Figure 2

Micro-hardness, measured at SHIMADZU HMV 2T, comparison between control group and sterilization methods, bars indicate the average hardness and the lines represent the standard deviation. Anova statistical analysis (Anova and graphics produced at excel 2013) indicates a significant association between the sterilization method and the micro-hardness, H value is highly significant 52.5432 (p = 0.00001).