Effect of exposing dentine to sodium hypochlorite and calcium hydroxide on its flexural strength and elastic modulus

Grigoratos, D; Knowles, Jonathan C.; Ng, YL; Gulabivala, K

doi:10.1046/j.1365-2591.2001.00356.x

Cited by 234 publications

(250 citation statements)

References 31 publications

(30 reference statements)

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“…The use of different irrigating solutions, 30 days before the calcium hydroxide intracanal dressing, promoted statistically significant differences among groups. The present study corroborates other studies in the literature, which observed that the dentin exposure to calcium hydroxide for one month or less, has affected negatively some dentin's mechanical properties (3,11,16,18).…”

Section: Discussionsupporting

confidence: 91%

“…However, adverse effects of NaOCl irrigation on dentin's mechanical properties (3,10,11,13,19) have been reported, including decrease of microhardness (10), flexural strength (11) and elastic modulus (3). Sodium hypochlorite promoted loss of dentinal organic components (19) because this solution is a non-specific proteolytic agent.…”

Section: Discussionmentioning

confidence: 99%

“…In this way, studies have related sodium hypochlorite irrigation with dentin microhardness reduction (10). Other reports correlate sodium hypochlorite with dentin weakening by reduced dentin flexural strength (3,10,11) and elastic modulus (3,11).…”

Section: Introductionmentioning

confidence: 96%

“…The elimination of microorganisms can be achieved using various instrumentation techniques, irrigation solutions and intracanal medicaments (1). Mechanical instrumentation results in the debridement of root canal system, but alone it cannot effectively disinfect root canals, emphasizing the need for an irrigating solution to effectively kill more microorganisms (2,3).…”

Section: Introductionmentioning

confidence: 99%

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Intracanal Irrigating Solutions Prior to Calcium Hydroxide Medication and Its Effects on Root Dentin Strength

et al. 2017

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The aim of this study was to assess the effects of intracanal irrigation with sodium hypochlorite (NaOCl) and ethylenediaminetetracetic acid (EDTA) prior to calcium hydroxide medication on the compressive strength of root dentin. Forty-eight roots with single and straight canals were instrumented with a crown-down technique using Flexofile files and Gates Glidden burs, under 0.9% sodium chloride (NaCl) irrigation. Root canals were randomly separated into 4 groups (n=12), according to the irrigating solution: Control Group, 0.9% NaCl; Group NaOCl , 1% NaOCl; Group EDTA , 17% EDTA; and Group EDTA+NaOCl , 17% EDTA and 1% NaOCl. Solutions remained for 40 min, renewed every 10 min, except for Group EDTA+NaOCl , where the solutions were alternated every 10 min. Canals were dried and filled with calcium hydroxide paste, and radiographed. Each canal was sealed and stored at 37 °C for 30 days. After this period, the roots were cut 1 mm below the cementoenamel junction and 6 mm apically from this point in order to obtain 6 mm-long cylinders. The compressive test was conducted with a crosshead speed of 1 mm/min. The means (±SD) (MPa) of compressive strength were: Control Group, 151.23±94.36; Group NaOCl , 167.50±57.25; Group EDTA , 108.79±99.88; Group EDTA+NaOCl , 60.12±92.10. Significant statistical differences among groups were found (ANOVA and Tukey, α=5%, p=0.02). Control Group and Group NaOCl showed higher means of compressive strength than Group EDTA+NaOCl . Intracanal irrigation with 17% EDTA and 1% NaOCl produced a significant reduction of dentin compressive strength 30 days after medication with calcium hydroxide.

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Section: Discussionsupporting

confidence: 91%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

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Intracanal Irrigating Solutions Prior to Calcium Hydroxide Medication and Its Effects on Root Dentin Strength

et al. 2017

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“…However, when a decalcifying agent is used prior to NaOCl, hydroxyapatite dissolves readily and the underlying collagen fibrils become clear. When NaOCl is used in this stage, it acts directly on collagen, leading to the rapid destruction of collagen in the superficial dentin (13). After chemomechanical preparation, erosion of the dentin has been demonstrated when irrigation with NaOCl is followed by the use of ethylenediaminetetraacetic acid (EDTA) or citric acid (CA) (14).…”

Section: Sodium Hypochlorite (Naocl)mentioning

confidence: 99%

Endodontic Irrigation Solutions: A Review

Topbaş

Adıgüzel

2017

Int Dent Res

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The goal of endodontic treatment is to remove all the vital and necrotic tissues, microorganisms and microbial byproducts from root canal system. This goal can be achieved through chemical and mechanical debridement of root canals. This article narrates the specifics and requirements of the irrigation solutions. Sodium hypochlorite is proposed as the primary irrigant by virtue of its organic tissue dissolution capacity and broad antimicrobial properties. On the other hand, chelation solutions are recommended as auxiliary solutions to remove the smear layer or to hinder its formation on dentin surface. Thus, it's hoped that sealers and root canal fillers can penetrate to dentin tubules and obturate the canals hermetically. There are new studies on traditional irrigants especially on some irrigants that can replace sodium hypoclorite. This article reviews the new irrigants which can be used in future endodontic practice, and their advantages and limitations. Moreover, actions and interactions of recently used irrigants are adverted.

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MTA Root Canal Obturation

Bogen¹,

Lawaty²,

Chandler³

2014

Mineral Trioxide Aggregate

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Effect of exposing dentine to sodium hypochlorite and calcium hydroxide on its flexural strength and elastic modulus

Abstract: NaOCl (3 & 5%) reduced the modulus of elasticity and flexural strength of dentine. Saturated Ca(OH)2 reduced the flexural strength of dentine but not the modulus of elasticity. Sequential use of NaOCl and Ca(OH)2 has no additional weakening effect.

Cited by 234 publications

References 31 publications

Intracanal Irrigating Solutions Prior to Calcium Hydroxide Medication and Its Effects on Root Dentin Strength

Intracanal Irrigating Solutions Prior to Calcium Hydroxide Medication and Its Effects on Root Dentin Strength

Endodontic Irrigation Solutions: A Review

MTA Root Canal Obturation

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