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Article History

Received: 1 July 2020

Accepted: 16 October 2020

First Online: 15 December 2020

Compliance with ethical guidelines

:

: K.A.A. Mandour, M.A. Tawfeek and M.A. Montasser declare that they have no competing interests.

: All procedures performed in studies involving human participants or on human tissue were in accordance with the ethical standards of the institutional and/or national research committee and with the 1975 Helsinki declaration and its later amendments or comparable ethical standards. The research ethics committee of Faculty of Dentistry, Mansoura University, Mansoura, Egypt, had approved the study (Reference number: m‑08-07-10-20). Written informed consent to participate and for publication was obtained from each subject or his/her guardian before being enrolled in the study.