Scanning Electron Micrograph and Surface Hardness of Mineral Trioxide Aggregate in the Presence of Alkaline pH

Saghiri, Mohammad Ali; Lotfi, Mehrdad; Saghiri, Ali Mohammad; Vosoughhosseini, Sepideh; Aeinehchi, M.; Ranjkesh, Bahram

doi:10.1016/j.joen.2009.01.017

Cited by 42 publications

(37 citation statements)

References 33 publications

(41 reference statements)

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“…Thus, it is hypothesized that MTA may be used to prevent or arrest tooth resorption. On the other hand, the effect of alkaline and acidic pH values on physical properties of WMTA has been well documented (18,19). However, the effect of bleaching agents on WMTA, when used as a protective barrier over the root canal filling, is disputed.…”

Section: Introductionmentioning

confidence: 99%

Microleakage comparison of glass-ionomer and white mineral trioxide aggregate used as a coronal barrier in nonvital bleaching

Vosoughhosseini

Lotfi²,

Shahmoradi³

et al. 2011

Med Oral

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Objectives: There is some evidence that the pH at the root surface is reduced by intracoronal placement of bleaching pastes, which is known to enhance osteoclastic activity. Therefore, it is recommended that a protective barrier be used over the canal filling to prevent leakage of bleaching agents. Glass-ionomer (GI) is commonly used as a coronal barrier before nonvital bleaching. Because mineral trioxide aggregate (MTA) creates high alkalinity after mixing with water, using MTA as a protective barrier over the canal filling may not only prevent leakage of bleaching agents and microorganisms, but may prevent cervical resorption. The aim of this study was to evaluate sealing ability of white mineral trioxide aggregate (WMTA) as a coronal barrier before nonvital bleaching. Study design: Root canals of one hundred thirty human maxillary incisors were instrumented and filled with gutta-percha without sealer. Gutta-percha was removed up to 3 mm below the cementoenamel junction (CEJ). The teeth were randomly divided into six experimental groups of 20 teeth each and two control groups of 5. In three experimental groups, WMTA was packed into the canal to the level of CEJ. In the remaining experimental groups, glass-ionomer (GI) was used as a coronal barrier. After a 24-hour incubation period, one of the following three bleaching agents was placed in the access cavity of each of the WMTA or GI groups. These three bleaching agents were 30% hydrogen peroxide, sodium perborate mixed with 30% hydrogen peroxide, and sodium perborate mixed with distilled water. The bleaching agents were replaced every 3 days for three times. In the positive controls, no Comparison of glass-ionomer and white mineral trioxide aggregate used as a coronal barrier e1018 coronal barrier was used. In the negative controls, all the tooth surfaces were covered by two layers of nail varnish. Microleakage was evaluated using protein leakage test. Statistical analyses were performed with the Kruskal-Wallis and Mann-Whitney tests.Results: The experimental groups showed minimum leakage which was not significantly more than tha in the negative controls. There was no statistically significant difference in leakage between the experimental groups (p<0.05).Conclusions: This study indicated that different bleaching agents have no effect on sealing ability of WMTA.

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Section: Introductionmentioning

confidence: 99%

Microleakage comparison of glass-ionomer and white mineral trioxide aggregate used as a coronal barrier in nonvital bleaching

Vosoughhosseini

Lotfi²,

Shahmoradi³

et al. 2011

Med Oral

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show abstract

“…The surface hardness of MTA was significantly reduced in an acidic environment (6)(7)(8) together with reduced compressive (9) and diametral strength (7). However, a pH of 8.4 to 9.4 could enhance the hardness of MTA (10).…”

mentioning

confidence: 98%

The Effect of Acidity on Dislodgment Resistance of Mineral Trioxide Aggregate and Bioaggregate in Furcation Perforations: An In Vitro Comparative Study

Hashem¹,

Amin²

2012

Journal of Endodontics

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“…In this study, we eliminated the effect of mechanical obstacle by refusing to place the alkaline source directly into the root canals and just apical surfaces of WMTA were exposed to different alkaline pH values. Saghiri et al (18) showed that at pH values of 8.4 and 9.4 the amount of unhydrated WMTA decreases and the surface hardness, as an indicator of the setting process, increases and if WMTA is exposed to pH values higher than 9.4 adverse effects might result. In this study WMTA showed significantly greater leakage at a pH value of 10.4; therefore, it appears that microleakage of WMTA has a linear relationship with the amount of unhydrated cement in the presence of high pH values.…”

Section: Discussionmentioning

confidence: 99%

Effect of alkaline ph on sealing ability of white mineral trioxide aggregate

Lotfi

Vosoughhosseini²,

Saghiri³

et al. 2011

Med Oral

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Objectives: The aim of this study was to evaluate microleakage of white mineral trioxide aggregate (WMTA) after its exposure to a range of alkaline environments during hydration. Study Design: Seventy single-rooted teeth were divided into 4 experimental and 2 control groups. All the teeth were instrumented, and their apices were resected. Root-end cavities were filled with WMTA in the experimental groups. In the control groups, root-end cavities were not filled. Root-end fillings were exposed to alkaline environments with pH values of 7.4, 8.4, 9.4, or 10.4 for 3 days. Microleakage was evaluated by bovine serum albumin. Evaluations were carried out at 24-hour intervals for 80 days. Data were analyzed by one-way analysis of variance and a post hoc Tukey test at the 0.05 level of confidence. Results: The number of days (mean ± standard deviation) needed for color change at pH values of 7. 4, 8.4, 9.4, and 10.4 were 78.53 ± 5.68, 80.00 ± 0.00, 68.93 ± 19.00, and 34.46 ± 12.73, respectively. The time needed for leakage to occur was significantly shorter in samples stored at a pH value of 10.4 (P<0.001). Conclusions: Within the limits of this study, it can be concluded that pH values greater than 9.4 may jeopardize the sealing ability of WMTA during hydration.

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Scanning Electron Micrograph and Surface Hardness of Mineral Trioxide Aggregate in the Presence of Alkaline pH

Cited by 42 publications

References 33 publications

Microleakage comparison of glass-ionomer and white mineral trioxide aggregate used as a coronal barrier in nonvital bleaching

Microleakage comparison of glass-ionomer and white mineral trioxide aggregate used as a coronal barrier in nonvital bleaching

The Effect of Acidity on Dislodgment Resistance of Mineral Trioxide Aggregate and Bioaggregate in Furcation Perforations: An In Vitro Comparative Study

Effect of alkaline ph on sealing ability of white mineral trioxide aggregate

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