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

Table 3

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

Groups	Apical third (AT)
	T0; X ± SD	T1; X ± SD	P value; (Student’s t-test)
G1: saline	47.9±6.8	43.7±7.3	0.21
G2: mixture 5% NaOCl and 18% HEBP (30 min)	46.1±3.7	40.0±5.7	0.02
G3: 2.5% NaOCl (30 min)	45.2±2.8	40.7±5.0	0.02
G4: 2.5% NaOCl (30 min) + 17% EDTA (3 min)	47.2±3.6	35.3±4.0	<0.0001
G5: 2.5% NaOCl (30 min) + 10% CA (3 min)	45.4±7.0	30.2±5.4	<0.0032
G6: 2.5% NaOCl (30 min) + 9% HEBP (5 min)	46.4±6.1	39.6±5.8	0.01
G7: 2.5% NaOCl (30 min) + 17% EDTA (3 min) + 2.5% NaOCl (3 min)	47.2±3.6	35.7±5.2	0.0006
G8: 2.5% NaOCl (30 min) + 10% CA (3 min) + 2.5% NaOCl (3 min)	45.1±7.5	28.0±3.6	<0.0005
G9: 2.5% NaOCl (30 min) + 9% HEBP (5 min) + 2.5% NaOCl (3 min)	46.4±6.1	39.4±4.9	0.04

X: mean; SD: standard deviation.