Table 5.

The mean, standard deviation (SD) values and results of Kruskal-Wallis and Mann-Whitney U tests for comparison between hard tissue formation scores of different groups, subgroups and subdivisions

Time	Intra-canal propolis paste		Intra-canal TAP paste		Positive control	Negative control	P-value
	Propolis plug	MTA plug	Propolis plug	MTA plug
	Mean ± SD	Mean ± SD	Mean ± SD	Mean ± SD	Mean ± SD	Mean ± SD
2 W	0.50B ± 0.23	0.67B ± 0.42	0.60B ± 0.41	0.63B ± 0.28	0.00 ± 0.00	0.68B ± 0.44	.061
1 M	0.67Ba ± 0.52	0.83Ba ± 0.41	0.65Ba ± 0.34	0.77Ba ± 0.40	0.00b ± 0.00	1.00Ba ± 0.00	<.001*
2 M	1.17Ab ± 0.41	1.50Ab ± 0.55	1.30Ab ± 0.60	1.55Ab ± 0.65	0.00c ± 0.00	2.0Aa ± 0.61	<.001*
P-value	.040*	.037*	.042*	.038*	1.000	<.001*

*: Significant at P ≤ .05, Different small superscripts in the same row are statistically significantly different. Different capital superscripts in the same column are statistically significantly different. TAP: Triple antibiotic paste, MTA: Mineral trioxide aggregates