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  Indian J Med Microbiol
 

Figure 1: Scanning electron microscope image of zinc phosphate cement (×500). (a) Control group: The well-defined plate-like zinc oxide crystals are tightly packed covering the entire surface of the cement. (b) 10% CP bleaching: Multiple flat, irregular zinc oxide particles. Some are fused together. (c) 16% CP bleaching: Slight erosion of the matrix and flatter and more irregular particles are evident. (d) 22% CP bleaching: More erosion of the matrix is evident. Fewer irregular crystals are observed. The particles are more rounded and some are fused together. Few pores are evident. CP = Carbamide peroxide

Figure 1: Scanning electron microscope image of zinc phosphate cement (×500). (a) Control group: The well-defined plate-like zinc oxide crystals are tightly packed covering the entire surface of the cement. (b) 10% CP bleaching: Multiple flat, irregular zinc oxide particles. Some are fused together. (c) 16% CP bleaching: Slight erosion of the matrix and flatter and more irregular particles are evident. (d) 22% CP bleaching: More erosion of the matrix is evident. Fewer irregular crystals are observed. The particles are more rounded and some are fused together. Few pores are evident. CP = Carbamide peroxide