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. Author manuscript; available in PMC: 2016 Sep 1.
Published in final edited form as: Dent Mater. 2015 Jul 10;31(9):1109–1118. doi: 10.1016/j.dental.2015.06.011

Table 2.

The threshold stress intensity range (ΔKth) and Paris Law constants (m, C) for each of the materials evaluated. The constants m and C are the exponent and coefficient of the Paris Law (Eqn. 3) and represent the sensitivity to cyclic crack growth and effective growth rate, respectively. For each of the resin adhesives, (adh) and (int) refer to the adhesive and interface, respectively. Values for ΔKth and m are listed in terms of the average and standard deviation.

Property * SB (adh) SB (int) SBMP (adh) SBMP (int) Z100 Dentin
ΔKth [MPa•m0.5] 0.13±0.02 0.6±0.05 0.3±0.03 0.5±0.05 0.7±0.02 0.8±0.1
m *25< 17.5±1.1 16.8±3.0 16.1±0.6 5.4±1.3 14.1±1.6
C [(mm/cycle)(MPa•m0.5)−m] 1.2 × 1050 2.2 × 10−2 1.8 × 103 1.6 × 10−1 3.8 × 10−6 2.7 × 10−5
*

Due to instability in the fatigue crack growth responses, the values of m and C for the SB adhesive were determined from assembling the data of all the specimens. These values should be considered as estimates only.