Torque Control Torque Control Predefined torque values are

Torque Control

Torque Control • Predefined torque values are based on new instruments! • Used Ni. Ti files have 50 -60% decreased resistance to fracture after use with high-torque motors. Gamborini 2001 • Predefined torque values on some motors are > than the fracture limit of the Ni. Ti file. Gamborini 2001 • Handpieces have different degrees of effectiveness, which affects torque values on files. Gamborini 2001

Influence of torque control motors and the operator's proficiency w/ Pro. Taper Ni. Ti Yared G, Bou Dagher F, Kulkarni K. OOOOE 2003 • To evaluate the influence of 2 electric torque control motors and operator experience with Pro. Taper Ni. Ti on the incidence of deformation and separation of instruments. • Preclinical training in the use of the PT technique at 300 rpm is crucial to prevent instrument separation and deformation. • High torque control motor is safe with the experienced operator.

Advantages and disadvantages of new torque-controlled endodontic motors and low-torque Ni. Ti rotary instrumentation. Gambarini G. Aust Endod J. 2001 Advantages: • reduced pressure/force required • computer-controlled electronics • allows for fine adjustment of torque values • improved tactile awareness • new ‘mental’ awareness • > resistance to cyclic fatigue • reduces rate of fracture rotary files

Advantages and disadvantages of new torque-controlled endodontic motors and low-torque Ni. Ti rotary instrumentation. Gambarini G. Aust Endod J. 2001 Disdvantages: • < cutting efficiency • slower instrument advancement • increases time of debridement procedure

Cyclic fatigue of nickel-titanium rotary instruments after clinical use with lowand high-torque endodontic motors. Gambarini G. J Endod. 2001 • investigated the cyclic fatigue resistance • high vs. low torque electric motors • Profile Ni. Ti: . 06/25, . 06/20, and. 04/25 • A = 10 new instruments (control) • B = 20 used instruments, high-torque motor • C = 20 used instruments, low-torque motor

Cyclic fatigue of nickel-titanium rotary instruments after clinical use with lowand high-torque endodontic motors. Gambarini G. J Endod. 2001 • group A (new) instruments exhibited significantly higher values of rotation-to-breakage cycles • Statistically higher resistance to cyclic fatigue was noted for group C (low-torque) in all sizes compared with group B • the use of endodontic motor with lower torque values reduced cyclic fatigue of nickel-titanium rotary instruments.