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Reference structures for assessment of frontal head posture

I Zepa¹, J Huggare

¹Department of Orthodontics, Karolinska Institutet, Huddinge, Sweden.

European Journal of Orthodontics

|February 2, 1999

Summary

The supra-orbital line closely matches the interpupillary line for head posture analysis. The orbital and cervical lines offer better reproducibility than cranial and spinal lines in cephalometric assessments.

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Area of Science:

Orthodontics and Dental Imaging
Biometrics and Anthropometry
Radiographic Analysis

Background:

Accurate cephalometric analysis requires reliable reference lines for assessing cranio-cervical posture.
The interpupillary line is a standard but can be challenging to identify consistently.
Investigating alternative reference lines is crucial for improving measurement reproducibility.

Purpose of the Study:

To evaluate the supra-orbital line as a valid substitute for the interpupillary line.
To assess the reproducibility of cranio-cervical vertical relationship measurements using different cephalometric reference lines.

Main Methods:

Frontal cephalograms of 21 Finnish and 11 Danish young adults were analyzed.
Measurements included orbital (ORB), cranial (CR), cervical (CER), spinal (SPINE), and interpupillary (IP) lines.
Intra- and inter-examiner reproducibility of measurements was calculated.

Main Results:

The supra-orbital line showed minimal deviation (0.5 degrees) from the interpupillary line.
Orbital (ORB) and cervical (CER) lines demonstrated superior intra- and inter-examiner reproducibility compared to cranial (CR) and spinal (SPINE) lines.
Intra-examiner reproducibility for ORB/HOR and CER/VER was 0.4 and 0.8 degrees, respectively.

Conclusions:

The supra-orbital line is a valid and reproducible alternative to the interpupillary line.
The cervical line, defined between atlas and C4, is also a reliable reference.
These lines are recommended for consistent frontal head posture assessment in cephalometric studies.

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