Stress concentration in bone was calculated for the thickness
of 0e210 mm of HA layer. The results show that the
maximum bone stress (MBS) occurs in cortical bone as
shown in Fig. 4. As the results show, the best thickness of
HA layer is 180 mm as the MBS is the minimum compared
with other thickness of HA layer, while the maximum of
MBS occurs when the implant is used without HA coating