Fava L R
Int Endod J. 1993 Sep;26(5):306-10. doi: 10.1111/j.1365-2591.1993.tb00576.x.
A case is reported in which a perforation of the sinus floor of the maxillary sinus occurred with extrusion of a calcium hydroxide paste during routine root canal treatment of a maxillary premolar. All clinical manifestations are described as well as the results of a follow-up evaluation.