Histomorphometric analyses of hydroxyapatite‐coated and uncoated titanium implants. The importance of the implant design

Abstract
Hydroxyapatite‐coated and uncoated titanium screws were inserted in the rabbit tibial metaphysis and evaluated by histomorphometry after 6 months of follow‐up. There was no difference in direct bone contact between the HA‐coated implants and the uncoated controls. The effect of HA‐coating on screw‐shaped implants seems to be uncertain, in contrast to unthreaded cylindrical designs, where there is more abundant documentation in favour of HA‐coated implants.

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