Table 1. The mean (SD) deviation of push-out in experimental groups .

Groups	Materials	Smear layer	Strength
1	WMTA	Removed	1.44 (0.96) MPa
2	WMTA	-	2.17 (0.72) MPa
3	WMTA+Na2HPO4	Removed	2.98 (1.56) MPa
4	WMTA+Na2HPO4	-	4.54 (1.51) MPa