“…Crystalline silicon has long been considered as bioinert material, until, in 1995, PSi was found to be bioactive (Canham, 1995), with its biologic behavior dependent on its porosity (Bowditch et al, 1999;Canham et al, 2000;Anderson et al, 2003). PSi dissolves to orthosilicic acid, a natural and biologically important form of silicon, for example, for optimal bone and collagen growth (Anderson et al, 2003;Salonen et al, 2008).…”