THE BIOCOMPATIBILITY OF LOW-TEMPERATURE DIAMOND-LIKE CARBON-FILMS - ATRANSMISSION ELECTRON-MICROSCOPY, SCANNING ELECTRON-MICROSCOPY AND CYTOTOXICITY STUDY

Preliminary studies have shown that diamond-like carbon (DLC) coatings can be adherent on a range of substrate materials, resistant to wear and non-toxic to cells in vitro. This has led to the question of the p ossible biomedical application of DLC-coated materials, particularly i n the field of implantation surgery. Assessment of the biocompatibilit y of implanted material requires two questions to be addressed: (1) is the implanted material toxic to cell growth, and (2) what is the natu re of the cell-DLC layer interaction? In this study we show, by the Ke nacid Blue cytotoxicity test, that cells grown on DLC-coated PCF membr anes exhibit an initial increased attachment to the carbon substrate, and thereafter exhibit a normal growth rate over the 3-day test period s compared with cells grown on uncoated polystyrene. Scanning electron microscopy shows these cells possess characteristics typical of norma l cell attachment and growth. Cells were grown on DLC-coated PCF membr anes to facilitate examination of the cell-DLC coating interface by tr ansmission electron microscopy. These results show that cells grown on both DLC-coated and non-coated membranes presented normal morphologic al characteristics of attachment and growth. These findings indicate t hat the DLC coating is non-toxic in vitro and sustains normal cell gro wth.