Effects of gamma-alumina and hydroxyapatite coatings on the growth and metabolism of human osteoblasts.

The behavior of human osteoblasts cultivated on hydroxyapatite or alumina-coated disks of Ti6AL4V was studied in vitro. Cell anchorage and spreading were observed by scanning electron microscopy. Cell growth was monitored by counting cells and measuring DNA at 5 h and 2,5, and 10 days after cell seeding. Cells grown for 10 days were labeled with 14C-proline and total protein and collagen synthesis were measured; the type of collagen was also determined. Both ceramics showed excellent biocompatibility. At 10 days of culture the cells showed a higher rate of proliferation on alumina than on hydroxyapatite. Neither ceramic altered the collagen biosynthesis or the osteoblast-like properties of the cells, as indicated by the high percentage of type I collagen.