Introduction: Anterior open bite is commonly related with increased vertical dimension. Some early treatment protocols consider the association of appliances that eliminate the deleterious habits with others that produce vertical control of posterior teeth. Superimposition of digital models has been used to assess the three-dimensional effects of orthodontic treatment in some malocclusions. Nevertheless, the use of this method in anterior open bite treatment evaluation has not been reported. Objective: The aim of this study is to compare the three-dimensional changes in anterior open bite patients treated with bonded spurs associated or not with posterior build-ups. Material and Methods: Fifty patients between 7 and 11 years old with anterior open bite were prospectively and randomly allocated to one of the two treatment groups. The Experimental Group comprised 25 patients treated with lingual bonded spurs associated with posterior build-ups, and the Control Group comprised 25 patients treated only with lingual bonded spurs. Digital models, acquired by intraoral scanning, were obtained at the beginning (T1) and after 12 months of treatment (T2). Superimpositions of T1 and T2 digital dental models will be performed in 3D SlicerCMF software, based on points and regions of interest. Three-dimensional linear distances and the amount of directional changes in each plane of 3D space (x, y, and z: mediolateral, anteroposterior and superoinferior axes, respectively) will be measured. Intraclass correlation coefficients (ICC) and Bland Altman tests will be used to assess reproducibility. After verifying sample´s normal distribution, intergroup comparisons will be performed with t test (P<0.05).
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