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. Author manuscript; available in PMC: 2008 Nov 1.

Published in final edited form as: Dent Mater. 2007 Jan 31;23(11):1397–1404. doi: 10.1016/j.dental.2006.12.002

Fig. 5 — a: Occlusal view (at 10x) of the Procera AllCeram crown showing the veneer failure on the palatal-mesial cusp. Major wear is visible on all four cusps. The frame near the mesial gingival margin is magnified in Fig.5b and Fig.5c

b and c: Higher magnifications within the frame (Fig.5a) near the interproximal mesial margin show hackle and wake hackle indicating the direction of crack propagation towards the margin.

Fig. 5 — a: Occlusal view (at 10x) of the Procera AllCeram crown showing the veneer failure on the palatal-mesial cusp. Major wear is visible on all four cusps. The frame near the mesial gingival margin is magnified in Fig.5b and Fig.5c

b and c: Higher magnifications within the frame (Fig.5a) near the interproximal mesial margin show hackle and wake hackle indicating the direction of crack propagation towards the margin.