Comparison of Setting Time of White Mineral Trioxide Aggregate with and without Disodium Hydrogen Phosphate at Different Liquid-to-powder Ratios.

Autor: Mokhtari H; Department of Endodontics, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Islamic Republic of Iran., Lotfi M; Department of Endodontics, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Islamic Republic of Iran., Rahbar M; Department of Operative and Esthetic Dentistry, Faculty of Dentistry, Dental School, Dental and Periodontal Research Center, Tabriz University of Medical Sciences, Tabriz, Islamic Republic of Iran., Mozafari A; Department of Endodontics, Faculty of Dentistry, Zanjan University of Medical Sciences, Zanjan, Islamic Republic of Iran, Phone: +982433471161, e-mail: aisanmozaffary@gmail.com., Badri-Nozadi MH; Department of Endodontics, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Islamic Republic of Iran., Mokhtari-Zonouzi HR; Department of Endodontics, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Islamic Republic of Iran.
Jazyk: angličtina
Zdroj: The journal of contemporary dental practice [J Contemp Dent Pract] 2018 Aug 01; Vol. 19 (8), pp. 988-991. Date of Electronic Publication: 2018 Aug 01.
Abstrakt: Aim: The present study was conducted with the objective of evaluating the effect of different liquid-to-powder ratios on setting time of white mineral trioxide aggregate (WMTA) and the effect of adding disodium hydrogen phosphate (Na 2 HPO 4 ) to white MTA (NAMTA).
Materials and Methods: Sixty samples were prepared in plastic annular molds with a diameter of 10 mm and a height of 2 mm in order to record setting time where white MTA was placed in 30 samples and 2.5 wt% mixture of Na 2 HPO 4 with white MTA was placed in other 30 samples. Setting times in different ratios of liquid to powder (50, 60, and 70%) and at different times including 5, 10, 15, 20, 25, 30, 40, and 50 minutes as well as 1, 1.5, 2.5, 3, 3.5, and 4 hours were measured with Vicat. Statistical Package for the Social Sciences version 16 software was used to examine the differences between groups. The values of p < 0.05 were considered to be statistically significant in this study.
Results: The average setting time of samples in two WMTA and NAMTA was 182.17 ± 57.86 and 67.00 ± 14.42 respectively, and this difference was statistically significant (p < 0.001). Also, the average setting time of samples in ratio groups of 50, 60, and 70% were 146.00 ± 75.90, 85.00 ± 31.71, and 142.5 ± 64.47 respectively, and results showed that there was no significant difference between groups.
Conclusion: Adding 2.5 wt% of Na 2 HPO 4 mixture to white MTA reduces the setting time, which is lower than the WMTA in 50, 60, and 70% liquid-to-powder ratios.
Clinical Significance: According to the findings of this study, it can be seen that adding Na 2 HPO 4 to white MTA is a good way to reduce setting timing in clinical dentistry, especially in one-visit treatments.
Databáze: MEDLINE
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