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The journal provides immediate free access to the full text of articles in PDF format. This is an open access article distributed under the terms of the Creative Commons Attribution (CC BY) License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. (https://creativecommons.org/licenses/by/4.0/). The Authors retains copyright of the article published in International Journal of Dentistry Research. The authors grant BIOMED RESEARCH PUBLISHERS a license to publish the article with a Creative Commons Attribution 4.0 International License.