Avaliação do preparo de canais radiculares ovais por instrumentos de níquel-titânio: estudo por microtomografia computadorizada

Abstract

Successful endodontic treatment depends on cleansing and shaping the root canal system (SCR). Objective: To evaluate the efficiency of two nickel-titanium file systems in the preparation of oval root canals for volume variation, surface area and unprepared walls by means of computed microtomography (micro-CT) along the canal. and 5mm from the root apex, as well as the transport and centralization of the canal. Material and Methods: Forty single-canal oval canines were selected and paired in two groups (n = 20) according to the instrumentation system used: XP-endo Shaper and Mtwo. The teeth were scanned by micro-CT before and after instrumentation, which was performed by a single endodontist and using a thermal vat at 37 ° C. The evaluation of the analyzed parameters was performed by image processing and overlay. Results: in the apical third, there was a significant difference between the groups (p <0.05 - Mann-Whitney). While XP-endo Shaper had higher volume and surface area, Mtwo showed higher percentage of unprepared walls. Considering the canal in all its extension, there was no difference between the groups (p> 0.05). When comparing the apical third and canal evaluations over the fullest extent, a difference (p <0.05 - Wilcoxon) was found in the variation of surface area, volume and walls not prepared for XP-endo Shaper and Mtwo, with higher values for the apical third. Conclusion: The XP-endo Shaper system was more effective in the instrumentation of oval canals when compared to the Mtwo system, producing greater volume increase, surface area and a smaller percentage of unprepared canals in the canals. Regarding the apical transport and preparation centralization, there was no statistical difference between the evaluated instruments (p> 0.05).