The Effect of Calcium Hydroxide and Nano–calcium Hydroxide on Microhardness and Superficial Chemical Structure of Root Canal Dentin: An Ex Vivo Study

Naseri, Mandana; Eftekhar, Leila; Gholami, Farshid; Atai, Mohammad; Dianat, Omid

doi:10.1016/j.joen.2019.06.002

Cited by 39 publications

(48 citation statements)

References 31 publications

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“…Vickers microhardness test (VHT) is suitable for determining the hardness of brittle materials, such as tooth structure. Previous studies have used VHT for the evaluation of the effect of irrigation solutions, root canal medicaments and root canal sealers on the root canal dentine microhardness (Amaral et al 2018, Baras et al 2019, Naseri et al 2019. In the present study, the microhardness of root canal dentine was decreased by the chelating solutions, while the mechanical strength of bulk dentine did not change.…”

Section: Discussionsupporting

confidence: 45%

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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: Discussionsupporting

confidence: 45%

“…The use of microhardness tests to determine the mineral content and mechanical strength of root canal dentine is a common approach used in the literature (Yassen et al 2014, Yilmaz et al 2016, Naseri et al 2019. Vickers microhardness test (VHT) is suitable for determining the hardness of brittle materials, such as tooth structure.…”

Section: Discussionmentioning

confidence: 99%

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

et al. 2020

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“…In general, there is a consensus that before definitive filling, the sequelae of reimplantation must be under control, and the periapical tissues must be completely repaired (Panzarini et al, 2012). The long-term use of Ca(OH)2 medication should be avoided in teeth with damage to the root surface, since Ca(OH)2 can lead to dentin fragility (Naseri, Eftekhar, Gholami, Atai & Dianat 2019) and favor the appearance of ankylosis with external root resorption (Lengheden, Blomlö, & Lindskog 1991). However, Ca(OH)2 remains the most widely used dressing due to its biological properties (Panzarini et al, 2012; Mohammadi & Dummer 2011) being usually prepared by agglutination with an aqueous or viscous vehicle.…”

Section: Discussionmentioning

confidence: 99%

Traumatic dental injures on maxillary incisors and its sequelae after 22-years follow-up: a case report

Souza

Azevedo

Rangel

et al. 2020

RSD

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Avulsion of a permanent tooth is a serious condition and a true dental emergency that can be associated with other traumatic injuries. In addition, in reimplanted avulsed teeth, ankylosis and external replacement resorption (ERR) are two typical biological responses, with long-term progression and outcome associated with the patient's growth stage. The purpose of this report is to present the long-term outcome of an 18-year-old patient who was the victim of a motor vehicle traffic accident that resulted in traumatic injury to the maxillary incisors, including an avulsed central incisor with extensive external replacement resorption (tooth 11). Twenty-two years later, due to the continuous effect of the ERR process on the reimplanted tooth and favorable bone weight, it was decided to perform rehabilitation with immediate guided implant by a simplified method (KEA-TECH system). In young patients, the decision to maintain the tooth even under unfavorable conditions may delay rehabilitation with implants.

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“…These results were logical, and the rationale for that is CaOnanoparticles possess Ca in its chemical composition. Mixing of CaO with water resulted in the production of calcium hydroxide [27] , which was proved to be an effective remineralising agent [28] . It was stated that, in the presence of biological fluid, the calcium hydroxide permitting the development of biological apatite [24] .…”

Section: Discussionmentioning

confidence: 99%

Demineralisation Resistance by Bonding Agent Containing Calcium Oxide-Nanoparticles

2020

MLU

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Aim: This study aimed to quantify the effectiveness of bonded Calcium oxide (CaO)-nanoparticles as a demineralisation inhibitor.Methodology: Twelve specimens of enamel were subjected to demineraisation-remineralisation cycles following the application of a bonding agent with or without CaO-nanoparticles. Calcium (Ca), and phosphorus (P) contents were evaluated utilising energy-dispersive X-ray spectroscopy (EDS). An independent sample t-test was performed to examine the statistical difference between CaO group and control one.Results: The CaO group showed higher Ca wt% (67.59 ± 1.68) than the control group (65.22 ± 0.47) with significant difference (p = 0.017). Conclusion:Application of bonding agent containing CaO-nanoparticles could enhance the enamel resistance against cariogenic challenge.

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The Effect of Calcium Hydroxide and Nano–calcium Hydroxide on Microhardness and Superficial Chemical Structure of Root Canal Dentin: An Ex Vivo Study

Cited by 39 publications

References 31 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

Traumatic dental injures on maxillary incisors and its sequelae after 22-years follow-up: a case report

Demineralisation Resistance by Bonding Agent Containing Calcium Oxide-Nanoparticles

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