Resistencia friccional en combinaciones de alambres de níquel titanio súper elásticos con brackets autoligables pasivos en movimientos de primer orden. Estudio in vitro

Abstract

Introduction: it is important for the orthodontist to know the frictional resistance generated between the wires and the brackets in all phases of the active orthodontic, it will allow him to establish a treatment plan according to the needs of the malocclusion. The purpose of this research was to compare the frictional resistance in nickel titanium superelastic wires of caliber 0.016 "and rectangular 0.016x0.022" (3M) using passive self-ligating brackets Smartclip® and Carriere® MBT slot 0.022x0.028" in movements of first order. Materials and methods: Materials and methods: 0.016 "and 0.016x0.022" (3M) Nickel Titanium wires were used in combination with passive self-ligating brackets Smartclip® and Carriere® MBT slot 0.022x0.028 ", which were cemented to fully aligned in models Which allowed movement of one of the brackets, the wire was incorporated and the models were mounted on a certified Instron® universal testing machine, simulating first-order movements taking log at four different points of displacement that started from 0,0 to 3,0 millimeters and returned to the site of origin (0,0mm), each combination was tested 10 times, under the same conditions. Results: the behavior of the load and discharge curve was similar, however; all combinations generated statistically significant differences (p ≤ 0.01) in the strength and stiffness values. The frictional resistance increased as the wire gauge increased and for some combinations during discharge, despite comparing between the same wire group and brackets, there were statistically significant differences. Conclusion: The greatest frictional resistance in lingual discharge occurred in the combination of Nickel Titanium 0.016 "and 0.016x0.022" wires with Smartclip® brackets and in vestibular discharge with Carriere® brackets.