The Journal of Contemporary Dental Practice

Register      Login

SEARCH WITHIN CONTENT

FIND ARTICLE

Volume / Issue

Online First

Archive
Related articles

VOLUME 14 , ISSUE 2 ( March-April, 2013 ) > List of Articles

RESEARCH ARTICLE

Cephalometric Assessment of Effect of Head Rotation toward Focal Spot on Lateral Cephalometric Radiographs

V Naresh, Naveen Shamnur, NK Lokesh, KVV Pratapvarma, C Srikrishna, V Goutham Chakravarthy

Citation Information : Naresh V, Shamnur N, Lokesh N, Pratapvarma K, Srikrishna C, Chakravarthy VG. Cephalometric Assessment of Effect of Head Rotation toward Focal Spot on Lateral Cephalometric Radiographs. J Contemp Dent Pract 2013; 14 (2):202-207.

DOI: 10.5005/jp-journals-10024-1300

Published Online: 01-04-2013

Copyright Statement:  Copyright © 2013; Jaypee Brothers Medical Publishers (P) Ltd.


Abstract

Introduction

The patient's head can be slightly rotated sagittally vertically or transversely with the head holding device. Because of such improper positions due to head rotation, an error can occur in cephalometric measurements. The purpose of this study was to identify the projection errors of lateral cephalometric radiograph due to head rotation in the vertical Z-axis toward the focal spot.

Materials and methods

Ten human dry skulls with permanent dentition were collected. Each dry skull was rotated from 0° to +20° at 5° intervals. A vertical axis, the Z-axis, was used as a rotational axis to have 50 lateral cephalometric radiographs exposed. Four linear (S-N, Go-Me, N-Me, S-Go) and six angular measurements (SNA, SNB, N-S-Ar, S-Ar-Go, Ar-Go-Me, ABmandibular plane angle) were calculated manually.

Results

The findings were that: (1) Angular measurements have fewer projection errors than linear measurements. (2) The greater the number of landmarks on the midsagittal plane that are included in angular measurements, the fewer the projection errors occurring. (3) Horizontal linear measurements have more projection errors than vertical linear measurements.

Conclusion

The angular measurements of lateral cephalometric radiographs are more useful than linear measurements in minimizing the projection errors associated with head rotation on a vertical axis toward the focal spot.

How to cite this article

Naresh V, Lokesh NK, Pratapvarma KVV, Srikrishna C, Chakravarthy VG, Shamnur N. Cephalometric Assessment of Effect of Head Rotation toward Focal Spot on Lateral Cephalometric Radiographs. J Contemp Dent Pract 2013;14(2):202-207.


PDF Share
  1. The effect of image quality on the identification of cephalometric landmarks. Am J Orthod 1978;48(1):49-56.
  2. Effect of head rotation on lateral cephalometric radiography. Angle Orthod 2001;71:396-403.
  3. The cephalometric projection II: Principles of image distortion in cephalography. Dentomaxillofac Radiol 1983;12:101-08.
  4. The reliability of head film measurements 2 conventional angular and linear measurements. Am J Orthod 1971;60(5):505-17.
  5. The reliability of head film measurements 1. Landmark identification. Am J Orthod 1971;60(2):111-27.
  6. Effect of projection errors in cephalometric length measurements. Eur J Orthod 1986;10:353-61.
PDF Share

© Jaypee Brothers Medical Publishers (P) LTD.