Fabio Gorni
Endodontic diagnosis, therapies and follow-up procedures can be the most complex of dental treatments; among these, shaping the root canals has always been considered as the basic and most important procedure. Various instruments and techniques have been developed in the history of endodontics, to deal with the almost infinite anatomical variations of root canals; this topic has been extensively debated elsewhere in this web site (http://www.styleitaliano.org/history-of-endodontic-instruments). A relatively recent technological evolution has put forth a variety of endodontic files, more aggressively shaped, flexible but resistant to breakage, made from new alloys, with new surface treatments, mechanically driven with rotary or reciprocating motion. These instruments should be chosen and used according to the manufacturer’s instructions, in a precise sequence or sometimes as a single file, after evaluation of canal anatomy, curvature and gauge. This evaluation is either made with an initial scouting of the canal with small instruments, or even directly examining a periapical x-ray. Obviously, each commercial brand of endodontic instruments proposes a different protocol, based upon the use of instruments of its own production. The possibility to choose instruments of different brands for different canals, or the use of simplified sequences, is ruled out ......