“…This material has been reported in many different ways, i.e., as solid, crystalline or amorphous powder and coating. In the last years, its application has been focused as HA nanocrystals (nHA) for bone implants, as composite polymeric biocompatible fibers, as a coating on titanium prosthesis, 8 , 9 as well as in the drug delivery field 10 - 17 . When the HA is implanted, the processes of resorption, osteoconduction and bioactivity may occur, which make it very valuable for medical purposes.…”