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Interface mechanics and histomorphometric analysis of hydroxyapatite-coated and porous glass-ceramic implants in canine bone

✍ Scribed by Nimb, Lars ;Jensen, Jørgen Steen ;Gotfredsen, Klaus

Publisher
John Wiley and Sons
Year
1995
Tongue
English
Weight
706 KB
Volume
29
Category
Article
ISSN
0021-9304

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✦ Synopsis

Abstract

A canine study was performed to make a histological and biomechanical evaluation of the interface between bone and two different bioceramic implants. A newly developed glass‐ceramic formed by P~2~O~5~, CaO, SiO~2~, and Al~2~O~3~, giving a crystal phase composed of CaP~2~O~6~AlPO~4~SiP~2~O~7~, was compared to hydroxyapatite (HA) coated Ti6Al4V implants. A total of 24 implants were inserted into the femoral condyle of 15 adult female golden retriever dogs weighing 20–25 kg. There was a 12 week follow‐up. Implants were examined by mechanical testing, histology, histomorphometry, microradiograpic methods, and EDAX analysis. The ultimate shear strength for the HA‐coated implants was significantly higher than in the glass‐ceramic group. When these values were related to the histomorphometric measurements, the difference could be explained by the tissue‐to‐implant contact. The glass‐ceramic showed direct contact only with nonmineralized, osteoid bone. The HA‐coated implants, however, were integrated into the bone. The study indicated that porous glass‐ceramic containing AlPO~4~ causes local osteomalacia and might not be suitable for clinical purposes. © 1995 John Wiley & Sons, Inc.

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