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Digital model superimpositions: are different software algorithms equally accurate in quantifying linear tooth

Samar M Adel1, Nikhilesh R Vaid2, Nadia El-Harouni3

  • 1Department of Orthodontics, Faculty of Dentistry, Alexandria University, Champollion Street, El Azarita, Alexandria, Egypt. orthosamar@gmail.com.

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Summary

Compare and Geomagic software accurately measure linear tooth movement in clear aligner therapy. Compare software demonstrated the highest consistency for both maxillary and mandibular movements, offering reliable digital simulation analysis.

Keywords:
3D digital models3D tooth movementAligner therapyDigital SetupDigital orthodonticsRegistrationScanning

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Area of Science:

  • Orthodontics
  • Dental Digital Technology
  • Biomedical Engineering

Background:

  • Assessing the precision of 3D digital model registration software is crucial for accurate linear tooth movement measurements in orthodontics.
  • Clear aligner therapy relies on precise digital setups for treatment planning and outcome prediction.

Purpose of the Study:

  • To evaluate and compare the accuracy of three distinct 3D digital model registration software packages (Geomagic, OrthoAnalyzer, Compare) for linear tooth movement analysis.
  • To determine the reliability of these software packages against a 3D digital virtual setup (DS) reference standard.

Main Methods:

  • Twenty pre-treatment dental scans from clear aligner therapy patients were utilized.
  • Digital Setups (DS) were created, and pre-treatment scans (T1) and DS (T2) were converted to STL files for import into Geomagic, OrthoAnalyzer, and Compare software.
  • Linear tooth movements were calculated and compared between software outputs and the DS reference.

Main Results:

  • Compare and Geomagic software demonstrated high accuracy (agreements >0.90) for maxillary linear tooth movements.
  • Compare software exhibited the highest consistency for both maxillary and mandibular measurements (agreements >0.90).
  • OrthoAnalyzer showed moderate agreement (0.50–<0.75) for both arches, while Geomagic showed good agreement for mandibular movements (0.75–0.90).

Conclusions:

  • Compare and Geomagic software packages are highly accurate for measuring maxillary tooth movement, with Compare software being the most consistent across both arches.
  • All tested software packages showed acceptable agreement with the digital setup, indicating their utility in orthodontic digital workflows.
  • Buccolingual tooth movements demonstrated the highest agreement among linear measurements, suggesting superior accuracy for this specific movement type.