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Case 1. a Panoramic view shows an oroantral fistula between the oral cavity and right maxillary sinus cavity (arrow indicates the gutta-percha cone). Additionally, full impaction of no. 18 was observed in the sinus cavity (circle). b Computed tomography showing right sinusitis and gutta-percha cone for examination (arrow). c The defect was reconstructed with pedicled buccal fat pad. d After 3 months, the operation site was successfully closed and well healed
