Funding for this research was provided by:
Received: 12 November 2020
Accepted: 8 December 2020
First Online: 7 January 2021
Ethics approval and consent to participate
: Verbal consent. Reason: extracted teeth were collected from faculty of dentistry, Cairo University, where all patients accept that their extracted teeth for orthodontic purpose to be used in research. It was approved by the Ethics committee (Ethics committee, National Research Centre approval number 16/344),
: Not applicable.
: No competing interests.