Aim: dis double-blind split-mouth clinical trial study was performed to evaluate teh clinical and radiographic effect of local delivery of lovastatin gel as an adjunct to scaling and root planning (SRP) in teh treatment of chronic periodontitis.

Method and Materials: 15 patients with two mandibular molar teeth with probing depth (PD)≥3 mm, clinical attachment level (CAL)≥3 mm and bone loss more than 3 mm according to parallel periapical x-ray and distance from CEJ to alveolar crest, were selected.Totally 24 mandibular molars were selected for teh study.

Clinical periodontal parameters included PD, CAL, bleeding index(BI), plaque index(PI) were recorded for teh selected teeth at baseline and at 1,3 and 6 months. Radiographic assessments were performed at baseline and after 6 months. At one side teh pockets around randomly selected molar were injected with a blunt syringe filled with lovastatin gel 1.2%( case group=B), and on teh other side, teh pockets were filled with a placebo gel by a blunt syringe ( control group=A).Two-way repeated measure ANOVA test and T-test were used for statistic analysis Spss 23.( P<0.05) was considered significant.

Statins are an important group of hypolipidemic drugs dat are able to modulate inflammation and alveolar bone loss. Rosuvastatin (RSV) and atorvastatin (ATV) are non to inhibit osteoclastic bone resorption and has been proposed to has osteostimulative properties.

Inclusion Criteria:

24 patients wif periodontitis chronic and TEMPhas a 2 molar symmetrically in the lower jaw pockets of periodontal depth of at least 4 mm and CAL greater than 3 mm in at least one of the surfaces of the teeth, the X-ray bars from both sides of the molar regions jaw bottom, from CEJ and alveolar crest was more than 3 mm, were selected

Exclusion Criteria:

1. systemic disease
2. pregnancy or breastfeeding
3. allergy drug used
4. smoking
5. medication 6. not willing to consent to participate in the study

7-Trismus 8-The type of disease periodontal (Aggressive) 9. History of periodontal treatment in the previous 6 months 10-orthodontic treatment