Original Research Article
Year: 2020 | Month: July | Volume: 10 | Issue: 7 | Pages: 168-178
Modification of Portland Cement Properties using Glycerin
Manar Abu-Nawarega, Ahmed Zidanb
aKing Abdulaziz University, Faculty of Dentistry, Jeddah, Saudi Arabia and Faculty of Oral and Dental Medicine, Cairo University, Cairo, Egypt.
bFaculty of Dentistry, Umm Al-Qura University, Mekkah, Saudi Arabia and Faculty of Dentistry, October University for Modern Sciences and Arts (MSA), Cairo, Egypt.
Corresponding Author: Manar Abu-Nawareg
ABSTRACT
Objective: The aim of this study was to evaluate the influence of 15% glycerin on the physico-mechanical properties of Portland cement, in an attempt to apply it to mineral trioxide aggregate (MTA).
Materials and Methods: Portland cement, mixed with 10 wt % calcium chloride (CaCl2) as an accelerator, was used in this study. The resultant powder was either mixed with distilled water (PC) or 15% glycerin liquid (PCG). The compressive strength, setting time, cohesion time and anti-washout time of the two cements PC and PCG were tested and compared to those obtained by Biodentine (BD). Furthermore, the internal microstructure of the three tested cements (BD, PC and PCG) was evaluated by scanning electron microscope (SEM).
Results: BD provided the highest compressive strength followed by PCG then PC. The highest setting and cohesion times were exhibited by PC while there was no significant difference between BD and PCG. Regarding the anti-washout time test, PC exhibited the highest value followed by BD while the lowest value was provided by PCG.
Conclusions: Addition of 15% glycerin to Portland cement has improved the setting time, the cohesiveness and the anti-washout ability of the cement with subsequent improvement in the handling properties as well as increasing its compressive strength. This triali s considered to be a successful step which should be performed on Portland cement twin; the MTA.
Key words: Portland Cement, Glycerin, Compressive Strength, Setting Time, Anti wash-out ability, SEM