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Article History

Received: 11 February 2019

Accepted: 18 March 2019

First Online: 12 April 2019

Ethics approval and consent to participate

: Retrospective data collection was done for the comparison with membrane-applied groups. Retrospective unnamed data collection was approved by the institutional review board of Gangneung-Wonju National University Dental Hospital (IRB No. 2018-003).

: This manuscript does not contain any individual person’s identifier (including individual details, images or videos).

: Spencer biomedical technology, which manufactures TDI, provided the membrane for free and provided personnel support via an investigator-sponsored research agreement to YBE. The authors declare that the authors have no competing interests as defined by Nature Research, or other interests that might be perceived to influence the results and/or discussion reported in this paper.

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