Received: 27 January 2020
Accepted: 29 April 2020
First Online: 1 July 2020
Ethics approval and consent to participate
: The protocol of the study was approved by the internal review board (IRB no.: 00010555) of the Faculty of Dentistry, Alexandria University, in accordance with the Declaration of Helsinki, and signed written consents were taken from the patients prior to the study.
: The consent of authors was taken before submission.
: The authors declare that they have no competing interests.