Twenty patients referring to periodontics department of Boroujerd Azad university of dentistry after obtaining consent to participate in the research project, which have more than 20 teeth, are over 18 years old and require socket preservation surgery to tooth extraction for the periodontal problem, caries or Fractures were selected.

twenty healthy patients referring to periodontics department of Boroujerd Azad university of dentistry after obtaining consent to participate in the research project, which has more than 20 teeth, are over 18 years old and require socket preservation surgery to tooth extraction for the periodontal problem, caries or Fractures were selected. moreover, divided the socket randomly to two groups(A, B)including A: bone graft with lovastatin and B: bone graft alone, after 3 months with trephine will collect the samples. following the histomorphometric analysis.

Inclusion Criteria:

1. at least 18 years old
2. tooth fracture, root caries
3. Patients are volunteered for placement of the implant

Exclusion Criteria:

1. systemic diseases
2. Pregnancy and breastfeeding
3. malignancy, radiation therapy,
4. history of periodontal surgery during the six months ago.
5. medicine(phosphonates, antibiotic,...)