Application of mercury intrusion porosimetry for studying the porosity of mineral trioxide aggregate at two different pH

Saghiri, Mohammad Ali; Asgar, Kamal; Lotfi, Mehrdad; Karamifar, Kasra; Neelakantan, Prasanna; Ricci, John L.

doi:10.3109/00016357.2011.597777

Cited by 26 publications

(27 citation statements)

References 26 publications

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“…Many studies reported similar results and the interference of acidic environment in the setting procedure (35), reduced strength (25), hardness, and the porosity of MTA (10,13). BA had the lowest values in all pH conditions in comparison with WMTA and NWMTA.…”

Section: Discussionmentioning

confidence: 78%

Effect of pH on compressive strength of some modification of mineral trioxide aggregate

Saghiri

Garcı́a-Godoy²,

Asatourian³

et al. 2013

Med Oral

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Objectives: Recently, it was shown that NanoMTA improved the setting time and promoted a better hydration process which prevents washout and the dislodgment of this novel biomaterial in comparison with WTMA. This study analyzed the compressive strength of ProRoot WMTA (Dentsply), a NanoWMTA (Kamal Asgar Research Center), and Bioaggregate (Innovative Bioceramix) after its exposure to a range of environmental pH conditions during hydration. Study Design: After mixing the cements under aseptic condition and based on the manufacturers` recommendations, the cements were condensed with moderate force using plugger into 9 × 6 mm split molds. Each type of cement was then randomly divided into three groups (n=10). Specimens were exposed to environments with pH values of 4.4, 7.4, or 10.4 for 3 days. Cement pellets were compressed by using an Instron testing machine. Values were recorded and compared. Data were analyzed by using one-way analysis of variance and a post hoc Tukey’s test. Results: After 3 days, the samples were solid when probed with an explorer before removing them from the molds. The greatest mean compressive strength 133.19±11.14 MPa was observed after exposure to a pH value of 10.4 for NanoWMTA. The values decreased to 111.41±8.26 MPa after exposure to a pH value of 4.4. Increasing of pH had a significant effect on the compressive strength of the groups (p<0.001). The mean compressive strength for the NanoWMTA was statistically higher than for ProRoot WMTA and Bioaggregate (p<0.001). Moreover, increasing of pH values had a significant effect on compressive strength of the experimental groups (p<0.001). Conclusion: The compressive strength of NanoWMTA was significantly higher than WMTA and Bioaggregate; the more acidic the environmental pH, the lower was the compressive strength. Key words:Compressive strength, mineral trioxide aggregate, Nano.

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Section: Discussionmentioning

confidence: 78%

Effect of pH on compressive strength of some modification of mineral trioxide aggregate

Saghiri

Garcı́a-Godoy²,

Asatourian³

et al. 2013

Med Oral

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“…32 Also, there are concerns regarding the possibility of bacterial ingress by the formation of voids or porosities within MTA and at the MTA/dentin interface after obturation 11 or hydration. 9,10 Therefore, orthograde MTA obturation should be carefully performed to minimize the possible formation of voids/porosities and limited in selected clinical cases until its long-term benefits and prognosis is further confirmed.…”

Section: Discussionmentioning

confidence: 99%

“…MTA has been shown to provide superior sealing 7 and biomineralization ability, 8 despite concerns about the macro- or microporous structure of the material caused by inadequate water-to-powder ratio, insufficient packing or water evaporation. 9,10,11 Indeed, it has been reported that the porosity caused by dissolution of calcium hydroxide within MTA could be ‘self-repaired' by mineral precipitates such as calcium silicate hydrate gel that is formed by the hydration reaction of the material, 12,13 and the tag-like structures formed at the MTA/dentin interface. 14,15 These characteristic structures appear to be important in sealing dentinal tubules and biomineralization of the material.…”

Section: Introductionmentioning

confidence: 99%

Bacterial entombment by intratubular mineralization following orthograde mineral trioxide aggregate obturation: a scanning electron microscopy study

Yoo

Chang

et al. 2014

Int J Oral Sci

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The time domain entombment of bacteria by intratubular mineralization following orthograde canal obturation with mineral trioxide aggregate (MTA) was studied by scanning electron microscopy (SEM). Single-rooted human premolars (n=60) were instrumented to an apical size #50/0.06 using ProFile and treated as follows: Group 1 (n=10) was filled with phosphate buffered saline (PBS); Group 2 (n=10) was incubated with Enterococcus faecalis for 3 weeks, and then filled with PBS; Group 3 (n=20) was obturated orthograde with a paste of OrthoMTA (BioMTA, Seoul, Korea) and PBS; and Group 4 (n=20) was incubated with E. faecalis for 3 weeks and then obturated with OrthoMTA–PBS paste. Following their treatments, the coronal openings were sealed with PBS-soaked cotton and intermediate restorative material (IRM), and the roots were then stored in PBS for 1, 2, 4, 8 or 16 weeks. After each incubation period, the roots were split and their dentin/MTA interfaces examined in both longitudinal and horizontal directions by SEM. There appeared to be an increase in intratubular mineralization over time in the OrthoMTA-filled roots (Groups 3 and 4). Furthermore, there was a gradual entombment of bacteria within the dentinal tubules in the E. faecalis inoculated MTA-filled roots (Group 4). Therefore, the orthograde obturation of root canals with OrthoMTA mixed with PBS may create a favorable environment for bacterial entombment by intratubular mineralization.

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“…These drawbacks taken into consideration by many investigators and include its granular consistency,[2] slow setting time,[3] and porosity. [4] In addition, the sealing ability of MTA in low pH environment has been questioned. In an acidic environment, the sealing properties of MTA might be compromised due to a decrease in surface hardness[5] which can cause lower push-out bond strength.…”

Section: Introductionmentioning

confidence: 99%

The effect of pH on solubility of nano-modified endodontic cements

Saghiri

Godoy

Gutmann³

et al. 2014

J Conserv Dent

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Aims:To evaluate the effect of storage pH on solubility of white mineral trioxide aggregate (WMTA), bioaggregate (BA), and nano WMTA cements.Materials and Methods:Forty-eight moulds randomly allocated into three groups of pH 4.4 (group A), 7.4 (group B), and 10.4 (group C); and one empty as control in each group. Each group was further divided into three subgroups according to the material studied; WMTA, BA, and nano WMTA. The specimens in subgroup A were soaked in butyric acid buffered with synthetic tissue fluid (STF) (pH 4.4), while the samples in subgroups B (pH 7.4) and C (pH 10.4) buffered in potassium hydroxide for 24 h and then the loss of cement was determined. A two-way analysis of variance (ANOVA) and Tukey post-hoc statistical tests were used to detect any statistically significant differences among the groups/subgroups.Results:Statistical analysis has showed the highest solubility in acidic pH for all tested materials. Nano WMTA samples in pH = 10.4 had the lowest and BA samples in pH = 4.4 showed the highest cement loss.Conclusion:The solubility of all tested cements can be jeopardized in acidic environment which might affect on their sealing characteristic in clinical scenario. However, nano WMTA cement due to its small size particles and different additives was capable of producing lower porosity in set material, which resulted in showing more resistance in acidic environment.

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Application of mercury intrusion porosimetry for studying the porosity of mineral trioxide aggregate at two different pH

Abstract: Mercury Intrusion Porosimetry technique is a promising and reliable technique for assessing the porosity of endodontic materials.

Cited by 26 publications

References 26 publications

Effect of pH on compressive strength of some modification of mineral trioxide aggregate

Effect of pH on compressive strength of some modification of mineral trioxide aggregate

Bacterial entombment by intratubular mineralization following orthograde mineral trioxide aggregate obturation: a scanning electron microscopy study

The effect of pH on solubility of nano-modified endodontic cements

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