Effect of sterilization on the cutting efficiency of two different rotary NiTi instruments (An In- vitro Study)

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BACKGROUND: Dental rotary instruments can be applied under multiple canal conditions. This study assessed the performance of two batches of NiTi dental rotary files-Mani Jizai (Jz) and Dentsply ProTaper Next (PTN)-by evaluating their cutting efficiency. METHODS: A total of 80 files (40 from each type), with 8x digital microscope magnification used for defect inspection, were tested half of which before and the other half after sterilization. The sample size was tested in extracted upper molars' distobuccal (DB) roots to assess cutting efficiency by volumetric changes showing removed dentin volume. RESULTS: The Results indicated that the sterilized PTN files performed better at 5 mm, but no significant differences were noted at 10 mm between all file groups. At 15 mm, the performance of sterilized PTN files was inferior to that of non-sterilized Jz files. CONCLUSION: Sterilization and heat treatment affect file cutting efficiency by volumetric changes, especially at the coronal and apical one-thirds.

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