Fig. 2

SEM microphotographs of the control sample at 2000× magnification. a Shows patent longitudinal dentinal tubule with patches of smear layers. Samples of NaOCl without incubation period and after one-week incubation b, c show dentin covered by smear layers with a few open dentinal tubes. The combination use of sodium thiosulfate and NaOCl or sodium thiosulfate alone d, e illustrated thicker and homogenous smear layers upon the dentin surface that covered all the dentinal tubules