All content published in the Journal of Dental School, Shahid Beheshti University of Medical Sciences, is open access and available under the Creative Commons Attribution-NonCommercial-NoDerivatives (CC BY-NC-ND) license (https://creativecommons.org/licenses/by-nc-nd/4.0/). This license allows personal, non-commercial use and sharing of the materials as long as proper attribution is given, and the content is not modified. For any uses beyond these terms, please contact the editorial office.