Bioceramics have been widely used in medicine and dentistry. One remarkable success of bioceramics is the emergence and clinical use of bioactive ceramics. 1 Over the past 20 years, a wide range of calcium phosphates-such as hydroxyapatite (HA), 2-4 amorphous calcium phosphate, 5-8 tetra-calcium phosphate, 9 and mono-di calcium phosphate 10-12-has been studied in both dentistry and in orthopedics fields. Micro or nanoscale HA have been investigated, and their mechanical properties have been tested. 13 Calcium phosphates are primarily used for bone replacement, since they are biocompatible, have a low density, have excellent chemical stability