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Article History

Received: 4 February 2021

Accepted: 19 July 2021

First Online: 11 August 2021

Declarations

:

: Ethical approval was obtained from the Scientific Research Committee of Changsha Stomatological Hospital (CKY2020-0605). This clinical study was a retrospective study and only clinical data and imaging data of patients were collected. There was no intervention in the treatment plan of patients, no risk to the physiology of patients, no disclosure of personal privacy, and exemption from informed consent was approved by Ethics Committee of Scientific Research Department of Changsha Stomatological Hospital.

: Not applicable.

: The authors declares no conflict of interest related to this study.