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Three-Dimensional Cephalometric Landmark Annotation Demonstration on Human Cone Beam Computed Tomography Scans

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Cone-beam computed tomography transverse analysis. Part I: Normative data.

R Matthew Miner¹, Salem Al Qabandi, Paul H Rigali

¹Department of Orthodontics, Boston University Goldman School of Dental Medicine, MA, USA.

American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics

|August 28, 2012

Summary

Cone-beam computed tomography (CBCT) reveals hidden skeletal discrepancies in patients without crossbite. This 3D analysis aids orthodontists in identifying and treating transverse dimension issues for better treatment decisions.

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Area of Science:

Orthodontics
3D Imaging
Craniofacial Anatomy

Background:

Cone-beam computed tomography (CBCT) has revolutionized 3D analysis in orthodontics, enhancing understanding of craniofacial skeletal anatomy.
Studies are increasingly leveraging CBCT to realize its potential in clinical applications.
Transverse dimension analysis is crucial for comprehensive orthodontic assessment.

Purpose of the Study:

To investigate transverse dimension relationships using CBCT.
To propose a novel transverse analysis method for orthodontic treatment planning.
To identify skeletal and dental discrepancies in patients with and without crossbite.

Main Methods:

Analyzed CBCT scans of 241 patients (with and without crossbite).
Assessed jaw width and first molar inclination.
Compared dental and skeletal measurements between non-crossbite and crossbite groups.

Main Results:

Non-crossbite patients exhibited masked skeletal transverse discrepancies due to dental compensation.
Unilateral crossbite patients showed dental compensation on the non-crossbite side.
Bilateral crossbite patients had normal dental inclinations but narrower maxillas and wider mandibles.

Conclusions:

Both unilateral and bilateral crossbite groups presented with narrower maxillary widths and wider mandibles compared to controls.
Dental compensations were noted in non-crossbite groups, indicating potential underlying skeletal issues.
Significant skeletal discrepancies may exist even in patients without apparent crossbite, warranting careful evaluation.