Abstract: [Summary] Oroantral fistula, defined by abnormal oral-maxillary sinus communication resulted from many factors, is a common disease in oral and maxillofacial surgery. The traditional repair method of oroantral fistula was based on various soft tissue flap grafting. Although it can repair the oroantral fistula, there is a lack of simultaneous repair of bone tissue. With the rapid development of dental implantology, patients with oroantral fistula also require implant restoration of the missing teeth when repairing soft tissue. This poses a new challenge to the treatment of oroantral fistula, which means that both soft and hard tissue need to be repaired. Based on the bag-shaped absorbable membrane invented by the authors, using biomaterials alone, simultaneous repair and regeneration of soft and hard tissues in the area of oroantral fistula can be achieved without autologous bone. This new treatment has the advantages of less invasion, moderate difficulty of operation, reliable clinical effect and easy to be promoted and popularized. Therefore, it is currently favored by more and more doctors and patients. However, due to the uneven clinical skills of dentists, in order to standardize clinical operating standards, ensure medical treatment effects, and reduce postoperative complications, the clinical application and operating specifications of simultaneous repair of soft and hard tissues of oroantral fistula have been proposed in this paper. It was aimed to provide a certain reference and basis for the majority of dentists in the application of this technology and promote its clinical application.

Key words: Oroantral fistula, Absorbable membrane, Repair and regeneration of soft and hard tissues, Standardized operation