2.9. Statistical Analysis
SPSS version 23 (SPSS Inc., Chicago, IL, USA) was used for data analysis. Intra-class correlation was used to determine intra- and inter-observer reliability. For determination of intra-observer reliability, 60 sample images were randomly selected and re-evaluated after 2 weeks by the same examiners.The Shapiro–Wilk test showed non-normal data distribution. Kruskal–Wallis testing was used for mean comparison of all sealers and techniques. A series of Mann–Whitney tests were applied for multiple pairwise comparisons. Significance for the purposes of post hoc tests was adjusted using the Bonferroni method; a The Bonferroni adjustment method was used to counteract the statistical type I error in the study resulting from performing multiple Mann–Whitney comparisons.