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

Published in final edited form as: Dent Mater. 2008 Mar 7;24(8):1107–1113. doi: 10.1016/j.dental.2008.01.002

Fig. 4 — Fig. 4a. Stereomicroscope image of zone 2 of interest. Parallel running hackle lines are concentrated in the veneering ceramic. These indicate the direction of crack propagation is from the bottom to top in this view.

Figs. 4b,c. Same area as in Fig. 4a viewed under the SEM at higher magnification. Hackle and wake hackle (emanating from pores and inclusions) are easily distinguished and used to indicating the crack was running upwards towards the occlusal side.

Fig. 4 — Fig. 4a. Stereomicroscope image of zone 2 of interest. Parallel running hackle lines are concentrated in the veneering ceramic. These indicate the direction of crack propagation is from the bottom to top in this view.

Figs. 4b,c. Same area as in Fig. 4a viewed under the SEM at higher magnification. Hackle and wake hackle (emanating from pores and inclusions) are easily distinguished and used to indicating the crack was running upwards towards the occlusal side.