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. Author manuscript; available in PMC: 2014 Nov 1.
Published in final edited form as: Biomaterials. 2013 Aug 13;34(34):8650–8659. doi: 10.1016/j.biomaterials.2013.07.090

Figure 3.

Figure 3

Micrographs of a fractured dentin specimen after fatigue loading to failure in the lactic acid solution. a) the fracture surface of a dentin beam after 5×10^5 cycles. This specimen was subjected to a cyclic stress amplitude of 40 MPa. The tensile surface (T) and compression curl (C) are highlighted. b) Micrograph from the specimen in (a) near the tensile surface and at higher magnification (X8000) revealing collagen fibrils (arrows) exposed on the fracture surface. c) a high magnification photo of a control specimen for comparison to (b). Note that absence of collagen fibrils, which are clearly evident in (b).