2.6. Statistical Analysis
SMEAR LAYER
All the information was gathered, collated, and statistically analyzed in SPSS (Version 25.0., Armonk, NY, USA) while Microsoft Office Excel was used for data handling and graphical presentation. The Shapiro–Wilk test of normality was used to test the normality hypothesis of all quantitative variables for a different choice of appropriate parametric and non-parametric tests. The Mann–Whitney test was applied to compare the different laser groups to the control group for the remaining smear layer. The Dunnett 