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Analysis of the effects of several decalcifying agents alone and in combination with sodium hypochlorite on the chemical composition of dentine
Author(s) -
Tartari T.,
Bachmann L.,
Zancan R. F.,
Vivan R. R.,
Duarte M. A. H.,
Bramante C. M.
Publication year - 2018
Publication title -
international endodontic journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.988
H-Index - 119
eISSN - 1365-2591
pISSN - 0143-2885
DOI - 10.1111/iej.12764
Subject(s) - sodium hypochlorite , peracetic acid , nuclear chemistry , chemistry , phosphate , fourier transform infrared spectroscopy , demineralization , hypochlorite , chlorine , dentin , amide , dentistry , inorganic chemistry , organic chemistry , chemical engineering , enamel paint , medicine , engineering , hydrogen peroxide
Aim To investigate the effects of several decalcifying agents alone and in combination with sodium hypochlorite (Na OC l) on the organic and inorganic components of dentine using attenuated total reflectance in Fourier transform infrared spectroscopy ( ATR ‐ FTIR ). Methodology Dentine slices from bovine teeth were submitted to ( n = 5) the following: 0.9% saline, 9% and 18% etidronic acid ( HEDP ), 5% and 10% tetrasodium EDTA ( EDTAN a 4 ), 17% trisodium EDTA ( EDTAHN a 3 ), and 0.5% and 2.0% peracetic acid ( PAA ) for 0.5–10 min; and to the combinations: G1 – mixture 5% Na OC l + 18% HEDP (5 and 10 min); G2 – mixture 5% Na OC l + 10% EDTAN a 4 (5 and 10 min); G2 – 2.5% Na OC l (5 min) + 17% EDTAHN a 3 (1 min); G3 – 2.5% Na OC l (5 min) + 0.5% PAA (1 min); G4 – 2.5% Na OC l (5 min) + 9% HEDP (5 min). Specimens of G2, G3 and G4 received final flushes with 2.5% Na OC l for 0.5–10 min. Amide III /phosphate and carbonate/phosphate ratios of the spectra collected from the dentine specimens before and after immersion in the solutions were determined. Data were submitted to one‐way repeated measures and one‐way anova . Results For the same decalcifying agent, the higher the concentration and immersion time the greater the removal of phosphate, exposure of collagen matrix and consequently the increases in amide III /phosphate ratio. However, significant differences were found only between the two concentrations of PAA ( P < 0.05). PAA caused greater increases in this ratio, followed by EDTAHN a 3 , EDTAN a 4 and HEDP , and this order was retained in the combinations with Na OC l. This ratio was significantly reduced in G1 ( P < 0.05) and not altered in G2 ( P > 0.05). Due to collagen degradation, the amide III /phosphate ratio reduced significantly after the use of Na OC l in G3, G4 and G5 ( P < 0.05). Na OC l required approximately 0.5 s to deproteinate the collagen matrix exposed after phosphate removal by EDTAHN a 3 and PAA . The carbonate of dentine was removed more rapidly than phosphate by all decalcifying agents alone and in G3, G4 and G5. In the combinations with Na OC l, the last irrigant used defined the dentine amide III /phosphate and carbonate/phosphate ratios. Conclusions HEDP and EDTAN a 4 caused minor whilst EDTAHN a 3 and PAA caused greater demineralization of dentine; both effects were time and concentration dependent. Na OC l degraded the dentine organic matrix more rapidly when it was exposed. Combinations of Na OC l and decalcifying agents can be used to create dentine surfaces with varying compositions for interaction with endodontic sealers.