# Surface integrity assessment of endodontic instruments after repeated use: A microscopic analysis

## TL;DR

This study examines how repeated use affects the surface condition of endodontic instruments using microscopic analysis.

## Contribution

The study provides new empirical data on surface wear of Ni-Ti rotary files after repeated use.

## Key findings

- SEM analysis showed significant surface deterioration after ten uses, with pitting increasing dramatically (p < 0.001).
- Twisted File had the least surface damage, followed by ProTaper Next and V Taper 2H, while Mtwo showed the most wear.
- Surface wear assessment helps reduce clinical instrument failures.

## Abstract

The surface condition of four Ni-Ti rotary file systems after using them to shape premolar root canals ten times are of interest.
Laboratory tests through SEM showed substantial surface deterioration because pitting dramatically increased after ten procedures
(p < 0.001). The Twisted File system remained in the best condition with the minimum amount of surface damage and second place went
to ProTaper Next and V Taper 2H ranked after them and Mtwo showed the maximum wear. The surface wear observed in Mtwo exceeded that of
all the other tested Ni-Ti rotary file systems. The assessment of file surfaces aids in minimizing clinical failures of instruments.