AUTHOR=Özcan Mutlu TITLE=Grand Challenges in Reconstructive Dentistry JOURNAL=Frontiers in Dental Medicine VOLUME=2 YEAR=2021 URL=https://www.frontiersin.org/journals/dental-medicine/articles/10.3389/fdmed.2021.604776 DOI=10.3389/fdmed.2021.604776 ISSN=2673-4915