Document Detail


Cephalometric Assessment of Effect of Head Rotation toward Focal Spot on Lateral Cephalometric Radiographs.
MedLine Citation:
PMID:  23811646     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
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. Keywords: Projection error, Head rotation, Lateral cephalometric radiograph. 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. Source of support: Nil Conflict of interest: None declared.
Authors:
V Naresh; Nk Lokesh; Kvv Pratapvarma; C Srikrishna; V Goutham Chakravarthy; Naveen Shamnur
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Publication Detail:
Type:  Journal Article     Date:  2013-03-01
Journal Detail:
Title:  The journal of contemporary dental practice     Volume:  14     ISSN:  1526-3711     ISO Abbreviation:  J Contemp Dent Pract     Publication Date:  2013  
Date Detail:
Created Date:  2013-07-01     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101090552     Medline TA:  J Contemp Dent Pract     Country:  India    
Other Details:
Languages:  eng     Pagination:  202-7     Citation Subset:  D; IM    
Affiliation:
Professor, Department of Orthodontics, Purvanchal Institute of Dental Sciences, Gorakhpur, Uttar Pradesh, India.
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