Abstract

PRADO, Maíra do; ASSIS, Danielle Ferreira de  and  SIMAO, Renata Antoun. Effects of short-term chemical disinfection on gutta-percha and Resilon surfaces. RFO UPF [online]. 2014, vol.19, n.1, pp. 21-26. ISSN 1413-4012.

Objective: To assess the effect of 5.25% sodium hypochlorite (NaOCl) and 2% chlorhexidine (CHX) solutions on the topography and roughness of gutta-percha and Resilon surfaces. Materials and method: Flat surfaces of gutta-percha and Resilon cones were used. Six groups were assessed: Control GP (CGP) - gutta-percha immersed in distilled water (DW) for 1 minute; CHX GP (CHXGP) - gutta-percha immersed in CHX solution for 1 minute and then washed with DW; NaOCl GP (NGP) - gutta-percha immersed in NaOCl for 1 minute and then washed with DW; Control RE (CR) - Resilon immersed in DW for 1 minute; CHX RE (CHXR) - Resilon immersed in CHX solution for 1 minute and then washed with DW; and NaOCl RE (NR) - Resilon immersed in NaOCl for 1 minute and then washed with DW. Scanning Electron Microscopy (SEM), Energy Dispersive Spectroscopy (EDS), and Profilometry were used to analyze the samples before and after treatment. Roughness values obtained through profilometry were statistically analyzed using Kruskal-Wallis e Mann-Whitney tests (p < 0.05). SEM and EDS findings were qualitatively assessed. Results: The initial and final roughness values were, respectively: CGP - 0.15 ± 0.02/ 0.15 ± 0.01; CHXGP - 0.16 ± 0.02/ 0.15 ± 0.01; NGP - 0.17 ± 0.01/ 0.16 ± 0.02; CR - 0.16 ± 0.01/ 0.16 ± 0.01; CHXR - 0.16 ± 0.01/ 0.16 ± 0.01, and NR - 0.16 ± 0.01/ 0.16 ± 0.01. Statistical analysis revealed no significant changes in roughness values after using decontamination solutions. Additionally, no topographic and chemical changes were observed. Conclusion: Chemical disinfection showed no alteration on gutta-percha and Resilon surfaces.

Keywords : Topography.; Root canal irrigants.; Dental materials.; Endodontics..