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  Indian J Med Microbiol
 

Figure 3: Scanning electron microscope image of ultrasonic instrument (×50). For perfect margin shoulder 1 and 2 the entire surface of the instrument is uniformly coated with diamond particles. Perfect margin shoulder 3 is uncoated. (a) Scanning electron microscope image of perfect margin shoulder 1, 76 μm grit. (b) Scanning electron microscope image of perfect margin shoulder 2, 46 μm grit. (c) Scanning electron microscope image of perfect margin shoulder 3, no grit

Figure 3: Scanning electron microscope image of ultrasonic instrument (×50). For perfect margin shoulder 1 and 2 the entire surface of the instrument is uniformly coated with diamond particles. Perfect margin shoulder 3 is uncoated. (a) Scanning electron microscope image of perfect margin shoulder 1, 76 μm grit. (b) Scanning electron microscope image of perfect margin shoulder 2, 46 μm grit. (c) Scanning electron microscope image of perfect margin shoulder 3, no grit