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. Author manuscript; available in PMC: 2011 Nov 1.
Published in final edited form as: J Mech Behav Biomed Mater. 2010 Jul 16;3(8):623–629. doi: 10.1016/j.jmbbm.2010.07.004

Figure 5.

Figure 5

SEM image of the fracture part #1 exhibiting the same arrest lines in the zirconia core as with part #2. A major processing pore is seen in the veneering ceramic. The direction of crack propagation (dcp) is indicated by the white arrows. The concavity of the arrest lines as well as the presence of twist hackle in the zirconia framework point back to an origin located at the tip of the framework (see Fig. 6). A secondary edge chip (see Fig. 7) on the zirconia palatal surface next to a manually reground zirconia frame region is indicated by the white circle.