Surface Topography and Cutting Efficiency Study of a Preheated Controlled Memory Wire Machined Endodontic File after Exposure to Different Irrigants: An In Vitro Study

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Aim: To examine the effect of seven irrigants on surface topography and cutting efficiency of Mpro files when files are immersed for 10min. Materials and Methods: This was an in vitro study; sixty‐three MPro files were used divided into seven groups (nine each). Groups were immersed in irrigants for 10 min: Group 1 Saline, Group II Curcumin, Group III EDTA 17%, Group IV Lycopene, Group V Chitosan 0.3%, Group VI Chitosan 0.5% and Group VII sodium hypochlorite. Files were inspected by scanning electron microscope and all photomicrographs were reviewed and scored according to the defects found. All previously immersed files were used to prepare plastic blocks with simulative canals to assess cutting efficiency by weight loss technique Data were analyzed using chi‐square, one‐way analysis of variance (ANOVA)/Tukey’s test and linear regression. Results: Groups I, V, and VI showed no defects. Group II showed pitting, fretting blunting, and disruption of cutting edge and residues. Group III showed pitting, blunting, and disruption of cutting edges. Group IV showed pitting, blunt cutting edges, and residues. Group VII showed fretting blunt and disruption of cutting edges, micro fractures, and metal flash. None of groups showed corrosion. Results for the cutting efficiency study showed a significant difference between all groups among which the highest mean of debris cut was recorded by Group V chitosan 0.3% Conclusion: Chitosan 0.3 and 0.5% did not affect the surface topography of Mpro file. Chitosan 0.3% enhanced the file’s cutting efficiency, so can be recommended to be used as irrigation.