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(a) Schematic of occlusion, showing that posterior tooth-tooth contact can be visualized as a spherical indenter sliding down an inclined flat surface. Experimental set-up for (b) single-cycle sliding with a translating sphere; and (c) multi-cycle off-axis fatigue loading with a 30° inclination angle. Note the superposed tangential force component in (b) and (c). The symbol Pc and R denote partial cone and flexural radial cracks, respectively.
