Avaliação da eficácia dos instrumentos Prodesign Logic RT, pro R retratamento e XP-endo Finisher em dentes submetidos ao retratamento endodôntico

Abstract

To improve the efficiency and success of endodontic retreatment, nickel-titanium (NiTi) systems have been developed to provide greater elastic flexibility compared to conventional files. Thus, the aim of this study was to evaluate and compare morphological changes resulting from the removal of obturator material during endodontic retreatment in severely curved root canals, with Pro R Retreatment (MKlife), Easy ProDesign Logic RT (Easy Dental Equipment) and XP-Endo Finisher (FKG Dentaire). Occurrence of apical canal transportation, centring ability, volume of remaining obturator material was evaluated by comparing the images of the root canals obtained in the microtomograph before and after the clearance and the working time. The sample of this study consists of 38 curved mesial roots of manibular molars that were initially analyzed in the microtomograph, to enable the pairing of the groups: G1- ProDesign Logic RT; G2- ProDesign Logic RT + XP-Endo Finisher; G3 - Pro R Retreatment; G4- Pro R Retreatment + XP-Endo Finisher. The previous endodontic treatment was performed using the Protaper Next system (Dentsply Sirona) until the X2 file and the 25.06 cone filling (MKLife) and Endofill cements (Dentsply Sirona). The roots were stored at 37 ° C, 100% humidity air for 72 hours. Subsequently, retreatment was started following the manufacturer's instructions and without the aid of any type of solvent. The results showed no statistical difference between the groups regarding the volume of remaining obturator material (p> 0.05), but a better removal of the material in the cervical and middle thirds was observed. Regarding the centring ability there was no statistically significant difference (p> 0.05), but for transportation, there was a difference (p <0.05) in the G2 in relation to the other groups in the ML canal in the cervical third. The post-test t showed that there was a significant difference (p <0.05) between groups 1 and 2 (p = 0.0237), group 2 and 3 (p = 0.108) and group 2 and 4 (p = 0.0349). Regarding time, the Logic RT system was faster than Pro R. It follows that no system was able to completely remove the obturator material, XP-Endo Finisher does not enhance the removal of obturator material; the apical third is the most difficult area to remove the obturator material, all tested systems promoted apical canal transportation, Pro R retreatment and XP-Endo Finisher presented, in the cervical third of the ML canal, a higher transportation compared to Logic RT and ProDesign Logic RT had a shorter clinical working time compared to Pro R retreatment.