Compressive Strength and Setting Time of MTA and Portland Cement Associated with Different Radiopacifying Agents

Tanomaru‐Filho, Mário; Morales, Vanessa; Silva, Guilherme; Bosso, Roberta; Reis, José M. S. N.; Duarte, M. A. H.; Guerreiro-Tanomaru, Juliane Maria

doi:10.5402/2012/898051

Cited by 31 publications

(26 citation statements)

References 23 publications

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“…According to Islam et al,33 this is due to the continuous setting of material, which leads to increased strength and stability. A 24-hour compressive strength of angelus MTA in this study is consistent with the study of Kogan et al 41 The 24-hour and 30-day compressive strengths of angelus MTA in the study are not consistent with the studies of Chung et al 44 and Tanomaru-Filho et al 45 In the study of Chung et al, 44 MTA compressive strength in 24 hours has been reported to be about 18 MPa, which is much lower compared with the number reported in our study (30 MPa). There are differences in the test method: plastic generators with a diameter of 4 mm and a height of 8 mm each have been used in that study.…”

Section: Discussionsupporting

confidence: 74%

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Comparison of Compressive Strength and Setting Time of Four Experimental Nanohybrid Mineral Trioxide Aggregates and Angelus Mineral Trioxide Aggregate

Rahbar¹,

Tabari²,

Safyari³

et al. 2017

World Journal of Dentistry

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Aim: The present study was carried out with the objective of comparing the compressive strength and setting time of four experimental nanohybrid mineral trioxide aggregates (MTAs) and angelus MTA. Materials and methods:In this research, four experimental formulations of nanohybrid MTA (groups are with the base of Portland cement, containing nanoparticles of zirconia, aluminum oxide, titanium, nanosilica, and gypsum and bismuth trioxide) and angelus MTA were compared. Powder and water were mixed with the ratio determined by a factory for angelus MTA and were mixed at a ratio of 3:1 in experimental samples until the consistency of putty was reached. These were then placed in stainless steel cylinder generators, with a diameter of 4 mm and a height of 6 mm, for testing compressive strength, and in generators with a diameter of 10 mm and height of 2 mm to test setting time. The samples prepared were tested after 24 hours and a month using a strength-testing machine. A 135 G needle was used to test the initial setting time in the prepared samples, and a 456.5 G needle was used to test the final setting time. In the end, data were analyzed using Statistical Package for the Social Sciences (SPSS) software.Results: Experimental nanohybrid MTA P significantly showed the minimum setting time and experimental nanohybrid MTA Q showed the maximum setting time in 30 days (p < 0.05). Angelus MTA had greater compressive strength than the experimental materials in 24 hours. Clinical significance: Considering that experimental MTAs showed less setting time compared with the commercial type, experimental MTAs can be deployed in clinical usage. Conclusion

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Section: Discussionsupporting

confidence: 74%

“…In the study of Tanomaru-Filho et al, 45 24-hour and 21-day strengths are roughly half the amount reported in our study. There were differences in the method of experiments with this study.…”

Section: Discussionsupporting

confidence: 47%

Comparison of Compressive Strength and Setting Time of Four Experimental Nanohybrid Mineral Trioxide Aggregates and Angelus Mineral Trioxide Aggregate

Rahbar¹,

Tabari²,

Safyari³

et al. 2017

World Journal of Dentistry

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“…However, it is related that this substance interferes with the hydration mechanism of MTA and calcium hydroxide precipitation in the hydrated cement 7) . Furthermore, the association of BO changes the microstructure of the cement matrix 8) , and increases the porosity and solubility of the Portland cement reducing its resistance 8,9) .…”

Section: Introductionmentioning

confidence: 99%

“…Also, ZrO2 associated with PC presents radiopacity, compressive strength, setting time, water absorption and solubility similar to ProRoot MTA ®13) . TanomaruFilho et al 9) evaluated the compressive strength and setting time of MTA and PC associated with bismuth oxide, ZrO 2, calcium tungstate, showing that all radiopacifying agents may be used in association with PC to replace bismuth oxide. Camilleri et al 14) reported that the hydration reaction of 30% of ZrO2 added to PC produces calcium silicate hydrate, calcium hydroxide and a minimum amount of monosulfate and ettringite (hydrous calcium aluminum sulfate mineral) and, thus, does not affect the hydration mechanism.…”

Section: Introductionmentioning

confidence: 99%

Radiopacity, pH and antimicrobial activity of Portland cement associated with micro- and nanoparticles of zirconium oxide and niobium oxide

et al. 2014

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The aim of this study was to evaluate some properties of the calcium silicate materials Mineral Trioxide Aggregate (MTA) and Portland cement (PC) with microparticulated (micro) and nanoparticulated (nano) zirconium oxide (ZrO 2 ) or niobium oxide (Nb 2 O 5 ). The experimental materials: White PC (PC), MTA-Angelus ® (MTA), PC+ZrO 2 micro, PC+ZrO 2 nano, PC+Nb 2 O 5 micro and PC+Nb 2 O 5 nano were submitted to radiopacity and pH evaluations. Furthermore, the antimicrobial activity against different microorganisms was assessed by agar diffusion test. MTA presented higher radiopacity than other materials. However, all materials except PC presented higher radiopacity than recommended by ISO/ADA. MTA promoted higher pH values in all analyzed periods (p≤0.05). At the initial periods, PC and PC+ZrO 2 micro showed pH similar to MTA. All materials showed antimicrobial activity against the evaluated microorganisms. In conclusion, ZrO 2 and Nb 2 O 5 could be alternative radiopacifiers to be added to calcium silicate materials.

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“…Although radiopacifiers are not reagents of the hydration setting reaction, they can change or impede the setting reaction leading to some changes to the physical properties of the set cement (40)(41)(42). The choice of radiopacifier has other implications, including whether the cement darkens over time or causes darkening of adjacent tooth structure, such as when bismuth oxide is used (43).…”

Section: Radiopacifiermentioning

confidence: 99%

Classification and Nomanclature of Commercial Hygroscopic Dental Cements

Ha¹,

Kahler²,

Walsh³

2017

Eur Endod J

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Objective: Under the Global Medical Device Nomenclature (GMDN) system, the newly introduced term 'hygroscopic dental cement' (HDC) encompasses MTA as well as cements based on bioceramics, calcium silicate or calcium sulphate. Many HDCs have a long history of use in dentistry. There is a need for a consistent, logical and informed approach to the nomenclature of traditional and novel HDCs. Methods: Commercial manufacturers of HDC were contacted requesting information on the compositions of products. Manufacturers that were unknown to the authors, that were unable to be contacted, that wished to be excluded from this paper, or that did not send their information on compositions in due time were not included. Results:The compositions of commercial HDCs include various hybrids of calcium silicates, calcium aluminates, calcium phosphates, calcium sulphate as well as zinc sulphates. Furthermore, there are variations in the radiopacifier as well as additives that change the handling or setting processes. Conclusion:The inclusion of different additives to HDCs enables variation in handling properties such that they now exist as distinct putties and sealers as well as cements.

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Compressive Strength and Setting Time of MTA and Portland Cement Associated with Different Radiopacifying Agents

Cited by 31 publications

References 23 publications

Comparison of Compressive Strength and Setting Time of Four Experimental Nanohybrid Mineral Trioxide Aggregates and Angelus Mineral Trioxide Aggregate

Comparison of Compressive Strength and Setting Time of Four Experimental Nanohybrid Mineral Trioxide Aggregates and Angelus Mineral Trioxide Aggregate

Radiopacity, pH and antimicrobial activity of Portland cement associated with micro- and nanoparticles of zirconium oxide and niobium oxide

Classification and Nomanclature of Commercial Hygroscopic Dental Cements

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