The aim of this study is to compare the clinical results of combining a pedicle connective palatal flap with a trapezoid buccal flap with the standard buccal flap alone in the closure of oro-antral fistula (OAF), and the buccal flap combined with leukocyte and platelet rich fibrin.

Inclusion Criteria:

Eligible population among those older than 18 y.o, systemically healthy, with a diagnosis of OAC (OroAntral Communication), or with a strong pre-extractive radiographic suspicion of potential OAC, and associated symptoms (varying among cheek pain with nasal obstruction, purulent rhinorrhea, foul odor, foul taste, headaches, anterior maxillary tenderness, and postnasal drip) .

Exclusion Criteria:

i) received antibiotic therapy in the last 3 months ii) requiring anticoagulation therapy iii) had systemic diseases that could interfere with oral tissue healing process/bleeding iv) were using bisphosfonates v) were pregnant vi) had mental/physical disabilities vii) underwent radiation treatment to the head or neck region.

Eligible patients with a clinical diagnosis of oroantral fistula among those referring to the Dental department of Siena University Hospital