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. Author manuscript; available in PMC: 2018 Oct 1.
Published in final edited form as: Dent Clin North Am. 2017 Oct;61(4):651–668. doi: 10.1016/j.cden.2017.05.001

Fig. 4.

Fig. 4

Fig. 4

The importance of location and age on the fatigue crack growth resistance of coronal dentin. (A) Responses obtained for cyclic crack growth occurring “in-plane” with the dentin tubules. These responses are for young dentin (age ≤ 30 yrs) and stratified according to depth, including close to the pulp (inner), the mid–coronal region (central) and close to the DEJ (peripheral). (B) Comparison of cyclic crack growth in the dentin of teeth from young (age ≤ 30 yrs) and old (55 yrs ≤ age) donors. These responses are for cyclic crack growth occurring perpendicular to the dentin tubules.

A: Adapted from Ivancik J, Neerchal NK, Romberg E, et al. The reduction in fatigue crack growth resistance of dentin with depth. J Dent Res 2011;90(8):1031–1036; with permission.

B: Adapted from Ivancik J, Majd H, Bajaj D, et al. Contributions of aging to the fatigue crack growth resistance of human dentin. Acta Biomater 2012;8(7):2737–2746; with permission.