ONE SINGLE INSTRUMENT FOR A SAFE ROOT CANAL PREPARATION | ONE SHAPE - Micro-Mega
Dental News Volume XX, Number I, March, 2013 by Dr. Jérome Elias, Dr. Jean-Jacques J-J Bonnin In endodontic treatments, Nickel-Titanium instruments in continuous rotation (1) optimize root canal shaping. Generally, rectilinear and barely curved root canals with a round or oval section does not cause difficulties and can be prepared by using all standard techniques. However, particularly thin and moderately or strongly curved canals with a laminar section are more difficult to shape and involve a considerable risk of failure. Despite its super elastic qualities, Nickel-Titanium alloy has one important inconvenience, namely its low resistance in case of repeated use which results in instrument separation. Instrument fracture can occur either through material fatigue caused by a significant number of compression-tension cycles or through torsion due to obstruction of the instrument’s tip in the canal (2) (4) . A certain number of factors such as the pressure exercised...