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. Author manuscript; available in PMC: 2017 Mar 1.
Published in final edited form as: Mater Sci Eng C Mater Biol Appl. 2015 Nov 14;60:324–332. doi: 10.1016/j.msec.2015.11.039

Fig. 3.

Fig. 3

(a) Cumulative amount of Ca2+ ion released from hollow HA, CHA9, and CHA12 microspheres into 0.1 M potassium acetate buffer solution (pH = 5.0; 37 °C) as a function of immersion time. (b) Amount of Ca2+ ions released from the three groups of microspheres after 1 h in the buffer solution. For comparison, the release of Ca2+ ions from a β-TCP reference material is also shown. (*significant difference between groups; p<0.05)