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High magnification (×30,000) scanning electron microscope images Cracks and crevices in Groups 1, 4, and 5, where sandblasting was performed before the sintering process noted in Fig 2a, 2d and 2e respectively. (b) (Group 2) reveals selective infiltration etching/heat-induced maturation procedure performed on sintered specimens, architectural changes noted in nanolevel, (c) (Group 3) reveals similar architectural features to that of Group 2
