Estimated depth of apatite and collagen degradation in human dentine by sequential exposure to sodium hypochlorite and EDTA: a quantitative FTIR study

Estimated depth of apatite and collagen degradation in human dentine by sequential exposure to... 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 http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png International Endodontic Journal Wiley

Estimated depth of apatite and collagen degradation in human dentine by sequential exposure to sodium hypochlorite and EDTA: a quantitative FTIR study

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Publisher
Wiley Subscription Services, Inc., A Wiley Company
Copyright
Copyright © 2018 International Endodontic Journal. Published by John Wiley & Sons Ltd
ISSN
0143-2885
eISSN
1365-2591
D.O.I.
10.1111/iej.12864
Publisher site
See Article on Publisher Site

Abstract

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

Journal

International Endodontic JournalWiley

Published: Jan 1, 2018

Keywords: ; ; ; ;

References

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