Comparison of ultrasound Fiberglass Pin Removal using or not using Operating Microscope

Endodontics seeks to sustain teeth whose pulps, for some reason, have lost the quality of maintaining vitality or have become necrotic. Careful attention should be paid to cases of root canal infection as the solution for these cases is very difficult. The aim of this study was to compare the removal of fiberglass pins with ultrasound inserts using or not an operating microscope. Twenty human mandibular premolars were selected, instrumented with the Logic 25/06 system and irrigated with 2.5% sodium hypochlorite (NaOCl). The canals were dried, filled and the specimens stored in distilled water (maintained at 36.5°C and 100% humidity). Unobturation was performed until 5 mm of filling material remained in the apical region. The glass fiber retainers, previously selected, were cemented with an ED Primer adhesive system and Panavia F resin cement, then the samples were stored for 24 hours at 37°C. Subsequently, the dental elements were divided into two groups for the removal of intraradicular retainers with 25 IRRI S ultrasound insert: G1 - removal of fiberglass posts with ultrasound insert without microscope and G2 - removal of fiberglass posts with ultrasound insert without microscope. Subsequently, all teeth were subjected to longitudinal section in the mesiodistal direction with a 22 mm double-faced diamond disk, coupled to a straight piece and a micromotor cooled with air/water spray. After this procedure, an operating microscope at 12.5X magnification was used to verify the rest of the fiberglass post in the cervical, middle and apical thirds. G2 showed better results than G1 in removing the fiberglass post in the three root thirds. It is possible to conclude that the removal of the intraradicular retainers with ultrasound and microscope offer better results.