Figure 6.

(A) Intraoral photograph prior to surgery. The sinus tract was still there (arrow). (B) The triangular flap was reflected from tooth number 11 to number 23 with vertical release over the distal line angle of tooth number 23. (C) The perforation site was detected (mesial–labial, middle third). (D) A bone window was created with a high-speed bur, and the soft tissue was curetted and sent for examination. (E) The perforation area was restored with mineral trioxide aggregate under a microscope. (F) Suturing with four stitches.