Background: Smoking is the most important environmental risk factor for periodontal disease. Elevated levels of serum-soluble CD44 (sCD44) have been detected in smokers and also have been recognized as a diagnostic marker in some smoking-induced diseases. The present study investigates the salivary sCD44 profiles of smokers and non-smokers with and without chronic periodontitis in response to scaling and root planing (SRP).
Methods: The study included 44 subjects divided into two groups: 22 patients with chronic periodontitis and 22 periodontally healthy subjects. Both groups were equally subdivided into smokers (n = 11) and non-smokers (n = 11). Plaque index, gingival index, probing depth, and clinical attachment level were recorded only for chronic periodontitis patients. Salivary samples were collected from all 44 patients at baseline and after 1 month of SRP from the 22 chronic periodontitis patients. Assay for salivary sCD44 was carried out by enzyme-linked immunosorbent assay.
Results: Baseline salivary sCD44 profiles were significantly higher when smokers were compared to non-smokers in both chronic periodontitis patients and the control subjects (P <0.001) with the highest levels recorded in smokers within the chronic periodontitis group. There was a significant decline in salivary sCD44 levels after treatment in the chronic periodontitis group for both smokers and non-smokers (P <0.01); however, the difference between groups was insignificant.
Conclusions: Salivary sCD44 might be considered a biomarker of periodontal destruction in smokers and non-smokers. The research opens the door to further research into a role for CD44 as a diagnostic marker for periodontitis.
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