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Author Spotlight: 3D Movement Assessment of Maxillary Posterior Teeth in Clear Aligner Treatment
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Natural reference structures for three-dimensional maxillary regional superimposition in growing patients.
Yi Fan1,2, Bing Han3,2, Yungeng Zhang4
1Third Clinical Division, Peking University School and Hospital of Stomatology, Beijing, China.
BMC Oral Health
|September 8, 2023
Summary
This study identified stable natural reference structures (NRS) in the 3D maxilla for orthodontic assessment. These NRS provide results comparable to traditional 2D methods, improving 3D superimposition accuracy.
Area of Science:
- Orthodontics
- Craniofacial imaging
- Biomechanical analysis
Background:
- Assessing maxillary changes requires reliable superimposition methods, which are established for 2D but not 3D imaging.
- Current 3D methods lack standardized natural reference structures for the maxilla.
Purpose of the Study:
- To identify natural reference structures (NRS) in the 3D maxilla of growing patients.
- To evaluate the applicability of these NRS for 3D maxillary superimposition.
- To compare the concordance of 3D NRS superimposition with Björk's 2D method.
Main Methods:
- Utilized cone-beam computed tomography (CBCT) scans and orthodontic mini-screws as initial references.
- Employed rigid and non-rigid registration to analyze maxillary voxel displacement.
- Identified stable regions based on minimal displacement relative to mini-screws.
Main Results:
- Mini-screws were confirmed as stable reference points in CBCT scans.
- Identified stable NRS include infraorbital rims, piriform foramen area, infrazygomatic crest, and hard palate.
- 3D NRS superimposition showed no significant difference in tooth movement compared to Björk's 2D method.
Conclusions:
- Established stable 3D natural reference structures for maxillary superimposition.
- The proposed NRS method offers a reliable alternative for 3D analysis.
- Results are comparable to traditional 2D methods, enhancing diagnostic capabilities.
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