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Changes of lateral cephalometric values according to the rotation of head

Korean Journal of Orthodontics 2000³â 30±Ç 1È£ p.53 ~ 66
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±è±¤¼ö/Kwang Soo Kim ±è±¤¿ø/À±¿µÁÖ/Ȳ¹Ì¼±/ÃÖÀÇȯ/Mee Sun Hwang/Kwang Won Kim/Young Jooh Yoon/Eui Hwa Choi

Abstract

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-Abstract-
This study was performed to find out the effect projection errors on cephalometric
linear and angular measurements according to head rotation during taking lateral
cephalometric radiography.
Seventeen skulls with permanent dentition and on gross asymmetry were obtained
from the Department of Anatomy, Medical School, Chosun University. Total 527 x-ray
films were taken with 1¡Æinterval from the reference position(0¡Æ) to 15¡Æaround the
vertical axis (Z axis) which is perpendicular to the midpoint of the connecting the center
of two ear rods in submento-vertex direction.
Statistical analysis was performed by paired t-test if there were statistically
significant differences between the mean of the reference position(0¡Æ) and that of each
rotation angle.
The following results were obtained.
1. The projection errors of angular measurements were smaller than those of linear
measurements.
2. The projection errors of angular measurements including midline landmarks were
smaller than those including bilateral landmarks.
3. The horizontal linear measurements were gradually decreased when the skull was
rotated toward the film, but slightly increased and then decreased when the skull was
rotated toward the focal spot. However, the changes were smaller in focal direction.
4. The projection errors of horizontal linear measurements were larger than those of
vertical linear measurements.
5. The projection errors of vertical linear measurements were increased with increased
distance form the rotation axis to vertical measurements.
It is concluded that the use of angular measurements rather than linear measurements
is recommended to minimize the projection errors.

Å°¿öµå

Åõ»ç¿ÀÂ÷; µÎºÎȸÀü; Ãø¸ðµÎºÎ¹æ»ç¼±»çÁø; Projection error; Rotation of head; Lateral cephalometric radiographs;

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