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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. 2 — Contact damage of enamel resulting from cyclic loading. (A) Load-life diagram for cyclic contact of cuspal enamel described in terms of the maximum contact load and the number of cycles to failure. Failure was defined by an increase in maximum indentation depth that exceeded that in the first cycle by 15 μm. (B) Typical contact damage pattern resulting from cyclic loading. Note the large number of circumferential cracks inside the contact zone, and the radial cracks extending from the contact periphery. This particular damage pattern resulted from cyclic contact with maximum load of 400N and after a total of 160k cycles.

A and B: Adapted from Gao SS, An BB, Yahyazadehfar M, et al. Contact fatigue of human enamel: Experiments, mechanisms and modeling. J Mech Behav Biomed Mater 2016;60:438–50; with permission.

Fig. 2 — Contact damage of enamel resulting from cyclic loading. (A) Load-life diagram for cyclic contact of cuspal enamel described in terms of the maximum contact load and the number of cycles to failure. Failure was defined by an increase in maximum indentation depth that exceeded that in the first cycle by 15 μm. (B) Typical contact damage pattern resulting from cyclic loading. Note the large number of circumferential cracks inside the contact zone, and the radial cracks extending from the contact periphery. This particular damage pattern resulted from cyclic contact with maximum load of 400N and after a total of 160k cycles.

A and B: Adapted from Gao SS, An BB, Yahyazadehfar M, et al. Contact fatigue of human enamel: Experiments, mechanisms and modeling. J Mech Behav Biomed Mater 2016;60:438–50; with permission.