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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. 3 — Figs. 3a-c. SEM images of the chip in zone 1 at different magnifications. Arrest lines, hackle and wake hackle are recognizable and provide the direction of crack propagation (dcp) as marked by a black arrow from the margin upwards.

Fig. 3 — Figs. 3a-c. SEM images of the chip in zone 1 at different magnifications. Arrest lines, hackle and wake hackle are recognizable and provide the direction of crack propagation (dcp) as marked by a black arrow from the margin upwards.