This work aimed to report a surgical rehabilitation of a bucosinusal fistula resulting from myiasis from closure with a Bichat's fat pad. An 81-year-old female patient came to our dental office with sequelae due to myiasis. During the clinical examination, bucosinusal communication was observed, and with the help of cone-beam computed tomography, we observed a loss of bone structures of the middle third in the right face hemi, reaching the zygoma and zygomatic pillar region. Immediate treatment was the rehabilitation of the oroantral fistula region with pediculated flap of the buccal fat pad, which is highly vascularized. Adipose tissue exposed by blunt dissection and without major tensions, suffers metaplasia serving as a bed for epithelium growth from 2 to 3 weeks without the need for coating with skin grafts. In conclusion, the use of Bichat´s ball was a successful alternative to rehabilitation of the oroantral defect. This work aimed to report a surgical rehabilitation of a bucosinusal fistula resulting from myiasis from closure with a Bichat's fat pad. An 81-year-old female patient came to our dental office with sequelae due to myiasis. During the clinical examination, bucosinusal communication was observed, and with the help of cone-beam computed tomography, we observed a loss of bone structures of the middle third in the right face hemi, reaching the zygoma and zygomatic pillar region. Immediate treatment was the rehabilitation of the oroantral fistula region with pediculated flap of the buccal fat pad, which is highly vascularized. Adipose tissue exposed by blunt dissection and without major tensions, suffers metaplasia serving as a bed for epithelium growth from 2 to 3 weeks without the need for coating with skin grafts. In conclusion, the use of Bichat´s ball was a successful alternative to rehabilitation of the oroantral defect.