Avaliação da quantidade de movimentação dentária com fios de níquel-titânio e aço multifilamentado na fase inicial de tratamento ortodôntico com aparelho fixo

Abstract

This longitudinal retrospective randomized clinical trial aimed to compare the clinical effectiveness of two different orthodontic alloy wires (.016” nickel-titanium and .0155“ multistranded coaxial) used for dental alignment and leveling during 6 weeks. The amount of tridimensional movement was also evaluated. Digital technology has been widely used in three-dimensional dental casts. Therefore, there are a short number of clinical trials. Methods: The sample was composed by two groups of 12 young patients’ casts of both upper and lower jaws. The casts were digitalized, with Maestro 3D scanner, in two different times of treatment: T1 was before the wire was placed and T2 was 8 weeks after its placement, in a total of 96 jaw digitalized images. Geometric Qualify Software was used to generate the superimposition of upper and lower jaws. Using the palatal ruggaes as a fixed point for superimposition of the upper jaw, a method using it and the models in occlusion was created to transfer a fixed point to the lower jaws, allowing its superimposition as well. The precise quantity of movement generated by each type of wire was measured and visualized through CMF Application software by using isolines and color maps tools. Results: The .016" nickeltitanium wire promoted greater amount of tooth movement, which was statistically significant, using Mann-Whitney U test (p < 0.05). Conclusion: The nickel-titanium wires promoted a higher quantity of tooth movement than the multistranded stainless steel wire.