Abstract
The aim of the study is to evaluate the resistance to fatigue fracture of nickel-titanium instruments submitted to dynamic bending test, comparing the reciprocal systems WaveOne and Reciproc, as well as the influence of variation in penetration/traction on the two types of instruments. Will be evaluated twenty instruments of the systems Reciproc (VDW) and Wave One (Dentsply-Maillefer), wh…