 Corresponding author: Andrea Carolina Ulloa Gómez Copyright © 2023 Author(s) retain the copyright of this article. This article is published under the terms of the Creative Commons Attribution Liscense 4.0. Comparison of cross-sectional orthodontic analysis on digital models using Nemocast and CBCT software Andrea Carolina Ulloa Gómez * , Wendy Paola Parra Hidalgo, Eliana Elizabeth González Rodas and Manuel Estuardo Bravo Calderón Faculty of Dentistry, University of Cuenca, Av. 12 de Abril s;n, Cuenca, Ecuador. World Journal of Advanced Research and Reviews, 2023, 17(01), 1286–1296 Publication history: Received on 13 December 2022; revised on 22 January 2023; accepted on 25 January 2023 Article DOI: https://doi.org/10.30574/wjarr.2023.17.1.0142 Abstract Model measurements and analysis are essential for the diagnosis of orthodontic cases and in the last decade orthodontic diagnosis has increased with technological advances, leaving aside traditional diagnostic methods, such as model analysis, especially when it comes to cross-sectional analysis. The present study seeks to propose to the clinician a simple option in the diagnosis of the transversal problem, through analysis with the CBCT. To support this proposal, data was collected from 40 students who were evaluated according to the parameters established in the study, between the ages of 21 and 27. Data were taken from digital study models in STL format, as well as CBCT. The UPenn analysis was used in the CBCT and applying the Korkhaus and Wala Ridge analyzes for the STL digital models, establishing comparisons of the validity of the results by calculating the predictive values of the positive test and the negative test. Model analysis was performed by measuring, using the NemoCast3D software. The comparison of means of both measures was carried out, which showed that there is no significant difference and then the correlation of measures was made, which proved to be significant in 5 of 7 measures. This model analysis proposal (AN-BAR) can be useful for the clinician in making a decision when performing a maxillary expansion. Keywords: Digital models; Cone beam computed tomography; Transverse discrepancy; Korkhaus analysis; Wala Ridge analysis; Penn analysis 1. Introduction The diagnosis in orthodontics should be made in a global way, both in dental structures and bone structures, with a correct diagnosis can be made proper planning and implementation of orthodontic treatments that will be preventive, interceptive and corrective. These diagnostic records provide information about the conditions of the patient at the time of starting treatment. Among these are the study models, which provide information about the shape of the arches, their symmetry, the amount of crowding, number and size of the teeth, presence or absence of diastemas and rotations. It is also possible to take measurements to determine the amount of space required for all teeth to be aligned correctly [1]. The objectives of the orthodontic specialist are clearly established, its purpose is to achieve a functional, harmonious and stable occlusal relationship, by correcting the problems in the three directions of space, all this starts from a correct diagnosis; for this purpose, and several methods are available to diagnose the relationships between the jaws in the vertical, transverse and sagittal dimensions [2]. Nowadays the most widely used method for transverse diagnosis is the tomographic analysis (CBCT) proposed by the University of Pennsylvania-2010 (UPenn Analysis) because with the advent of 3D, accurate measurements can be obtained without major distortion of structures, with greater ease in the localization of anatomical points. This