IntroductionRoot canal treatment subjects dentine to mechanical stresses and chemical exposure to control the resident microbiota. The procedure leads to profound changes in the physical (Niu et al. ), mechanical (Rajasingham et al. ) and chemical (Pascon et al. ) properties of the dentine. NaOCl acts predominantly on the organic component of dentine, exhibiting little or no apparent effect on the mineral content (Pascon et al. ). EDTA chelates calcium ions in hydroxyapatite crystals and facilitates demineralization of dentine (von der Fehr & Östby ), which extends approximately 20‐50 μm into the root dentine (von der Fehr & Östby , Fraser , Verdelis et al. ).Sequential, repeated 30 min irrigation steps with 5.25% NaOCl increased tooth surface strain in cyclically loaded premolars but this tended to plateau after two irrigation steps (Sim et al. ). It was hypothesized that remaining mineral posed a barrier to deeper NaOCl penetration. Abolition of the strain plateau effect by alternate use of 5% NaOCl and 17% EDTA appeared to confirm this (Rajasingham et al. ). It was hypothesized that NaOCl and EDTA depleted the organic and mineral components, respectively, allowing a greater overall penetration of both.Studies exploring the effect of chemical irrigants on mechanical properties of dentine are conclusive in showing their
International Endodontic Journal – Wiley
Published: Jan 1, 2018
Keywords: ; ; ; ;
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