Dental Press Journal of Orthodontics (Oct 2023)

A new way of analyzing tooth movement using universal coordinate system geometry single point superposition in a 3D model

  • Rodrigo Xavier Silveira de SOUZA,
  • Gustavo Almeida Silveira de SOUZA,
  • João Pacheco COLARES,
  • Tânia Mara de Souza IANNI,
  • Cláudia Silami de MAGALHÃES,
  • José Alejandro GUERRERO-VARGAS,
  • Carina Cristina MONTALVANY-ANTONUCCI,
  • Soraia MACARI

DOI
https://doi.org/10.1590/2177-6709.28.4.e232333.oar
Journal volume & issue
Vol. 28, no. 4

Abstract

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ABSTRACT Introduction: Superposing 3D models is an imminent need. However, current methods rely on marking multiple points on the maxilla and mandible, which could increase point marking and overlapping errors. Objective: This study aimed at developing a method for superimposing 3D models of the maxillary and mandibular arches with Autodesk Inventor® engineering software, using a single universal coordinate system (UCS) point superposition. Methods: A total of 104 STL (stereolithography) models of the maxillary and mandibular arches exported from My iTero® platform were retrospectively selected, in which T0 and T1 were the initial and refinement periods, respectively (n=26 per group). The X, Y, and Z coordinates associated with a single point in each arch were inserted into the models with SlicerCMF® software for model orientation. The arch models with UCS registration were transferred to Autodesk Inventor® for superimposition and to measure tooth movements performed during Invisalign® treatment. Arch expansion, intrusion and rotation were analyzed by two examiners. The statistics were performed using intraclass correlation coefficients (ICC), Dahlberg’s formula, and t-test (p0.90). A systematic error was not found concerning linear and angular measurements (<1mm and <1.5°, respectively). Digital dental movements could be analyzed, including arch expansion, dental intrusion, and tooth rotation. Conclusions: The developed method was proven reliable and reproducible for superimposing 3D models of the maxillary and mandibular arches by using UCS system.

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