The aim of this study is; detection of interleukin(IL)-38, IL-36 gamma(γ) , IL-17 and matrix metalloproteinase(MMP)-9 levels in gingival crevicular fluid (GCF), saliva and serum samples of periodontally healthy, gingivitis and periodontitis patients and the possible correlation between these values and clinical parameters of periodontal diseases. Materials and methods: Samples were obtained from 90 systemically healthy non-smoker individuals with periodontitis (P, n=30), gingivitis(G, n=30) and healthy periodontium (S, n=30). Full-mouth clinical periodontal measurements including probing depth (PD), clinical attachment level (CAL), bleeding on probing (BOP), gingival index (GI) and plaque index (PI) were also recorded. Enzyme-linked immunosorbent assay (ELISA) was used to determine IL-38, IL-36γ, IL-17 and MMP-9 levels in the biological samples.

Inclusion Criteria:

• Systemically healthy (The determination of healthy volunteers will be based on the statements of the patients in the anamnesis. No additional examinations will be made.)
• At least twenty permanent teeth in the mouth
• Non-smoker
• No medication for continuous use
• Those who have not used antibiotics, anti-inflammatory and systemic corticosteroid drugs in the last 6 months.
• Not in pregnancy or lactation period.
• For the periodontitis group that has not received periodontal treatment in the last 6 months

Exclusion Criteria:

• Any oral or systemic disease
• Regularly using a systemic medication
• During pregnancy or lactation
• Received periodontal treatment within the last 6 months.
• Those who received antibiotic, anti-inflammatory or systemic corticosteroid medication in the last 6 months
• Smokers