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Automated Global Positioning Layout (GPL) for accuracy assessment in CAD-CAM mandibular reconstruction - method introduction.

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Related Experiment Video

Updated: May 3, 2026

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Automated Global Positioning Layout (GPL) for accuracy assessment in CAD-CAM mandibular reconstruction - Method

Elisa Vargiu1, Laura Tognin2, Giordana Bettini3

  • 1Department of Management and Engineering, University of Padua, Padua, Italy. elisa.vargiu@phd.unipd.it.

Scientific Reports
|February 24, 2026
PubMed
Summary

A new Global Positioning Layout (GPL) protocol offers a standardized, reproducible method for assessing accuracy in computer-assisted mandibular reconstruction, overcoming limitations of existing techniques.

Keywords:
Accuracy assessment, ValidationComputer-Aided Manufacturing,Mandibular reconstruction, Computer-Aided Design,Prosthesis,

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Area of Science:

  • Oral and Maxillofacial Surgery
  • Medical Imaging
  • Surgical Planning

Background:

  • Standardized accuracy assessment is lacking in computer-assisted mandibular reconstruction.
  • Current methods like landmark-based and surface-based comparisons have significant limitations, including operator variability and inability to detect local deviations.

Purpose of the Study:

  • To validate a novel, automated protocol, the Global Positioning Layout (GPL), for quantifying 3D discrepancies in mandibular reconstruction.
  • To compare the performance and reliability of GPL against existing Methods A (landmark-based) and B (surface-based).

Main Methods:

  • Retrospective analysis of 17 patients undergoing mandibular reconstruction.
  • Three operators performed measurements twice using GPL, Method A, and Method B.
  • Performance metrics included reproducibility, operator variability, and spatial orientation of deviations.

Main Results:

  • The Global Positioning Layout (GPL) method demonstrated complete reproducibility with no inter- or intra-operator variability.
  • Landmark-based methods showed poor reproducibility, systematic bias, and frequent inapplicability.
  • Surface-based methods were operator-dependent for alignment and masked localized deviations.

Conclusions:

  • The Global Positioning Layout (GPL) is a robust, fully reproducible tool that overcomes critical limitations of current mandibular reconstruction accuracy assessment techniques.
  • GPL provides a foundation for a standardized protocol to improve surgical outcome comparison, technique refinement, and patient results.