Periodontitis is a highly prevalent disease worldwide. Obstructive sleep apnoea (OSA) is a commonly occurring disorder that is characterized by repeated disruptions in breathing during the sleep, and mouth breathing is a frequent trait found among the patients with OSA. A connection between periodontitis and obstructive sleep apnoea (OSA) is plausible, but it has received a minuscule consideration. We intended to analyse the hypothesis that OSA is associated with the onset and progression of periodontal disease. This study is meant to research the strength of association between periodontitis and risk for OSA. Method: Patients with moderate or severe periodontitis were enrolled as cases in this study while subjects with gingivitis or slight periodontitis were enrolled as controls. Patients underwent a full mouth periodontal examination that included probing pocket depths and clinical attachment levels evaluation at 6 sites per tooth. Risk for OSA was evaluated by the OSA screening questionnaire, which assesses self–reported snoring, excessive daytime sleepiness, and witnessed apnoea during sleep and history of hypertension and diabetes. Demographic, general health and orofacial characteristics were recorded that are considered putative predictors of either periodontitis or OSA. Results: The results showed that out of total 150 patients examined, 34.7% subjects of control group (n=75), 21.6% males and 47.4% females were at a higher risk of OSA, with higher prevalence in females with p=0.019 (statistically not significant). Among the case group (n=75), 88.1% males and 90.0% females with chronic periodontitis showed an increased risk of OSA, with equal prevalence between males and females (p=0.695). Cases were more likely to be at high risk for OSA than controls. Conclusion: A considerable association was noticed between moderate or severe periodontitis and risk for OSA

Keywords : Obstructive Sleep Apnoea (OSA), Chronic Periodontitis, Sleep Disruption, Gingival Diseases, Periodontal Medicine