Research to Improve Fixed Orthodontic Treatment of Angle Class II Severe Malocclusion with Premolar Extractions

The aim of the study was to evaluate the new orthodontic TiNb wires, in direct comparation to the golden standard in orthodontics, NiTi wires, when treating. There is limited information, in the literature, about patients with severe malocclusions being treated form start to end with TiNb, and the TiNb wires were mostly use iThe aim of the study was to evaluate the new orthodontic TiNb wires, in direct comparation to the golden standard in orthodontics, NiTi wires, when treating. There is limited information, in the literature, about patients with severe malocclusions being treated form start to end with TiNb, and the TiNb wires were mostly use in the final stages of treatment. Our pro-tocol consisted of three orthodontic wires 0.016, 0.016x0.025, 0.019x0.025 for levelling and aligning stage and 0.019x0.025 stainless steel for finishing stage, in order to treat the same case reproduced on a modified scientific simulator. The bracket system used was made by GC slot 0.22, TiNb wires made by Morita and the NiTi wires produced by GC. We ligated all bracket using SS wire ligatures 0.008, for anchorage we used transpalatal arch. The temperature of the scientific simulator was set between 20-25 degrees Cel-sius. We’ve used upper arches and we studied the repositioning of upper ectopic canines and space closure in order to obtain an equilibrated maxil-lary arch. After each changing of orthodontic wires we scanned the upper arch using Medit I600. After concluding all stages on all upper arches we assessed the results using LITTLE´s Iregularity index and stereo micros-copy to explain metal stress on NiTi and TiNb, we propose an optimized process of using TiNb and NiTi wires when treating class II severe maloc-clusions with premolar extractions. Thus, we observed permanent defor-mation for all 0,016 TiNb wires used in first stage, so TiNb underperformed in comparation with NiTi. Also, the Little´s Iregularity Index was superior in the NiTi wires group on 0.016 wires verifying the change of state in TiNb wires group.n the final stages of treatment. Our pro-tocol consisted of three orthodontic wires 0.016, 0.016x0.025, 0.019x0.025 for levelling and aligning stage and 0.019x0.025 stainless steel for finishing stage, in order to treat the same case reproduced on a modified scientific simulator. The bracket system used was made by GC slot 0.22, TiNb wires made by Morita and the NiTi wires produced by GC. We ligated all bracket using SS wire ligatures 0.008, for anchorage we used transpalatal arch. The temperature of the scientific simulator was set between 20-25 degrees Cel-sius. We’ve used upper arches and we studied the repositioning of upper ectopic canines and space closure in order to obtain an equilibrated maxil-lary arch. After each changing of orthodontic wires we scanned the upper arch using Medit I600. After concluding all stages on all upper arches we assessed the results using LITTLE´s Iregularity index and stereo micros-copy to explain metal stress on NiTi and TiNb, we propose an optimized process of using TiNb and NiTi wires when treating class II severe maloc-clusions with premolar extractions. Thus, we observed permanent defor-mation for all 0,016 TiNb wires used in first stage, so TiNb underperformed in comparation with NiTi. Also, the Little´s Iregularity Index was superior in the NiTi wires group on 0.016 wires verifying the change of state in TiNb wires group.