الفهرس 
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Abstract
The objective of this study was to evaluate the effect of different concentrations
of NaOCl with and without passive ultrasonic irrigation (PUI) on mechanical
properties of human dentin for applications in regenerative endodontics (RE).
Sixty single-rooted teeth were sectioned into 2 halves (n = 120). Dentin bars
were produced from one half for flexural strength and the other half was used
for microhardness. Specimens were randomly assigned into 10 groups: G1 and
G2 (control): distilled water for 30 and 60 min, respectively; G3: 1.5%NaOCl
for 30 min; G4:1.5%NaOCl for 60 min; G5: 1.5%NaOCl + PUI for 30 min; G6:
1.5%NaOCl + PUI for 60 min; G7: 5.25%NaOCl for 30 min; G8: 5.25%NaOCl
for 60 min; G9: 5.25%NaOCl + PUI for 30 min; G10: 5.25%NaOCl + PUI for
60 min. An increase in NaOCl concentration showed highly significant reduction
in mechanical properties. There was no significant difference between
1.5% NaOCl and control group except for specimens treated with PUI for
60 min. NaOCl in concentrations recommended for RE did not have a significant
effect on mechanical properties of dentin. However, PUI with increased
irrigation time might have an effect even with low NaOCl concentration.