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. Author manuscript; available in PMC: 2009 Dec 1.

Published in final edited form as: Biomaterials. 2008 Sep 18;29(36):4847–4854. doi: 10.1016/j.biomaterials.2008.08.019

Observations of crack extension in HAp.

(a) relatively smooth fracture plane of HAp compared to enamel in Figure 4

(b) a magnified view of fracture plane showing voids across the specimen thickness. The image was taken at the surface corresponding to steady state growth (ΔK∼ 0.2 MPa·m^0.5).

(c) A typical high magnification image of fracture surface of the sintered HAp. Notice the surface is primarily uniform but does exhibit a few HAp crystals (white arrowheads) pullout.

Observations of crack extension in HAp.

(a) relatively smooth fracture plane of HAp compared to enamel in Figure 4

(b) a magnified view of fracture plane showing voids across the specimen thickness. The image was taken at the surface corresponding to steady state growth (ΔK∼ 0.2 MPa·m^0.5).

(c) A typical high magnification image of fracture surface of the sintered HAp. Notice the surface is primarily uniform but does exhibit a few HAp crystals (white arrowheads) pullout.