Torque Control

Torque Control Predefined torque values are based on new instruments! Used NiTi 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 NiTi 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/ ProTaper NiTi Yared G, Bou Dagher F, Kulkarni K. OOOOE 2003 To evaluate the influence of 2 electric torque control motors and operator experience with ProTaper NiTi 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 NiTi 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 NiTi 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 low- and high-torque endodontic motors. Gambarini G. J Endod. 2001 investigated the cyclic fatigue resistance high vs. low torque electric motors Profile NiTi: .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 low- and 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.