Objective: Periodontitis is a multifactorial disease that affects a wide range of populations. However, its pathogenesis remains unclear. miRNAs are now considered potential diagnostic markers for many inflammatory diseases. Thus, the aim of this study was to assess the expression of microRNA-223(miRNA-223) and microRNA-214 (miRNA-214) in gingival crevicular fluid (GCF) of smoker and nonsmoker with periodontitis.

Materials and Methods: We conducted a prospective study among 42 participants: 14 healthy controls, 14 nonsmoker periodontitis participants, and 14 smoker with periodontitis. Eligibility criteria for inclusion were consecutive adults, aged 20-60 years, with stage III periodontitis grade B/C and no systemic diseases. All consenting participants had gingival crevicular fluid samples collected after diagnosis to assess miRNA-214 and -223 by quantitative real-time polymerase chain reaction assay.

Inclusion Criteria:

• both genders
• age from 20 to 60 years
• no more than 4 teeth lost due to periodontitis
• systemically free participants

Exclusion Criteria:

• Pregnant or lactating female
• participants with a history of an inflammatory or immunological disease
• history of any current medication

individuals were recruited from the outpatient clinic of the department of periodontology