• 1.Area under curve (AUC) of clinical attachment level (CAL) gain (0-24 weeks) 2.Extent of linear bone growth (LBG) and percentage of bone fill (%BF) at 6 months. [ Time Frame: 6 months ]
  

• 1.Changes in CAL gain, probing depth and gingival recession at 3 and 6 months. 2.Incidence of adverse events. [ Time Frame: 3 and 6 months ]
  

Sixty eligible patients with periodontal defect will randomly receive either beta-TCP implantation (control group) or PERIOGEN implantation, containing beta-TCP and rhPDGF (drug group). The specified primary and secondary end points related to efficacy and safety will be assessed during 6 months study period.

Inclusion Criteria:

1. Probing depth ≥7 mm at baseline
2. Presence of ≥4 mm vertical bone defect with at least 1 bony wall after surgical debridement.
3. Adequate keratinized tissue to permit complete tissue coverage of defect.
4. Radiographic base of defect ≥3 mm coronal to the apex of the tooth.

Exclusion Criteria:

1. Failure to maintain adequate oral hygiene (plaque index>2)
2. Pregnant and lactating women
3. History of oral cancer or HIV
4. Periodontal surgery on treatment-targeted tooth within the last year.
5. Tooth mobility greater than grade II.
6. Study tooth exhibiting a class III furacation defect
7. Localized aggressive periodontitis
8. Radiographic signs of untreated acute infection at the surgical site
9. Recent history of smoking more than 20 cigarettes/day
10. Known allergy to E.coli-derived products
11. Using an investigational therapy within the past 30 days.