Spss software v 19 for windows

Considering the mean values obtained with a difference of approximately 2 MPa between each group and the highest standard deviation of 3.6 in adhesion data, a sample size of 10 in each group was calculated (IBM SPSS Software V.19 for Windows and G*Power, Chicago, IL, USA) to have more than 80% power to detect a difference in means of tensile bond strength using a two-group Satterthwaite t-test (IBM SPSS Software V.19 for Windows, Chicago, IL, USA) (alpha = 0.05). The obtained data were analyzed statistically (SPSS Software V.20, Chicago, IL, USA). Normal distribution was tested using Kolmogorov–Smirnov and Shapiro–Wilk tests. Normality was not violated and therefore univariate analysis of variance (1-way ANOVA), Tukey’s and Tamhane post-hoc tests for the adhesion surfaces, effects of adhesion methods on deformations and stress values were performed. Furthermore, 2-parameter Weibull distribution was used for calculating Weibull modulus, scale (m) and shape (₀) in order to assess the reliability of adhesion (Minitab Software V.16, State College, PA, USA). In all tests, p < 0.05 was considered to be statistically significant.