[Pull-out strength and bone tissue reaction of plasma-sprayed hydroxyapatite coatings with different thicknesses or substrates].
Synthetic hydroxyapatite has been reported to have good histocompatibility, while metal to have good mechanical properties in vivo. This author coated hydroxyapatite on SUS316L stainless steel and titanium rods, using plasma-spraying techniques. Then they were implanted into tubular bones of five dogs. The pull-out strength of hydroxyapatite-coated metals was found to be stronger than that of non-coated metals and increased with passage of the time. After four weeks postoperatively, the coating layer fractured between hydroxyapatite and the metal by the pull-out test. A numerous new bone in contact with hydroxyapatite was observed. Fifty microns is found to be an ideal thickness of the coating layer. The pull-out strength of hydroxyapatite-coated titanium was higher, comparing to that of hydroxyapatite-coated SUS316L stainless steel. These results suggested that perovskite and rutile existed at the interface between hydroxyapatite and titanium after plasma-spraying and made hydroxyapatite to bond tightly to the titanium. Synthetic perovskite showed no pathological reactions to canine bone tissue.
Ukegawa
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Department of Orthopaedic Surgery, Yokufuukai Geriatric Hospital, Tokyo, Japan.
D000818:Animals; D001842:Bone and Bones / Q000502:physiology*; D004285:Dogs; D006882:Hydroxyapatites; D019736:Prostheses and Implants; D013193:Stainless Steel; D013499:Surface Properties; D014025:Titanium
D006882:Hydroxyapatites; D013193:Stainless Steel; D014025:Titanium