compare the effect of application of A-PRF in socket preservation after atraumatic tooth extraction and natural healing regarding to bone remodeling . Null hypotheis, after atraumatic extraction, socket with advanced PRF has no difference with socket with blood clot in primary outcome

Inclusion Criteria:

• The inclusion criteria are as follow :

  • patients with an unremarkable medical history
  • subjects with at least one site bordered by minimum of one tooth.
  • Nonsmoker
  • Teeth with root fracture, teeth with failed endodontic therapy or advanced caries
  • Intact extraction socket with no dehiscence or fenestration.
  • The buccolingual thickness of the buccal plate of bone in surgical area is 1 mm or more

Exclusion Criteria:

• Patients with systemic diseases.
• Patients with presence or history of osteonecrosis of the jaws, with use of bisphosphonates, exposure to head and neck radiation, chemotherapy.
• patients with large distinct pre-apical pathology