Evaluation of SARDAC Technique During En-Masse Retraction in Lingual Orthodontics

To evaluate the predictability of (SARDAC) technique regarding torque control and vertical movement during en -masse retraction in lingual orthodontics. Different setups of the SARDAC technique were tested during en-masse retraction in lingual orthodontics. Simu-lated retraction was performed using the Orthodontic Measurement and Simulation System (OMSS). Lever arms were welded between the lateral incisor and canine brackets bilaterally on a 0.017"X0.025" inch maxillary lin-gual stainless-steel wire. Bilateral, nickel titanium coil springs were used to apply a retraction force of 1.5 N per side on para-median mini-screws, inter radicular mini-screws and to the first molar brackets. Regarding the torque, the group where the force was applied between the 15 mm lever-arm and the first molar bracket, was the only group that showed statistically significant difference (palatal root torque) during en-masse retraction compared to the control group. Regarding the vertical movement, no statistically significant difference was found between any mechanical setup and the control group. SARDAC technique is predictable and efficient in controlling torque and vertical movement during en-masse retraction in lingual orthodontics.