Evaluación de los cambios estructurales de la lima Primary del sistema Wave One Gold sometidos a procesos de esterilización química y por calor húmedo

Abstract

Nickel Titanium (NiTI) files offer greater elasticity and adaptation to the morphology of root canals, allowing better preparation and shaping of this system.NiTi instruments with heat treatment and reciprocating movement were recently introduced on the market with the WaveOne Gold (WOG) system (Dentsply Tulsa Dental Specialties, Tulsa, OK, USA), these instruments have the ability to provide better resistance to cyclical fatigue and twisting, which together with their high cost have led to reuse of these and be subjected to stylization processes. The objective of this research is to describe the macroscopic structural changes of the Primary files of the Wave One Gold system subjected to chemical and moist heat sterilization processes, after performing different cycles of instrumentation on natural teeth. Materials and methods: 22 Primary files (07/25) of the Wave One Gold system (Dentsply, Maillefer, Switzerland) were used, which were randomly assigned in 3 different groups, Group I, Group II and Groups III control group, All the Files were subjected to an instrumentation process and subsequent sterilization cycle according to the assigned group, then they were photographed with a digital camera (6D EOS Mark II, Cannon) and a 100mm macro lens (EF 100mm / FLLS USM Macro Lens, Cannon) to be evaluated. Results: obtained showed alterations in 100% of the samples after instrumenting an average of 20 canals per file in each group and carrying out the corresponding cycle of chemical or humid heat sterilization. These changes were observed in 19 (95.0%) instruments. mainly between uses 16-20. Conclusion: All Primary files of the Wave One Gold system analyzed in this study showed structural changes after instrumenting an average of 20 canals and 19 sterilization cycles, regardless of the sterilization method performed.