SIRT1 and periodontitis: The analysis revealed that the SIRT1 rs3818292 AG genotype was associated with 2.2-fold increased odds of periodontitis development under the codominant and overdominant models in the over-60-year-old group (OR = 2.216; CI = 1.322–3.714; p = 0.003; and OR = 2.179; CI = 1.301–3.650; p = 0.003, respectively).