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. 2021 Jun 16;57(6):626. doi: 10.3390/medicina57060626

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Another case of oro-antral fistula (OAF) and oro-antral communication (OAC) closure using an absorbable collagen membrane in the form of a pouch. (A) Pre-operative clinical view of #16. (B) Incision design for epithelial patency soft tissue removal. (C) Maxillary sinus membrane perforation and an OAC (≥6 mm in diameter). (D) Collagen membrane application in the sinus by making a pouch shape. (E) Sinus bone graft with allogenic bone material. (F) Suturing. (G) Post-operative radiograph of #16. (H) Healing condition at 2 weeks post-operatively. The OAF was treated. (I) Radiograph at 6 months post-operatively. Increased radiopacity was observed at the OAC site.