Autologous Periodontal Ligament Stem Cells(Fourth Military Medical University)

The purpose of this clinical trial is to both clarify the efficiency of autologous periodontal ligament (PDL) stem cells to regenerate periodontal tissue in periodontitis patients with deep intraosseous defects (>5 mm) and to confirm the safety of using autologous stem cells in clinical periodontal regenerative medicine. This is a single-centre, randomized, placebo-controlled study. This study has been approved by the ethical committees of School of Stomatology, Fourth Military Medical University. The study will be conducted according to the Declaration of Helsinki.