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. Author manuscript; available in PMC: 2013 Aug 16.
Published in final edited form as: Acta Biomater. 2012 Sep 25;9(1):4806–4814. doi: 10.1016/j.actbio.2012.09.020

Fig. 2.

Fig. 2

Characterizing the degree of decussation from the fracture surfaces. The direction of crack extension is from left to right. (a) SEM micrograph of a fracture surface. The rods uniformly extend from the occlusal surface (bottom) but begin to undergo decussation close to the back channel. The degree of decussation at a specific crack length is defined as the ratio of decussated fracture area A* to total fracture area A. (b) Micrograph of non-decussated outer enamel close to occlusal surface. (c) Micrograph of heavily decussated inner enamel close to back channel.