Document Classification

Section Type: METHODS

Text: The specimens were divided into 12 groups, as follows : group 1 : 5. 25 % NaOCl + Hybrid technique (Valdrighi et al. 1998) ; group 2 : 5. 25 % NaOCl + nickel-titanium (NiTi) rotary technique 4 mm shorter than the apex (by FOP-UNICAMP) ; group 3 : 5, 25 % NaOCl + NiTi rotary technique (Hero 642) ; group 4 : 2. 5 % NaOCl + Hybrid technique ; group 5 : 2. 5 % NaOCl + NiTi rotary technique 4 mm shorter than the apex ; group 6 : 2. 5 % NaOCl + NiTi rotary technique (Hero 642) ; group 7 : 0. 5 % NaOCl + Hybrid technique ; group 8 : 0. 5 % NaOCl + NiTi rotary technique 4 mm shorter than the apex ; group 9 : 0. 5 % NaOCl + NiTi rotary technique (Hero 642) ; group 10 : sterile saline solution + Hybrid technique ; group 11 : sterile saline solution + NiTi rotary technique 4 mm shorter than the apex ; group 12 : sterile saline solution + NiTi rotary technique (Hero 642).