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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. 6 — Figs. 6a,b. Stereomicroscope images of zone 4 showing an array of corner hackle radiating from the core towards the veneer confirmed by wake hackle in the veneer. This radiating fan-like pattern is generated when a crack goes around a corner of a structure. The direction of crack propagation (dcp) is marked by a black arrow.

Fig. 6 — Figs. 6a,b. Stereomicroscope images of zone 4 showing an array of corner hackle radiating from the core towards the veneer confirmed by wake hackle in the veneer. This radiating fan-like pattern is generated when a crack goes around a corner of a structure. The direction of crack propagation (dcp) is marked by a black arrow.