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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. 7 — Figs. 7a,b. SEM images of zone 5 (distal portion of the crown part) showing a 2 mm in length compression curl in which wake hackle and twist hackle confirm the final breakthrough of the fracture crack.

Fig. 7 — Figs. 7a,b. SEM images of zone 5 (distal portion of the crown part) showing a 2 mm in length compression curl in which wake hackle and twist hackle confirm the final breakthrough of the fracture crack.