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  Indian J Med Microbiol
 

Figure 4: Scanning electron microscope pictures of tested wires before friction test. (a) As-received stainless steel wire showing smooth surface. (b) Stainless steel wire after in vitro fluoride application did not show significant defects. (c) Stainless steel wire after in situ fluoride application did not show significant defects. (d) As-received nickel-titanium wire. White arrows show areas of longitudinal cracks. (e) Nickel-titanium wires after in vitro fluoride application with major cracks marked with white arrows. (f) Nickel-titanium after in situ fluoride application. White arrows point to numerous areas of longitudinal defects

Figure 4: Scanning electron microscope pictures of tested wires before friction test. (a) As-received stainless steel wire showing smooth surface. (b) Stainless steel wire after <i>in vitro</i> fluoride application did not show significant defects. (c) Stainless steel wire after <i>in situ</i> fluoride application did not show significant defects. (d) As-received nickel-titanium wire. White arrows show areas of longitudinal cracks. (e) Nickel-titanium wires after <i>in vitro</i> fluoride application with major cracks marked with white arrows. (f) Nickel-titanium after <i>in situ</i> fluoride application. White arrows point to numerous areas of longitudinal defects