Ethics approval
All procedures performed in this study involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. This research was performed and reported according to CONSORT 2010 guidelines. Before the commencement of the study, ethical approval was obtained from the Institutional Review Board (IRB D20-006–001) of Kyung Hee University Dental Hospital.