<abstract xmlns="http://www.w3.org/1999/xhtml">

<sec>
<h3>Objective</h3>
<p>To evaluate the reliability of the magnification method for localisation of palatally placed canines.</p>
</sec>
<sec>
<h3>Methods</h3>
<p>Panoramic radiographs were taken of subjects, aged 10 to 12 years, with unerupted upper permanent canines. Two periapical radiographs (horizontal parallax method) were then used to identify 36 subjects with one palatally placed canine. Differences in the sizes of crowns of the canines on the panoramic radiographs were used to identify which tooth was palatally placed. The observer was blinded to the side with the palatally placed canine. The parallax and magnification results were tabulated, and the sensitivity and specificity of the magnification method calculated.</p>
</sec>
<sec>
<h3>Results</h3>
<p>The magnification method was found to have a sensitivity of 75 per cent; specificity of 100 per cent; positive predictive value of 100 per cent; negative predictive value of 80 per cent; and an accuracy of 87.5 per cent, in localising palatally placed canines.</p>
</sec>
<sec>
<h3>Conclusion</h3>
<p>The magnification method, which uses the side-to-side difference in the magnification of the crowns of ectopic canines on panoramic radiographs, is adequate for initial assessment of canine position. The magnification method did, however, accurately identify canines that were not palatally placed. Additional radiographs may be required to accurately localise an ectopic canine.</p>
</sec>
</abstract>

Objective
To evaluate the reliability of the magnification method for localisation of palatally placed canines.


Methods
Panoramic radiographs were taken of subjects, aged 10 to 12 years, with unerupted upper permanent canines. Two periapical radiographs (horizontal parallax method) were then used to identify 36 subjects with one palatally placed canine. Differences in the sizes of crowns of the canines on the panoramic radiographs were used to identify which tooth was palatally placed. The observer was blinded to the side with the palatally placed canine. The parallax and magnification results were tabulated, and the sensitivity and specificity of the magnification method calculated.


Results
The magnification method was found to have a sensitivity of 75 per cent; specificity of 100 per cent; positive predictive value of 100 per cent; negative predictive value of 80 per cent; and an accuracy of 87.5 per cent, in localising palatally placed canines.


Conclusion
The magnification method, which uses the side-to-side difference in the magnification of the crowns of ectopic canines on panoramic radiographs, is adequate for initial assessment of canine position. The magnification method did, however, accurately identify canines that were not palatally placed. Additional radiographs may be required to accurately localise an ectopic canine.

Reliability of the magnification method for localisation of ectopic upper canines

Australasian Orthodontic Journal

This work is licensed under the Creative Commons Attribution 4.0 International License.

Objective
To evaluate the reliability of the magnification method for localisation of palatally placed canines.


Methods
Panoramic radiographs were taken of...

Reliability of the magnification method for localisation of ectopic upper canines

Published Online: Dec 14, 2023

Page range: 59 - 62

Received: Jan 01, 2009

Accepted: Apr 01, 2009

DOI: https://doi.org/10.2478/aoj-2009-0010

© 2009 Paul Chalakkal et al., published by Sciendo

This work is licensed under the Creative Commons Attribution 4.0 International License.