An in-vitro comparative evaluation for detection of residual gutta-percha after root canal retreatment with four different files using stereo microscope
Keywords:
Rotary, RetreatmentAbstract
Background: Removal of gutta-percha using hand files with or without solvent is tedious and time consuming process especially when the root filling material is well compacted8. Therefore, the use of NiTi rotary instruments in the root canal retreatment might decrease patient and operator fatigue and various studies have reported their efficacy, cleaning ability and safety. Several NiTi rotary instruments also were been used to remove gutta-percha. Here in this study four file systems were used to assess the efficacy of each file system in retreatment procedures.Materials & methods: The study samples comprised of 80 extracted anteriors having single root canals with fully formed apices were collected. The crowns were de-coronated with a diamond disc to leave a 16-mm root. A size 10 K-file was introduced into the canal until it was visible at the apical foramen. The working length was determined by subtracting 1mm from this measurement. During shaping, each canal was irrigated with 3% sodium hypochlorite then smear layer was removed with 17% EDTA and 1 ml of 3% sodium hypochlorite. After one month the teeth were divided into following groups with 20 specimens each as follows.
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