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(a) Occlusal view of a resin composite crown from the mild profile (indentation load of 1200 N at 170K loading cycles). (b) Details of the fatigue scar in a resin composite crown from the aggressive profile (indentation load of 1700 N at 90K cycles). Note in (b): minor spalling measuring 1255 µm and 1796 µm in the bucco-lingual and mesio-distal directions, respectively.
