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Updated: Jul 8, 2026
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A Postoperative Evaluation Guideline for Computer-Assisted Reconstruction of the Mandible
Published on: January 28, 2020
Virtual articulation using sequential mandibular intraoral scans and computational functional rotation reference
Mohamed Sherif Omar1, Chao-Chieh Yang1, Dean Morton1
1Department of Prosthodontics, Indiana University School of Dentistry, Indianapolis, Indiana, USA.
Summary
This study introduces a new computational method for orienting digital dental casts using intraoral scans and leaf gauges. This technique enables precise patient-specific virtual articulation without needing extra hardware.
Area of Science:
- Biomedical Engineering
- Dental Technology
- Computational Anatomy
Background:
- Accurate spatial orientation of digital casts is crucial for virtual articulators in prosthesis design.
- Current orientation methods rely on external hardware or population-based data, limiting patient-specific accuracy.
Purpose of the Study:
- To present a novel computational method for determining a functional rotation reference from intraoral scans.
- To enable patient-specific virtual articulation using only standard intraoral scanning equipment and leaf gauges.
Main Methods:
- Sequential mandibular intraoral scans were captured at controlled opening increments using leaf gauges.
- An algorithm identified regions of minimal translation to establish a functional rotation reference.
- This reference was transformed to align with virtual articulator intercondylar axis coordinates.
Main Results:
- The computational method successfully determined a functional rotation reference for virtual articulators.
- Forward validation showed an average root mean square deviation of 0.14 mm.
- The technique was implemented across multiple virtual articulator systems (Denar Mark 330, Artex CR, Stratos 300).
Conclusions:
- This proof-of-concept technique provides a patient-specific method for virtual articulation.
- It eliminates the need for supplementary registration hardware, relying solely on intraoral scans and leaf gauges.
- The method enhances the accuracy and accessibility of digital dental cast orientation.
