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Our study was conducted to evaluated efficiency of edge XR file systems in comparison to MTwo retreatment file system in retreatment using two solvent chloroform and eucalyptol.
Retrievability, with different solvents, was evaluated by measuring the percentage of remaining obturation material and the time required for retreatment process.
The total number of sample wasforty mandibular first molar. The specimens were divided into two groups according to method of retreatment group I using edge file and group II using MTwo file. Each group was further divided into two subgroup: sub groupA using chloroform solvent and subgroup B using eucalyptol solvent.
Teeth were decoronated, instrumented using revo s system up to SU file (25/06) and then obturated with guttapercha and adseal using continuous wave obturation .After obturation specimens were sealed with composite and stored in 100% humidity &37⸰c to allow sealer to set.
After retreatment teeth were splittedlongitudinally and imaged using stereomicroscope then analyzed by IMAGE J software tomeasure percentage of remaining root filling material in coronal, middle and apical third of root canal
The time required for retreatment was measured from the first retreatment file used until no obturation material can be distinguished on the last file.
MTwo retreatment file system left more remaining root filling material than edge xr system with significant difference
Remnants of root filling material were left in apical third more than middle and coronal third, but without significant difference.
There was no significant difference between chloroform and eucalyptol solvent.
Under the circumstances of this study, it can be concluded that:
1. Edge XR file has higher efficiency in removal of root canal filling material than MTwo file
2.Chloroform and eucalyptol have the same dissolving effect on root canal filling material.
3. Different root section doesn’t affect amount of remaining root filling material.
1. Studies evaluating fracture incidence and cyclic fatigue of retreatment rotary systems will be required.
2. Studies evaluating effect of retreatment rotary file system on straightening of curved root canal during retreatment will be required.
3. Studies evaluating apical extrusion of debris during retreatment will be required.