bone Loss / Q000209:etiology* / Q000473:pathology; D015921:Dental Implants / Q000009:adverse effects*; D003773:Dental Plaque / Q000382:microbiology; D017267:Dental Prosthesis Design; D019232:Dental Restoration Failure; D017886:Durapatite; D005260:Female; D006801:Humans; D008297:Male; D008855:Microscopy, Electron, Scanning; D008875:Middle Aged; D010518:Periodontitis / Q000209:etiology*
chemical_list: D015921:Dental Implants; D017886:Durapatite