highly significantP < 0.001
Results: Kruskal–Wallis H -test used revealed a significant difference among all the test groups ( P < 0.001), while variations in the median retention strength values obtained were found to be statistically significant when compared between Group A and Group C specimens ( P = 0.033) and statistically highly significant between Group A and Group B, and Group B and Group C specimens ( P < 0.001) on post hoc analysis by Mann–Whitney U -test for pairwise comparisons among independent groups.