. Author manuscript; available in PMC: 2015 Feb 1.

Published in final edited form as: J Endod. 2013 Aug 31;40(2):255–260. doi: 10.1016/j.joen.2013.07.009

Table.

Comparison of gray and white versions of ProRoot MTA^® and MTA Plus™

Characteristic	White ProRoot® MTA	Gray ProRoot® MTA	MTA Plus™	Grey MTA Plus™
Liquid	Water	Water	Water-based gel with water-soluble thickening agents & polymers^*	Water-based gel with water-soluble thickening agents & polymers^*
Powder:Liquid ratio (by weight)	3:1	3:1	Variable from 1:1 to 4:1 depending on indication	Variable from 1:1 to 4:1 depending on indication
Primary Phases	3CaO·SiO₂, 2CaO·SiO₂, Bi₂O_3,, 3CaO·Al₂O₃ CaSO₄	3CaO·SiO₂, 2CaO·SiO₂, Bi₂O_3,, 3CaO·Al₂O₃ CaSO₄, Ca₂(Al,Fe)₂O₅	3CaO·SiO₂, 2CaO·SiO₂, Bi₂O_3,, 3CaO·Al₂O₃ CaSO₄	3CaO·SiO₂, 2CaO·SiO₂, Bi₂O_3,, & 3CaO·Al₂O₃ CaSO₄ Ca₂(Al,Fe)₂O₅

Contents are GRAS (generally regarded as safe)

Note: Calcium aluminoferrite (Ca₂(Al,Fe)₂O₅) is only present in the gray version of both cements. After setting, hydrated calcium silicates form with calcium hydroxide.