A New Weak Chelator in Endodontics: Effects of Different Irrigation Regimens with Etidronate on Root Dentin Microhardness

Table 1

Mean and standard deviation and 𝑃 values (Student’s t-test) for microhardness analysis in the cervical third before (T0) and after (T1) the application of the irrigation regimens.

Groups	Cervical third (CT)
	T0; X ± SD	T1; X ± SD	P value; (Student’s t-test)
G1: saline	46.6±6.3	46.0±5.2	0.69
G2: mixture 5% NaOCl and 18% HEBP (30 min)	43.7±5.0	36.2±5.4	0.02
G3: 2.5% NaOCl (30 min)	44.7±3.5	38.7±3.8	0.02
G4: 2.5% NaOCl (30 min) + 17% EDTA (3 min)	47.5±6.4	30.7±3.5	<0.0001
G5: 2.5% NaOCl (30 min) + 10% CA (3 min)	43.7±3.4	31.5±4.9	<0.0001
G6: 2.5% NaOCl (30 min) + 9% HEBP (5 min)	45.9±4.8	41.4±4.9	0.04
G7: 2.5% NaOCl (30 min) + 17% EDTA (3 min) + 2.5% NaOCl (3 min)	47.5±6.4	30.2±3.91	<0.0001
G8: 2.5% NaOCl (30 min) + 10% CA (3 min) + 2.5% NaOCl (3 min)	43.7±1.8	31.9±6.8	<0.0001
G9: 2.5% NaOCl (30 min) + 9% HEBP (5 min) + 2.5% NaOCl (3 min)	45.9±4.8	39.1±4.76	0.02

X: mean; SD: standard deviation.