Effects of Non-surgical Periodontal Therapy on Severe Periodontitis and Hyperlipidemia

Inclusion Criteria: * Subjects had to meet at least one of the following criteria for the diagnosis of hyperlipidemia: triglyceride (TRG) levels \>2.26 mmol/L; high density lipoprotein cholesterol (HDL-C) levels \<1.04 mmol/L; or low density lipoprotein cholesterol (LDL-C) levels \>4.14 mmol/L * Patients with severe periodontitis (stage III/IV) with probing depth (PD) ≥ 6 mm at at least six sites, at least two multi-rooted or two single-rooted teeth in at least one quadrant, and extended bone loss on imaging to the middle or top third of the root. Periodontitis results in the loss of less than or equal to four teeth. Exclusion Criteria: * systemic illnesses * pregnancy or lactation * systemic antibiotics taken within the previous 6 months * use of cholesterol reduction medication during the past 6 months * subgingival scaling and root planing or surgical periodontal therapy in the last year * chewing smokeless tobacco, smoking pipes or cigars 1 or more times per week, or smoking more than 20 cigarettes per week (1 pack per week) in the past 6 months