Keypoints and Key wordsKeypoints :Many reports suggest that odontogenic sinusitis cause critical orbital abscess with high risk of ophthalmologic sequelae due to the pathogenic potential of anaerobic bacteria.This study aimed to compare the outcomes between odontogenic sinusitis and non-odontogenic sinusitis after management of orbital abscess in an adult population.The rates of revision surgery and visual sequelae were significantly higher in the odontogenic sinusitis group.Dental etiology of the sinusitis was overlooked in four patients (24%) of the odontogenic sinusitis group. Hence, dental cause of sinusitis has to be systematically sought and treated.Key words: Abscess, Blindness, Odontogenic infection, Orbital cellulitis, Sinusitis.Ethical considerationsThe protocol was approved by the local ethics committee. All participants gave informed consent.Main TextINTRODUCTIONOrbital cellulitis is a rare acute infection of the orbit and its contents that occurs mostly in children. The main cause is sinusitis (1). It is usually classified according to Chandler’s classification based on location and severity (2). Among orbital cellulitis, abscess formation occurs in 30% of the patients (3). Associated neurological acute complications, such as empyema or cerebral abscess, are rare but life-threatening. Long-term complications can be dramatic, notably blindness and cosmetic sequelae. The treatment includes hospitalization, intravenous antibiotics and surgery. The surgical procedure can combine endoscopic endonasal approach and external approach.According to the scientific literature, only 10% of sinusitis are odontogenic (4). Some authors suggest that odontogenic sinusitis (OS) cause critical orbital abscess (5) with higher risk of ophthalmologic sequelae (6), due to the pathogenic potential of anaerobic bacteria.This study aimed to compare the outcomes between OS and non-OS after management of orbital abscess in an adult population.MATERIALS AND METHODS