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

Published in final edited form as: Acta Biomater. 2014 Apr 13;10(7):3327–3334. doi: 10.1016/j.actbio.2014.04.006

Table I. Comparison of gray and white varieties of ProRoot MTA and MTA Plus.

Characteristics	White ProRoot MTA	Gray ProRoot MTA	White MTA Plus	Gray MTA Plus
Liquid		Water	Water-based gel with water-soluble thickening agents and polymers ^a

Powder:liquid ratio (by weight)		3:1	Variable from 1:1 to 4:1 depending on indication

Primary Phases	3CaO·SiO₂	3CaO·SiO₂	3CaO·SiO₂	3CaO·SiO₂
	2CaO·SiO₂	2CaO·SiO₂	2CaO·SiO₂	2CaO·SiO₂
	Bi₂O₃ ^b	Bi₂O₃ ^b	Bi₂O₃ ^b	Bi₂O₃ ^b
	3CaO·Al₂O₃	3Ca·OAl₂O₃	3CaO·Al₂O₃	3CaO·Al₂O₃
	CaSO₄	CaSO₄	CaSO₄	CaSO₄
		Ca₂(Al,Fe)₂O₅ ^c		Ca₂(Al,Fe)₂O₅ ^c

contents are GRAS (generally regarded as safe);

bismuth oxide added for radiopacity;

calcium aluminoferrite is only present in the gray variety of both cements. It is involved in the hydraulic phase and is more radiopaque than calcium silicate hydrate.