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Inflammatory markers' levels which reduced after non‐surgical root canal retreatment (Re‐RCT) and periapical surgery (PS). p Value—difference between Medians was compared using Wilcoxon Signed‐Rank test; (T0) before treatment; (3 M) 3‐month review; (6 M) 6‐month review; (1 Yr) 1‐year review; *(p < .05); **(p < .01); ***(p < .001), ****(p < .0001).
