Influence of different irrigation protocols on microhardness and flexural strength values of young and aged crown dentin

Pedersen, Nurab Deniz; Uzunoğlu-Özyürek, Emel; Buzoğlu, Hatice Doğan

doi:10.1111/ger.12444

Cited by 7 publications

(28 citation statements)

References 36 publications

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“…Oldaged dentine was reported to have greater hardness and elastic modulus, and mineral content compared with young dentine (Xu et al 2014). A previous study, however, reported similar changes in the root canal dentine after EDTA irrigation in both young and old age groups (Pedersen et al 2020).…”

Section: Discussionmentioning

confidence: 88%

Surface and structural changes in root dentine by various chelating solutions used in regenerative endodontics

et al. 2020

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Aim To evaluate the effects of the prolonged use of various irrigant solutions used during regenerative endodontic procedures on the physical and chemical structure of root canal dentine in extracted human teeth. Methodology Sixtyroot dentine samples from extracted, single‐rooted, human teeth were assigned to 10 groups. Eight groups were irrigated with 1.5% NaOCl for 5 min, followed by 3%, 10%, 17% EDTA or 10% citric acid (CA) for 5 or 10 min. One group received only NaOCl irrigation, and samples with only distilled water irrigation were used as a control group. The changes in microhardness and flexural strength were determined using Vickers and 3‐point flexural tester, respectively. Molecular and elemental compositions were recorded using FTIR and EDS spectroscopy. Data were analysed using one‐way anova, Kruskal–Wallis and Mann–Whitney U tests. Results The application of 1.5% NaOCl for 5 min did not affect the mineral content or microhardness of dentine (P > 0.05). However, it significantly decreased the dentine collagen peak values (P < 0.05), which was similar to the control group after the use of chelating agents (EDTA and 10% of CA) (P > 0.05). The effect of EDTA on the inorganic content was not concentration and time dependent (P > 0.05). CA resulted in a significantly greater reduction in the inorganic contents compared with the control and EDTA groups (P < 0.05). Regardless of the time, EDTA and CA significantly decreased dentine microhardness compared to the control (P < 0.05) with the greatest reduction in the CA groups (P < 0.05). NaOCl alone was associated with the lowest flexural strength, while none of the other irrigation regimens significantly decreased the flexural strength compared to the control group (P> 0.05). Conclusions Use of 1.5% NaOCl for 5 min decreased the collagen content of samples of human dentine from extracted teeth while EDTA and 10% citric acid mostly affected the inorganic content and microhardness of dentine surfaces. None of the irrigant solutions significantly decreased the mechanical properties of the entire dentine specimen.

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Section: Discussionmentioning

confidence: 88%

Surface and structural changes in root dentine by various chelating solutions used in regenerative endodontics

et al. 2020

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“… b The study by Pedersen et al 30 includes additional SEM analysis for smear layer removal efficacy's evaluation. …”

Section: Resultsmentioning

confidence: 99%

Effects of endodontic irrigation solutions on structural, chemical, and mechanical properties of coronal dentin: A scoping review

Marques,

Falacho,

Santos

et al. 2023

J Esthet Restor Dent

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ObjectiveThis review aims to assess structural, chemical, and mechanical properties of coronal dentin after endodontic irrigation.Materials and MethodsReporting followed the PRISMA extension for scoping reviews. An electronic search was carried out in PubMed, Embase, and Cochrane Library. Records filtered by language and published up to November 4, 2022 were independently screened by two researchers. Studies evaluating structural, chemical, or mechanical properties of human permanent coronal dentin after irrigation within the scope of nonsurgical root canal treatment were included. Data were extracted regarding study type, sample description and size, experimental groups, outcome, evaluation method, and main findings.ResultsFrom the initial 1916 studies, and by adding 2 cross‐references, 11 in vitro studies were included. Seven studies provide ultrastructural and/or chemical characterization, and six assessed microhardness and/or flexural strength. One percent to 8% sodium hypochlorite (NaOCl) and 1%–17% ethylenediaminetetraacetic acid (EDTA) were the most commonly tested solutions, with contact times of 2–240 min (NaOCl) and 1–1440 min (EDTA) being evaluated.ConclusionsOverall, the literature is consensual regarding the inevitable impact of NaOCl and chelating agents on coronal dentin, with both deproteinizing and decalcifying effects being concentration‐ and time‐dependent. The alteration of mechanical parameters further confirmed the surface and subsurface ultrastructural and chemical changes.Clinical SignificanceEndodontic treatment success highly depends on restorative sealing. Understanding the result of exposing coronal dentin, the main substrate for bonding, to irrigants' action is crucial. The deproteinizing and decalcifying effects of NaOCl and chelating agents are both concentration‐ and time‐dependent, causing surface and subsurface ultrastructural, chemical, and mechanical alterations.

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“…This may be attributed to the physiochemical changes related to the aging process of dentin represented by increase in inorganic part of mineral content and decrease in organic part of collagen. Deposition of peritubular dentin increases leading to the narrowing of the dentinal tubules and complete obliteration of others which has a direct effect on the efficacy of the irrigating solutions (1) . Laser irradiation can cause morphological and chemical alterations in dentin represented by the evaporation of the dentin organic matrix leaving pores and spaces (29) .…”

Section: Discussionmentioning

confidence: 99%

“…These modifications take place until the majority of tubule lumens have calcified and the sclerotic tissue is apparent. Changes in mechanical parameters like fracture resistance, flexure strength, and microhardness are also recorded, in addition to microstructural changes (1) .…”

Section: Introductionmentioning

confidence: 99%

Effect of Irradiation with 980-nm Diode Laser on the Microhardness of Young and Old Root Canal Dentin after Treatment with Chemical Solutions

Ghazy

Fawzy²,

Abdelkafy³

2022

ADJ-for Girls

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Purpose:The purpose of this study was to evaluate the effect of diode laser-980nm on microhardness of young and old canal dentin after treatment with NaOCl, NaOCl/ EDTA and distilled water solutions. Material and Methods Forty-eight single rooted premolars were divided into three groups according to the chemical solutions used (16 each) (8 for young teeth <30 years old and 8 for old teeth >50 years old). Group I: irrigated with 5ml of 2.6% NaOCl activated with diode laser, group II: irrigated with 5ml of 2.6% NaOCl without laser activation followed by 5ml of 17% EDTA activated with diode laser and group III: irrigated with 5ml of distilled water activated with diode laser. Then microhardness was evaluated at coronal, middle, and apical thirds of each root canal. Results: In all young and old groups, the coronal third had the highest mean value, followed by the middle, and the apical third had the lowest mean value, with a statistically significant difference between thirds of the groups (p0.001<). There was a statistically significant difference between young and old teeth at all levels (coronal, middle, and apical) for each group (I, II, and III), with old teeth having a greater mean microhardness value than young teeth. Conclusion: Irradiation of NaOCl/EDTA solutions with 980-nm diode caused reduction in microhardness of young dentin more than old dentin, and NaOCl only or distilled water in all thirds of groups.

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Influence of different irrigation protocols on microhardness and flexural strength values of young and aged crown dentin

Cited by 7 publications

References 36 publications

Surface and structural changes in root dentine by various chelating solutions used in regenerative endodontics

Surface and structural changes in root dentine by various chelating solutions used in regenerative endodontics

Effects of endodontic irrigation solutions on structural, chemical, and mechanical properties of coronal dentin: A scoping review

Effect of Irradiation with 980-nm Diode Laser on the Microhardness of Young and Old Root Canal Dentin after Treatment with Chemical Solutions

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