Incidence of Apical Crack Initiation during Canal Preparation using Hand Stainless Steel (K-File) and Hand NiTi (Protaper) Files.

Int J Clin Pediatr Dent · 2016 · PMC5233695 · PMID 28127160

Europe PMC DOI

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highly significantp = 0.000not a probability at all

Chi-square testing revealed a highly significant effect of WL on crack formation at WL and 1 mm short of WL (p = 0.000).

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