TABLE 2.

Radiographic studies on the prevalence of pulp stones in several populations

	Sample preparation (g)	Setting time (min)	Radiopacity (mm Al)	Solubility (%)	Calcium concentration (mg/l)
PC	0.55±0.02a	92.0±1.00a	1.59±0.05a	1.83±0.42a	31.86±5.6a
PC 2%	0.52±0.01a	106.0±1.00b	2.06±0.15a	1.89±0.91a	30.55±7.0a
PC 5%	0.53±0.04a	106.3±1.15b	2.88±0.23b	2.44±1.78a	28.32±4.0a
PC 10%	0.54±0.02a	125.3±2.08c	3.68±0.39c	1.86±1.8a	30.61±8.3a
PC 15%	0.56±0.03a	123.3±1.53c	4.46±0.05d	1.44±0.31a	28.30±2.2a
MTA	-	22.0±1.00d	4.86±0.19d	2.86±1.76a	25.25±4.5a

PC: Portland cement, PC 2%: Portland cement plus 2 wt% of bismuth carbonate, PC 5%: Portland cement plus 5 wt% of bismuth carbonate, PC 10%: Portland cement plus 10 wt% of bismuth carbonate, PC 15%: Portland cement plus 15 wt% of bismuth carbonate, MTA: mineral trioxide aggregate, Different superscript letter represent statistical differences between groups (P<0.05)