[Investigation on the effects of different brackets on the three-dimensional direction of the arch in the non reduction treatment].

PURPOSE: To compare the three-dimensional effect between traditional brackets and Damon self- ligating brackets on the arch during non-extraction treatment. METHODS: Forty-five patients with non-extraction treatment were included in this study. The patients were randomly divided into 3 groups. Patients in group A were treated with traditional brackets and Nickel titanium wire. Patients in group B were treated with Damon 3mx brackets and Cu-NiTi wire. Patients in group C were treated with traditional brackets and Cu-NiTi wire.Dentitions were aligned in each group according to the same order of arch wire and time. The widths of arch and cephalometric data, such as U1-SN, U1-PP, L1-MP, U6-PP (mm), L6-MP (mm) and other related datas, in T1 and T2 were measured and analyzed with SPSS 22.0 software package. RESULTS: Expansion and protrusion of the arch were observed, but there was no significant difference before and after treatment among 3 groups. CONCLUSIONS: There is no difference in the three-dimensional effect between Damon brackets and traditional brackets in non-extraction treatment of patients with mild crowding.