“…In the past, critical pore size for bone development has been thought to be in the range of 75-150 jim (Natiella, 1986), but varying results have disputed that. In one study, material with pores 20 ^im in diameter and 75 |im deep was implanted and mineralized tissue formation in the pores was found (Ehmford et al, 1980). Similarly, Eggli et al (1987) found that HA and TCP cylinders with pore size ranges of 50-100 pm showed higher ingrowth of bone than implants with pore sizes of 200-400 |am.…”