Methodological Approach to Accuracy Assessment in CAD-CAM Mandibular Reconstruction
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INTRODUCTION: Assessing accuracy in CAD-CAM mandibular reconstruction poses significant challenges but is essential for ensuring reliable outcomes. Existing methods are often operator-dependent, lacking repeatability and reproducibility. This study introduces the Global Positioning Layout (GPL) method, an accuracy assessment technique integrated into the reconstruction protocol based on CAD-CAM and additive printing technology. We describe the methodology and process for applying this approach in detail. MATERIALS AND METHODS: The GPL method was developed at the University of Padova, Italy. Key principles of accuracy assessment were identified and structured as Requirements, Data input, Data reference system, and Data output. The necessary 3D virtual models were defined: planned mandible, reference mandible, patient-specific implant (PSI), postoperative mandible, and postoperative PSI. A unique coordinate system (GPL-RS) was built on the reference mandible. Three Roto-Translational Matrices (RTMs) were applied to measure movements and deviations between the designed and postoperative models to assess reconstruction accuracy. RESULTS: A case study of mandibular reconstruction with a CAD-CAM titanium PSI is presented to showcase the GPL methodology. Geomagic Wrap ® software is used, utilizing its Python programming tools and GEO and API libraries. CONCLUSION: The GPL method represents a significant advancement in assessing the accuracy of CAD-CAM reconstructions, providing valuable insights that can improve surgical outcomes.