Oral dryness is common in persons with untreated obstructive sleep apnoea (OSA) as well as in those using positive airway pressure (PAP). OSA with or without PAP treatment could therefore be a risk factor of dental caries.

Objectives: To describe and compare the prevalence of dental caries among persons with or without PAP-treated OSA.

Methods: Cross-sectional data derived from a clinical examination of 121 adults without OSA, and with or without long-time experience of PAP treated OSA (>10 years) were used. The participants responded to a questionnaire and were clinically and radiographically examined. Decayed, missing, and filled teeth, decayed surfaces, gingivitis and presence of dental plaque were registered. Descriptive analyses were performed to describe dental caries prevalence among groups. To compare groups, one-way ANOVA and Kruskal-Wallis tests was conducted.

Results: Participants (52% females, mean age 69.5±5.8 years) were categorised into groups based on OSA status; non-OSA (n=49), non-PAP-treated OSA (n=38), and PAP-treated OSA (n=34). Dental caries prevalence showed no statistically significant differences among groups, except for occlusal caries, where the PAP-treated OSA group had a higher mean compared to the non-OSA group (p=0.033). Most participants did not report xerostomia, but the highest prevalence was found in the non-PAP-treated OSA group (31.6%).

Conclusions: The prevalence of dental caries was slightly higher in persons with PAP treated OSA compared to non-PAP-treated OSA and persons without OSA, but the results were not statistically significant.