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SEM photomicrographs of a crown from V2F group failed by chipping. a) Overview of the fracture (22x). b) The area of load application is indicated by the white arrow; the presence of wake hackles (black arrows) indicates the direction of failure propagation (60x). c) Closer view of the area under the load application; it can be observed the presence of many bubbles resulted from the stratified technique (150x). F: feldspathic veneering ceramic.
