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Article History

Received: 6 January 2019

Accepted: 22 February 2019

First Online: 29 March 2019

Ethics approval and consent to participate

: Not applicable. But, for the clinical radiographic pictures included, we have received a statement of ethics approval was provided by the Department of Oral and Maxillofacial Surgery at Seoul National University Dental Hospital, with the approval of the Institutional Review Board of Seoul National University (S-D20170005).

: Written informed consent was obtained from the patients for the publication.

: The author declares that there are no competing interests.

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