Ligatureless Low Friction Self-Ligating Bracket: A Finite Element Study

This study used the finite element method to evaluate a new orthodontic bracket design aiming to reduce friction during tooth movement, thereby minimizing tissue damage. The analysis focused on sliding resistance, retention capacity, and activation using stainless steel brackets (slot: 0.022"x0.027") and various archwire types: square (0.022"x0.022"), rectangular (0.021"x0.025"), and round (0.020"). Simulations were performed under dry (µ=0.5) and lubricated (µ=0.3) conditions, totaling 40 models. Loads were applied to the arches, and von Mises stresses and forces were computed. The passive self-ligating sliding contact bracket showed up to 15% lower resistance to mesiodistal sliding under constant movement and up to 80% under variable movement with a 1N load; under 10N, the reduction reached 80% in both conditions. The active variant demonstrated full engagement of all wire edges and lower resistance to sliding. The distribution of stress varied with arch type and load direction, with round wires showing higher peak stresses. These results indicate promising mechanical advantages of the new bracket design in reducing sliding resistance while enhancing wire control. However, since this is a numerical simulation, clinical studies are required to confirm these findings and determine their practical relevance in orthodontic treatment.