Effect of surface roughness of hydroxyapatite-coated titanium on the bone-implant interface shear strength

K. Hayashi, T. Inadome, H. Tsumura, Yasuharu Nakashima, Y. Sugioka

Research output: Contribution to journalArticle

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Abstract

We have investigated the bone-implant interface shear strength of hydroxyapatite (HA)-coated Ti-6AI-4V (HA-coating A) (roughness average, Ra = 3.4±0.5 μm) and HA-coated Ti-6AI-4V with a rougher surface (HA-coating B) (Ra = 8.4 ± 1.8 μm). There was no significant difference between HA-coating A and HA-coating B implants with respect to the bone-implant interface shear strength as determined in push-out tests using the transcortical model in adult dogs. The bone-implant interface shear strength of bead-coated porous Ti-6AI-4V was significantly greater than that of both HA-coating A and HA-coating B implants. The failure site, as determined by scanning electron microscopy, was the coating-substrate interface, not the coating-bone interface. This indicates a need to protect the HA coating from the direct shear forces. HA coating enhances early bone growth into the porous surface of the implant. Long-term fixation should depend on bone anchoring to this porous surface. Hydroxyapatite coatings must be developed which do not obstruct the pores of the surface of the implant.

Original languageEnglish
Pages (from-to)1187-1191
Number of pages5
JournalBiomaterials
Volume15
Issue number14
DOIs
Publication statusPublished - Jan 1 1994

Fingerprint

Shear Strength
Durapatite
Titanium
Hydroxyapatite
Shear strength
Bone
Surface roughness
Coatings
Bone-Implant Interface
Bone and Bones
Bone Development
Electron Scanning Microscopy

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Ceramics and Composites
  • Biophysics
  • Biomaterials
  • Mechanics of Materials

Cite this

Effect of surface roughness of hydroxyapatite-coated titanium on the bone-implant interface shear strength. / Hayashi, K.; Inadome, T.; Tsumura, H.; Nakashima, Yasuharu; Sugioka, Y.

In: Biomaterials, Vol. 15, No. 14, 01.01.1994, p. 1187-1191.

Research output: Contribution to journalArticle

Hayashi, K. ; Inadome, T. ; Tsumura, H. ; Nakashima, Yasuharu ; Sugioka, Y. / Effect of surface roughness of hydroxyapatite-coated titanium on the bone-implant interface shear strength. In: Biomaterials. 1994 ; Vol. 15, No. 14. pp. 1187-1191.
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