[Clinical application of sintered bone (II). Effects of collagen coating on implant materials in vitro].

In vitro studies with osteoblast-like cells, revealed that in addition to preventing the immediate outflow and promoting stabilization of implant materials, these cells have the additional effect of promoting the mending and early calcification by coating the materials with collagen. The materials used for the experiment were minute hydroxyapatite, beta-tricalcium phosphate and bovine sintered bone. To these, atelocollagen which is solble in pepsin extracted from calf corium and crosslinked by using ultraviolet rays was added. We observed the cells very closely after these materials were added to alpha-modified eagle's medium containing 10 mM beta-glycero phosphate, 10% fetal bovine serum and osteoblast-like cells and the cultures incubated at 37 degrees C and 5% CO2. After 14 and 21 days, cells were fixed and stained with Alizarin Red S and Von Kossa stains to measure calcification. As a result of the collagen coating, positive areas appeared and, compared to the control improvement of the early mending was apparent. The results suggest that by coating the materials with collagen, the osteoblast-like cells show better mending and early calcification.