Impact of chemical agents for surface treatments on microhardness and flexural strength of root dentin

Marcelino, Ana Paula Marcheto; Bruniera, João Felipe Bonatto; Rached-Junior, Fuad Jacob Abi; Silva, Sílvio Rocha Corrêa da; Messias, Danielle Cristine Furtado

doi:10.1590/1807-3107bor-2014.vol28.0052

Cited by 16 publications

(18 citation statements)

References 27 publications

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“…It has been suggested that, although chemical substances can reduce tooth hardness, this change in hardness does not interfere with substrate resistance. 30 By contrast, Uzunoglu et al 17 showed that fracture resistance of endodontically treated roots was differently affected by the various EDTA concentrations, followed by irrigation with NaOCl, at different exposure times.…”

Section: Discussionmentioning

confidence: 97%

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: 97%

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

et al. 2017

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“…Different studies have shown that using NaOCl as an irrigating solution signi cantly reduces the microhardness value (31)(32)(33). Most studies used short exposure times of 5-15 min and revealed a reduction in the dentin micro-hardness value compared with irrigating with normal saline(32, 33).…”

Section: Discussionmentioning

confidence: 99%

Assessment of sodium thiosulfate neutralizing effect on micro-hardness of dentin treated with sodium hypochlorite

Sahebi

Sobhnamayan

Moazami

et al. 2020

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Background: This study aims to evaluate the ability of sodium thiosulfate (STS) to neutralize the adverse effect of sodium hypochlorite (NaOCl) on dentin micro-hardness.Methods: Fifty single-rooted teeth were longitudinally sectioned. The samples divided into a control and four sample groups (n = 20). All the samples were immersed in different solutions as follows, Control: Normal saline for 15 min, G1and G2: 2.5% NaOCl for 15 min, G3: 2.5% NaOCl for 15 min, followed by 5% STS for 10 min, G4: Normal saline for 15 min followed by 5% STS for 10 min. All groups except G1 incubated for one week before the test. The micro-hardness of samples was measured. Data were analyzed using the Kruskal-Wallis test for pairwise comparisons. A p-value < 0.05 was considered significant. Results: All groups showed a significant decrease in the micro-hardness value compared with the control group. NaOCl for one week (G2) reduced the micro-hardness of dentine compared with samples, tested immediately after immersion in NaOCl (G1) (p < 0.05). NaOCl alone (G2) or treated with STS (G3) resulted in a significant decrease in micro-hardness compared with the STS group (G4) (p < 0.05).Conclusions: STS as a neutralizing agent could not prevent the dentin micro-hardness downturn caused by NaOCl.

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“…Different studies have shown that using NaOCl as an irrigating solution signi cantly reduces the microhardness value (28)(29)(30). Most studies used short exposure times of 5-15 min and revealed a reduction in the dentin micro-hardness value compared with irrigating with normal saline (29,30). Souza et al reported that an increase in the volume and/or time of exposure to 5.25% NaOCl causes a signi cant reduction in root toughness.…”

Section: Discussionmentioning

confidence: 99%

Assessment of Sodium Thiosulfate Neutralizing Effect on Micro-hardness of Dentin Treated With Sodium Hypochlorite

Sahebi

Sobhnamayan

Naseri

et al. 2020

Preprint

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Background The aim of this study is to evaluate the ability of sodium thiosulfate (STS) to reverse the adverse effect of sodium hypochlorite (NaOCl) on dentin microhardness. Methods Fifty single-rooted teeth were decoronated and longitudinally sectioned. The samples were divided into a control and four sample groups (n = 20): Normal saline for 15 min as the control group, G1: 2.5% NaOCl for 15 min without an incubation period, G2: 2.5% NaOCl for 15 min, G3: 2.5% NaOCl for 15 min irrigated with normal saline followed by 5% Na2S2O3 for 10 min, G4: Normal saline for 15 min followed by 5% Na2S2O3 for 10 min. All groups except G1 were incubated for 1 week. The microhardness measurements were determined using the Vickers micro-hardness test. Data were analyzed using the Kruskal-Wallis test for pairwise comparisons. A p-value < 0.05 was considered significant. Results All groups showed a significant decrease in the micro-hardness value compared with the control group. NaOCl for 1 week (G2) reduced the micro-hardness of dentine compared with samples, tested immediately after immersion in NaOCl (G1) (p < 0.05). NaOCl alone (G2) or treated with Na2S2O3 (G3) resulted in a significant decrease in microhardness compared with the Na2S2O3 group (G4) (p < 0.05). Conclusions Sodium thiosulfate as a neutralizing agent could not prevent the microhardness downturn caused by sodium hypochlorite

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Impact of chemical agents for surface treatments on microhardness and flexural strength of root dentin

Cited by 16 publications

References 27 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

Assessment of sodium thiosulfate neutralizing effect on micro-hardness of dentin treated with sodium hypochlorite

Assessment of Sodium Thiosulfate Neutralizing Effect on Micro-hardness of Dentin Treated With Sodium Hypochlorite

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