A low-temperature biomimetic calcium phosphate surface enhances early implant fixation in a rat model
✍ Scribed by Kuroda, S. ;Virdi, A. S. ;Li, P. ;Healy, K. E. ;Sumner, D. R.
- Publisher
- John Wiley and Sons
- Year
- 2004
- Tongue
- English
- Weight
- 240 KB
- Volume
- 70A
- Category
- Article
- ISSN
- 0021-9304
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✦ Synopsis
The present study demonstrates increased early mechanical fixation of titanium implants coated with a new biomimetic apatite surface in a rat model. Male Sprague-Dawley rats received unilateral femoral medullary implants for periods of 1-4 weeks. The strength of fixation of the implant to the host bone increased more rapidly in the group receiving apatite-treated implants compared with the control group as evidenced by the apatite group's 21-fold greater fixation strength at 1 week (p = 0.009), 4-fold greater fixation strength at 2 weeks (p = 0.041), and 2-fold greater fixation strength at 4 weeks (p = 0.093) compared with the control. Fixation strength was correlated with bone-implant contact as determined from micro computed tomography assessment of the specimens (r2 = 0.338, p = 0.011 in the control group and r2 = 0.543, p < 0.001 in the apatite group). Furthermore, for a given amount of bone-implant contact, the fixation strength was higher in the apatite group than in the control group (p = 0.011), suggesting that the bone formed a stronger bond to the apatite coating than to the titanium. This difference in bonding strength accounted for the difference in mechanical behavior.