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. 2013 Aug 14;9:21. doi: 10.1186/1746-160X-9-21

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Copyright © 2013 Krieger et al.; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Measurement of the panoramic radiographs: root and crown lengths and the calculation-formula for the relative change of the root-crown-ratio (RCR) during orthodontic treatment: post-treatment RCR relative to pre-treatment RCR (rRCR) in percentage; (CEJ = cemento-enamel junction) [7,10].