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Author Spotlight: Three-Dimensional Cephalometric Landmark Annotation Demonstration on Human Cone Beam Computed Tomography Scans
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Adding Depth to Cephalometric Analysis: Comparing Two- and Three-Dimensional Angular Cephalometric Measurements.

Diana S Jodeh1, Lauren V Kuykendall2, Jonathan M Ford3

  • 1Division of Plastic and Reconstructive Surgery, Johns Hopkins All Children's Hospital, St. Petersburg.

The Journal of Craniofacial Surgery
|July 14, 2019
PubMed
Summary
This summary is machine-generated.

Two-dimensional (2D) lateral cephalograms and 3D CT reconstructions yield comparable angular cephalometric measurements for craniofacial surgery. While minor differences exist, 2D and 3D data are largely interchangeable for most clinical applications.

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Area of Science:

  • Craniofacial surgery
  • Medical imaging
  • Orthodontics

Background:

  • Lateral cephalometric radiographs (LCR) are traditional for cephalometric analysis.
  • Three-dimensional (3D) imaging is transforming surgical planning.
  • Equivalence of 2D and 3D cephalometric measurements is not well-established.

Purpose of the Study:

  • To compare angular cephalometric measurements from 2D and 3D imaging modalities.
  • To determine if 2D and 3D cephalometric data are interchangeable in craniofacial analysis.

Main Methods:

  • Analyzed 62 head CT scans (36 female, 26 male).
  • Performed 12 angular cephalometric measurements on 3D reconstructions (Mimics 19.0).
  • Measured the same angles on 2D lateral cephalograms reconstructed from CT scans (Dolphin 11.9).
  • Used paired t-test for agreement and intra-class correlation for reliability.

Main Results:

  • Five of 12 angular measurements showed statistically significant differences (P < 0.05) between 2D and 3D analyses.
  • Significant differences included SNA, SNB, MP-FH, U1-SN, and U1-L1.
  • Observed differences were smaller than the standard deviations for each measure.

Conclusions:

  • Angular cephalometric values from 2D LCRs and 3D CT reconstructions show minimal differences.
  • Supports the interchangeable use of 2D and 3D cephalometric data in most clinical scenarios.
  • Clinicians should be judicious with specific measures, especially dental inclination using 2D LCRs.