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von Arx, Thomas; Käch, Simon; Suter, Valerie G. A.; Bornstein, Michael M. (2020). Perforation of the maxillary sinus floor during apical surgery of maxillary molars: A retrospective analysis using cone beam computed tomography. Australian endodontic journal, 46(2), pp. 176-183. Wiley 10.1111/aej.12413
