Statistical analysis
fracture
Statistical analyses were made using standard software (IBM SPSS; version 25). All data were submitted to the Shapiro–Wilk test to verify the normality of data. Descriptive results were shown as means and standard deviation (SD) for quantitative data and as frequency (%) for categorical data. T-test was used to compare data of pullout and fracture strength tests between groups, while the Chi-square test was used to compare failure rate modes. 