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An In-Vitro Study, the Effect of Saliva on Structure, Surface Properties and Microbial Adhesion on Ni-Cr based Dental Alloy

Abu Bakr El-Bediwi and Thoraya El-Helaly

Internal structure (phases and solubility atoms) for Ni₆₃Cr_24.6Mo_10.77Si_1.50Mn_0.03C_0.01 alloy is changed after aging (stored) in saliva for a different time. Vickers hardness, maximum shear stress (m) and roughness parameters values for Ni-Cr based alloy are increased after aging in saliva. Microbiological investigation shows the Candida spp. stuck on the surface of Ni-Cr based dental alloy which reached the maximum value at four weeks. That is meant the growth of it dependent on aging time.