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SEM micrographs revealing section views of partial cone morphology and crack–microstructure interaction in lithium disilicate Press subjected to sliding test using a WC sphere of radius 1.5 mm under normal load Pn = 209 N and μ = 0.29. Various fracture mechanisms are highlighted in (b): crack bridging (marked B), intergranular fracture (marked I) and transgranular fracture (marked T). Sliding direction is from left to right in the micrographs.
