Authors : Murali Krishna Raju Saripella, Ravi Kumar Konagala, Anupreeta A, Lakshman Varma U,, Ramesh P
DOI : 10.18231/j.aprd.2020.020
Volume : 6
Issue : 2
Year : 2020
Page No : 94-99
Background: Success in endodontic therapy depends on effective chemomechanical preparation of the
root canal, but their compromising effects on root dentin microhardness should be taken into consideration.
AIM: To evaluate the effect on microhardness of root dentin prepared with hand stainless steel K-Files,
ProTaper and K3 NiTi Rotary file systems with 2.5% Sodium Hypochlorite as common irrigating solution.
Materials and Methods : Fifty human mandibular single-rooted premolar teeth selected. Access opening
was done and working length was determined. All the specimens were then randomly divided into five
groups with 10 specimens in each group. Group I- Neither instrumented nor irrigated. Group II- 2.5%
NaOCl irrigation Group III- Stainless steel K-files using 2.5% NaOCl Group IV- ProTaper rotary files
using 2.5% NaOCl solution. Group V - K3 rotary files using 2.5% NaOCl solution. The specimens were
prepared for microhardness testing at a distance of 500 mm and 1000 mm from the lumen of each sample
using vickers microhardness test.
Results: 1) Significant difference in microhardness values were seen at 500 mm and 1000 mm (P<0>
from the lumen in all groups. 2) Statistically significant differences were seen among all the groups except
between Group IV & V.
Conclusion: Instrumentation with NiTi Rotary files affected dentin microhardness significantly to a lesser
extent when compared to Stainless Steel K files using 2.5% NaOCl irrigating solution.
Keywords: Microhardness, Sodium hypochlorite, Nickel Titanium Rotary files.,