Nasal cavity perforation by implant fixtures: case series with emphasis on panoramic imaging of nasal cavity extending posteriorly.

"Declarations Ethics approval and consent to participateThe study was approved by the Institutional Review Board of the Dental Hospital of Seoul National University (IRB No. ERI21035). All procedures followed were in accordance with the ethical standards of the responsible committee on human experimentation (institutional and national) and with the Helsinki Declaration of 1975, as revised in 2008. Informed consent was obtained from all patients for being included in the study. Competing interestsThe authors declare no competing interests. Competing interests The authors declare no competing interests."

"Funding This work was supported by grants from the Foundation of Wonkwang University in 2021. The funder had no role in the design of the study, data collection, analysis, interpretation of data and writing the manuscript."