[Experimental study of the efficacy of endodontic instruments in pure traction]

A method to test the efficiency of traction is developed on bovine bones, according to a mechanical mode. This procedure concern specific dynamics of the M.M.E. as well as the traction components of M.M.C. Profilometric measurement of the volume of material removed with each instrument for a specific number of turns, reflects its cutting efficiency in traction. Lubrification always increases the instruments' cutting power, whether it is provided by water or sodium hypochlorite solution. Loss of the efficiency of an M.M.E. instrument, used clinically, has been estimated at approximately 50%.