Abstract
The purpose of this study is to evaluate, in vitro, the efficacy of Mtwo and ProTaper Universal Retreatment Systems for different materials removal from root canals. Forty single-rooted human teeth Will be prepared by using nickel-titanium Rotary files and allocated in 4 groups (n=10). The root canals will be filled with gutta-percha and AHPlus Jet® e MTA Fillapex®. After 30-day storage a…