Effect of Chelating Solutions on the Microhardness of Root Canal Lumen Dentin

Filho, Antônio Miranda da Cruz; Sousa‐Neto, Manoel Damião; Savioli, Ricardo Novak; Silva, Ricardo Gariba; Vansan, Luíz Pascoal; Pécora, Jesus Djalma

doi:10.1016/j.joen.2010.12.001

Cited by 143 publications

(165 citation statements)

References 35 publications

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“…8,12,25 Fuentes et al 26 determined the microhardness of superficial and deep dentin by means of two indentation methods (Knoop and Vickers) under two different applied loads. Knoop hardness was significantly higher for superficial dentin than for deep dentin, 26 presenting sensitivity to surface effects and textures, 13 suggesting that superficial dentin, closer to the pulp, should be analyzed with this method. 27 As in the present study, the Knoop indenter was used in previous investigations to evaluate changes in dentin microhardness.…”

Section: Discussionmentioning

confidence: 99%

“…27 As in the present study, the Knoop indenter was used in previous investigations to evaluate changes in dentin microhardness. 13,27 Some studies in the literature have evaluated changes in dentin microhardness after canal irrigation with different solutions. 8,13,25 However, they have not evaluated initial microhardness, which may render the results imprecise, since the teeth have different initial physical characteristics.…”

Section: Discussionmentioning

confidence: 99%

“…13,27 Some studies in the literature have evaluated changes in dentin microhardness after canal irrigation with different solutions. 8,13,25 However, they have not evaluated initial microhardness, which may render the results imprecise, since the teeth have different initial physical characteristics. In the present study, the average of the three indentations at 100 μm and 500 μm before irrigation was obtained to provide a representative value of the initial microhardness of each specimen.…”

Section: Discussionmentioning

confidence: 99%

“…8 The use of chelating agents for final irrigation removes the smear layer and reduces dentin microhardness, which increases the access of the irrigant to dentinal tubules, allowing for proper disinfection. 13 However, the effects of such calcium loss on tooth fracture resistance and on the adhesion of endodontic sealers deserve clinical attention. It has been suggested that, although chemical substances can reduce tooth hardness, this change in hardness does not interfere with substrate resistance.…”

Section: Discussionmentioning

confidence: 99%

“…10 These solutions can remove dentin calcium ions, 8,10 favoring smear layer removal. 6,11 However, it is known that such chemical auxiliary substances are responsible for reaching the inorganic structure of dentin and thereby cause changes in dentin microhardness 8,12,13 and erosion. 12,14,15,16 Some studies have suggested that these changes could increase the susceptibility to tooth fracture.…”

Section: Introductionmentioning

confidence: 99%

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Effect of final irrigation protocols on microhardness reduction and erosion of root canal dentin

et al. 2017

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This study aimed to evaluate the effect of final irrigation protocols on microhardness reduction and erosion of root canal dentin. Sixty root canals from mandibular incisors were instrumented and randomly divided into six groups (n = 10) according to the irrigant used: QMiX, 17% EDTA, 10% citric acid (CA), 1% peracetic acid (PA), 2.5% NaOCl (solution control), and distilled water (negative control). The chelating solutions were used to irrigate the canal followed by 2.5% NaOCl as a final flush. After the irrigation protocols, all specimens were rinsed with 10 mL of distilled water to remove any residue of the chemical solutions. Before and after the final irrigation protocols, dentin microhardness was measured with a Knoop indenter. Three indentations were made at 100 µm and 500 µm from the root canal lumen. Afterwards, the specimens were prepared for scanning electron microscopic analysis and the amount of dentin erosion was examined. Wilcoxon and Kruskal-Wallis tests were used to analyze the results with a significance level set at 5%. At 100 µm, all protocols significantly reduced dentin microhardness (p < .05), while at 500 µm, this effect was detected only in the EDTA and QMiX groups (p < .05). CA was the irrigant that caused more extensive erosion in dentinal tubules, followed by PA and EDTA. QMiX opened dentinal tubules, but did not cause dentin erosion. Results suggest that QMiX and 17% EDTA reduced dentin microhardness at a greater depth. Additionally, QMiX did not cause dentin erosion.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Effect of final irrigation protocols on microhardness reduction and erosion of root canal dentin

et al. 2017

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Effect of final irrigation protocols on microhardness and erosion of root canal dentin

Aranda-Garcia

Kuga

Chávez-Andrade

et al. 2013

Microscopy Res & Technique

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The aim of this study was to evaluate the effect of final irrigation protocols (17% EDTA, BioPure MTAD, SmearClear, and QMiX) on microhardness and erosion of root canal dentin. Fifty roots were sectioned transversely at the cement-enamel junction and each root was sectioned horizontally into 4-mm-thick slices. The samples were divided into five groups (n = 10) according to the final irrigation protocol: G1: distilled water (control group); G2: 17% EDTA; G3: BioPure MTAD; G4: SmearClear; and G5: QMiX. The dentin microhardness was then measured with a load of 25 g for 10 s. Initially, the reference microhardness values were obtained for the samples without any etching. The same samples were then submitted to the final irrigation protocols. A new measure was realized and the difference between before and after the procedures was the dentin microhardness reduction. In sequence, the specimens were submitted to SEM analysis to verify the dentinal erosion. The Kruskal Wallis and Dunn tests (α = 5%) were used to compare the results. The dentin microhardness decreased for all final irrigation protocols. There was no significant difference between groups 2, 3, 4, and 5 (P > 0.05), but this groups presented significant dentin microhardness reduction than G1 (P < 0.05). In G2, occurred the highest incidence of dentinal erosion (P < 0.05). 17% EDTA, BioPure MTAD, SmearClear, and QMiX promoted significant dentin microhardness reduction. Dentinal tubules erosion was promoted by 17% EDTA.

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Effect of EDTA, sodium, and calcium hypochlorite on the inorganic component of root canal dentin: A SEM analysis

Cardoso

Baldasso

Delai

et al. 2018

Microscopy Res & Technique

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This study evaluated the influence of canal irrigation protocols with 5.25% calcium hypochlorite [Ca(OCl) 2 ], 5.25% sodium hypochlorite (NaOCl) and 17% EDTA solution on the inorganic component of root canal dentin. Sixty roots were randomly divided into six groups (n = 10): Saline solution (SS) (control); Saline solution (SSE) +17% EDTA; CH − 5.25% Ca(OCl) 2 ; CHE − 5.25% Ca(OCl) 2 + 17% EDTA; SH − 5.25% NaOCl; SHE − 5.25% NaOCl +17% EDTA. After canal irrigation, the specimens were longitudinally split and analyzed by scanning electron microscopy (SEM). Dentinal tubules were observed in transverse (middle and apical thirds) direction. The images were classified in scores, according to smear layer removal and peritubular dentin alteration, and data were analyzed by Kruskal-Wallis's test, followed by Dunn's test (α = 0.05). In the middle third, all groups with EDTA presented better removal of the smear layer with higher peritubular dentin alteration (p < .05). In the apical third, this happened only in SHE (p < .05).Ca(OCl) 2 and NaOCl exhibit similar performance to remove smear layer and alteration of the inorganic component in the middle third. In the apical third, NaOCl associated with EDTA showed better performance in smear layer removal.

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Effect of Chelating Solutions on the Microhardness of Root Canal Lumen Dentin

Cited by 143 publications

References 35 publications

Effect of final irrigation protocols on microhardness reduction and erosion of root canal dentin

Effect of final irrigation protocols on microhardness reduction and erosion of root canal dentin

Effect of final irrigation protocols on microhardness and erosion of root canal dentin

Effect of EDTA, sodium, and calcium hypochlorite on the inorganic component of root canal dentin: A SEM analysis

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