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Related Experiment Video

Updated: Jul 9, 2025

Author Spotlight: 3D Movement Assessment of Maxillary Posterior Teeth in Clear Aligner Treatment

Author Spotlight: 3D Movement Assessment of Maxillary Posterior Teeth in Clear Aligner Treatment

Published on: February 23, 2024

Efficient intraoral photogrammetry using self-identifying projective invariant marker.

Yanghai Chen¹, Mingzhu Zhu², Bingwei He¹

¹School of Mechanical Engineering and Automation, Fuzhou University, Fuzhou, 350108, Fujian, China.

International Journal of Computer Assisted Radiology and Surgery

|December 9, 2023

Summary

This summary is machine-generated.

This study introduces an efficient oral photogrammetry technique for re-measuring full-arch implant digital impressions. The projective invariant marker system achieves high accuracy with minimal measurement time, offering clinical value.

Keywords:

Fiducial marker Implant Photogrammetry Projective invariant

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Last Updated: Jul 9, 2025

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Published on: July 22, 2022

Area of Science:

Dental technology
Photogrammetry
Digital imaging

Background:

Accurate re-measurement of full-arch implant digital impressions is crucial for successful denture restoration.
Current methods may have limitations in efficiency and accuracy.

Purpose of the Study:

To present an efficient oral photogrammetry technology using a projective invariant marker.
To apply this technology for re-measuring full-arch implant digital impressions.

Main Methods:

Development of a self-recognizing marker with projection invariance and its detection code.
Installation of the marker on a scanning body for photogrammetric measurements.
Utilizing triangulation to determine 3D coordinates, followed by post-processing for enhanced accuracy.

Main Results:

Optimal working distance established between 200-250 mm.
Achieved a minimum measurement error below 0.05 mm and an average error of 0.10 mm.
Measurement completion time under 2 minutes.

Conclusions:

The photogrammetric system reliably determines full-arch implant positions efficiently.
The technology avoids intraoral scanning, enhancing patient comfort and safety.
Demonstrates significant potential for clinical application in dental restorations.