Objective : The aim of this study was to evaluate the efficacy of Rehrmann’s flap in oro-antral communication, acute and chronic oro-antral fistula along with its Critical evaluation, indications and contra- ndications, complications and compare with other studies. Study Design : In this prospective study, 20 patients with oro-antral communication, actue and chronic oro-antral fistula’s, treated with modified rehrmann’s flap is presented. Out of which nine cases were oroantral communication, seven cases were acute oro-antral fistula and four were of the chronic oro-antral fistula. Results : The successful closure of oro-antral communication, acute & chronic oro-antral fistula’s were treated by modified Rehmann’s flap. Caldwell luc & intranasal antrostomy were carried out whenever indicated. recurrence was seen in one case of chronic oro-antral fistula which was carried out by palatal flap operation. One patient complained of pain two months after surgery which was treated by symptomatic treatment & one patient failed to come for the follow-up. Conclusion : This study concludes that, modified buccal Rehmann’s flap is effective in oro-antral communication. Acute oro-antral fistula gives better results following the control of sinus infection while the chronic oro-antral fistula there can be some failures.  

Key words: Oro-antral fistula; Oro-antral communication.