Effects of chlorhexidine and sodium hypochlorite on the microhardness of root canal dentin

Oliveira, Luciane Dias de; Carvalho, Cláudio Antônio Talge; Nunes, Willian Pereira; Valera, Márcia Carneiro; Camargo, Carlos Henrique; Jorge, Antônio Olavo Cardoso

doi:10.1016/j.tripleo.2007.04.019

Cited by 96 publications

(124 citation statements)

References 19 publications

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“…According to those authors, both the concentration and the irrigation period affect the action of NaOCl in reducing microhardness. Oliveira et al (11) stated that the use of 1% NaOCl for 15 min was sufficient to reduce dentin microhardness at depths up to 1,000 µm from the canal lumen.…”

Section: Discussionmentioning

confidence: 99%

“…NaOCl causes oxidation of the organic matrix and denaturation of collagen, changing the chemical structure of dentin and affecting its mechanical properties (10). Oliveira et al (11) reported that 1% NaOCl decreased root dentin microhardness to depths up to 1,000 µm from the canal lumen. EDTA demineralizes the inorganic components of dentin by chelating calcium ions, which reduces the microhardness (12).…”

Section: Introductionmentioning

confidence: 99%

“…There is extensive scientific literature on the action of different chelating and demineralizing solutions on the microhardness of root dentin thirds and canal lumen (7,8,(11)(12)(13)(14)(15). However, little is known about the action of the chelating agents on the microhardness of the furcation area of teeth.…”

Section: Introductionmentioning

confidence: 99%

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Effect of sodium hypochlorite and edta irrigation, individually and in alternation, on dentin microhardness at the furcation area of mandibular molars

2012

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The aim of this study was to evaluate the effect of irrigation regimens on dentin microhardness at the furcation area of mandibular molars, using sodium hypochlorite and ethylenediaminetetraacetic acid (EDTA), individually and in alternation. The occlusal surface and the roots of 20 non-carious extracted human permanent mandibular molars were cut transversally and discarded. The tooth blocks were embedded in acrylic resin and randomly assigned to 4 groups (n=5) according to the irrigating regimens: 1% NaOCl solution, 17% EDTA solution, 1% NaOCl and 17% EDTA and distilled water (control). Knoop microhardness of dentin at the furcation area was evaluated. Data were analyzed using one-way ANOVA and Tukey's multiple comparison tests (α=0.05). The results of this study indicated that all irrigation solutions, except for distilled water (control), decreased dentin microhardness. EDTA did not show a significant difference with NaOCl/EDTA (p>0.05), but showed a significant difference with NaOCl (p<0.01). EDTA and NaOCl/EDTA showed a maximum decrease in microhardness. The 17% EDTA solution, either alone or in combination with 1% NaOCl reduced significantly dentin microhardness at the furcation area of mandibular molars.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of sodium hypochlorite and edta irrigation, individually and in alternation, on dentin microhardness at the furcation area of mandibular molars

2012

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“…Other studies have shown an influence of sodium hypochlorite treatment on the microhardness of dentine 10,31) . In the present study, the findings were similar for composite materials.…”

Section: Discussionmentioning

confidence: 90%

Effect of sodium hypochlorite contamination on microhardness of dental core build-up materials

2010

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This study aimed to determine the influence of sodium hypochlorite (NaOCl) contamination on the microhardness of build-up composites. Fifty-two samples, from each of three build-up materials (LuxaCore Dual, MultiCore flow and Rebilda DC) were prepared. Half of the samples from each material were stored in physiologic saline (baseline control) while the other halves were stored in NaOCl. After 1 h, the samples were rinsed with tap water, cut axially and measured for Knoop hardness at different depth levels. The results were analysed by ANOVA and unpaired t-tests (p<0.05). Significant differences in microhardness were observed for LuxaCore Dual up to 0.2 mm, Rebilda DC up to 0.3 mm, and for MultiCore flow up to 0.4 mm under the surface level. Contact with sodium hypochlorite on build-up materials causes reduction of the microhardness. The softening is not only limited on the surface, but can also be found in deeper layers of build-up materials.

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“…Three indentations were made from the middle third of the root canal at a depth of 100 µm from the pulp-dentin junction and spaced at 100 µm from each indentation. Akcay and Sen (2012), and Oliveira et al (2007) designated an equivalent configuration for the load and dwell time which was based on the inverse correlation between dentin microhardness and tubular density which was initially described by Pashley et al (1985). Hence, a 50 g load with a 10 second dwell time through the Vickers Microhardness Tester was used (Akcay & Sen, 2012;Oliveira et al, 2007).…”

Section: Discussionmentioning

confidence: 99%

The Effect of Zingiber officinale Roscoe (Ginger) on Dentin Microhardness: An in vitro Study

Zaki¹,

Baharin²,

Zaman³

et al. 2017

JAS

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It has been established that conventional root canal irrigants cause detrimental effect on the physico-chemical properties of root dentin. This study aims to determine the effect of a novel root irrigant, ginger or Zingiber officinale Roscoe essential oil on root dentin microhardness. Eighty root halves of extracted human teeth were used and prepared by embedding them individually in autopolymerizing acrylic resin. These samples were then divided into four groups (n = 20 each), i.e., i) 0.5% Z. officinale Roscoe oil, ii) 2.5% sodium hypochlorite (NaOCl, positive control), iii) 17% ethylenediaminetetraacetic acid (EDTA, positive control) and iv) normal saline (negative control). Dentin microhardness was measured using Vickers Microhardness Tester with a 50 g load and a 10-second dwell time, before and after immersion in respective solutions for 5 minutes. Measurements were taken in Vickers hardness number (VHN). All samples showed reduction in the microhardness reading; with Z. officinale Roscoe: 34.24 to 25.89, NaOCl: 31.47 to 26.34, EDTA: 33.08 to 26.04 and saline: 29.82 to 27.61 VHN. Although there was significant reduction within the Z. officinale Roscoe group (p < 0.001), the change was indifferent when compared among groups (post hoc Tukey's HSD test p > 0.05). Within the limitations of this study, Zingiber officinale Roscoe essential oil does alter dentin microhardness but to a similar extent as NaOCl and EDTA.

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Effects of chlorhexidine and sodium hypochlorite on the microhardness of root canal dentin

Cited by 96 publications

References 19 publications

Effect of sodium hypochlorite and edta irrigation, individually and in alternation, on dentin microhardness at the furcation area of mandibular molars

Effect of sodium hypochlorite and edta irrigation, individually and in alternation, on dentin microhardness at the furcation area of mandibular molars

Effect of sodium hypochlorite contamination on microhardness of dental core build-up materials

The Effect of Zingiber officinale Roscoe (Ginger) on Dentin Microhardness: An in vitro Study

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