Fractures of hydroxyapatite-coated blade implants connected with natural teeth. A histological study using SEM, light microscopy, and an image processing system.
A clinical study was conducted of 59 patients treated with 78 hydroxyapatite (HA)-coated blade implants from August 1986. Five implants in 5 patients were broken at the neck portion, and one implant in one patient was removed from the jaw bone. The histological findings around a broken implant which was removed from the mandible are presented. These sections showed good adaptation of the bone to the implant without a fibrous layer. Histomorphometric evaluation of bone-to-implant contact showed 73.5%. The scanning electron microscopy image of the fractured surface revealed a fatigue fracture. The suspected cause of the fracture was stress concentration at the cervix portion, because of excessive mobility or deleterious change of abutment teeth. Consequently, the osseointegration/biointegration implants should not be connected with natural teeth.
Takeshita
F
F
Prosthetic Dentistry, Faculty of Dentistry, Kyushu University, Fukuoka, Japan.
Matsushita
Y
Y
Ayukawa
Y
Y
Suetsugu
T
T
D000368:Aged; D001751:Blade Implantation / Q000295:instrumentation*; D000044:Dental Abutments; D017267:Dental Prosthesis Design; D003832:Denture, Partial, Removable; D017886:Durapatite; D005260:Female; D006097:Granulation Tissue / Q000473:pathology; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008297:Male; D008334:Mandible / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery; D008437:Maxilla / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery; D008855:Microscopy, Electron, Scanning; D008875:Middle Aged; D016348:Osseointegration; D011475:Prosthesis Failure; D011859:Radiography; D013314:Stress, Mechanical; D013499:Surface Properties; D014070:Tooth
D017886:Durapatite