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Published on: February 23, 2024
OrthoCalc: The six degrees of freedom measurement workflow of rotational and displacement changes for maxilla
Yao Gao1, Yifei Gu2, Jeroen Van Dessel1
1The Department of Oral and Maxillofacial Surgery, University Hospitals Leuven, Belgium.
Background:
This study is undertaken to establish the accuracy and reliability of OrthoCalc, a 3D application designed for the evaluation of maxillary positioning.
Methods:
We registered target virtual planned models, maxillary models from pre-operative and post-operative CT scans, and post-operative intra-oral scans to a common reference system, allowing for digital evaluation. To assess rotational changes, we introduced a novel measurement method based on virtual cuboid models. Displacement errors were calculated based on proposed registration matrices. We also compared OrthoCalc to established commercial medical software as a benchmark.
Results:
Statistical significance calculated showed no significant differences between OrthoCalc and commercial software. the biggest error of 0.04 degree in rotation change was found in the yaw. A maximum displacement change of 0.75 mm was found in the X direction.
Conclusions:
Our study validates OrthoCalc as a precise and reliable tool for assessing maxillary position changes with six degrees of freedom in orthognathic surgery, endorsing its clinical utility.
