Using SPSS 20.0 software (USA), the Shapiro-Wilk test and the Lilliefors Significance Correction were used for normality, followed by the Mann-Whitney U test which was used to compare the CFU difference (×105) between the two groups. 
SPSS
Microbiological Effectiveness of Sodium Hypochlorite Gel and Aqueous Solution When Implemented for Root Canal Disinfection in Multirooted Teeth: A Randomized Clinical Study.The aim of endodontic therapy is to use various antimicrobial medications for proper cleaning and shaping to create an environment free of microorganisms by eradicating as many as possible from the root canal space.  Using SPSS 20.0 software (USA), the Shapiro-Wilk test and the Lilliefors Significance Correction were used for normality, followed by the Mann-Whitney U test which was used to compare the CFU difference (×105) between the two groups. 
USA