Deconvolution of the particle size distribution of ProRoot MTA and MTA Angelus

Figures & data

Figure 1. Normalized particle size distributions for BO and three PC samples of differing size.

Table 1. Particle size distribution of PC and BO libraries, MTA-P and MTA-A.

Sample	d10 (μm)	d50 (μm)	d90 (μm)
BO	4.26	10.34	20.92
PC1 (raw PC)	0.22	9.44	94.38
PC2 (sub-14 μm)	0.21	3.02	13.56
PC3 (sub-8  μm)	0.19	1.73	7.69
MTA-P	1.23	1.99	4.32
MTA-A	4.15	12.76	42.84

Table 2. Energy-dispersive X-ray spectroscopy (EDX) on points in Figure 3.

Image	MTA-P				MTA-A
Point	%
Element	1	2	3	4	1	2	3	4
Bi	77.5	–	80.8	–	86.2	90.2	–	87.2
O	10.0	27.6	7.9	43.3	2.8	2.5	33.5	5.2
Ca	7.2	17.2	7.1	13.3	6.1	6.2	10.4	6.3
Ca	4.2	39.2	3.4	25.4	1.3	1.1	35.6	6.3
Si	1.1	9.8	0.9	7.5	–	–	11.2	–

^aThe presence of carbon is likely from the carbon tape adhesive.

Figure 2. Particle size distribution of MTA-P and MTA-A and the associated deconvoluted components.

Figure 3. SEM images of MTA-P (left) and MTA-A (right). Bismuth oxide (white) and Portland cement particles (grey) particles can be seen. Refer to Table 2 for EDX of four points from each image.