Evaluation of Root Coverage After the Use of Coronally Advanced Flap Either With Advanced Paltelet Rich Fibrin or Subepithilial Connective Tissue Graft in Treatment of Miller Class I and II Gingival Recession.

• Gingival esthetics[ Time Frame: 9 months ]
  Root coverage esthetic score
• Recession width[ Time Frame: 9 months ]
  measured in millimeter
• Clinical attachment level[ Time Frame: 9 months ]
  measured in millimeter
• Width of keratinized gingiva[ Time Frame: 9 months ]
  measured in millimeter
• Probing depth[ Time Frame: 9 months ]
  measured in millimeter
• Gingival thickness[ Time Frame: 9 months ]
  measured in millimeter
• Post-operative pain[ Time Frame: measured daily for the first 2 weeks post- operatively. ]
  Visual analog scale (VAS) Questionnaire
• Patient Satisfaction[ Time Frame: 9 months ]
  Post-Surgical Patient Satisfaction Questionnaire
• Early wound healing[ Time Frame: 1,2,4 weeks post- surgical ]
  Early wound healing index

patients with Miller class I , II gingival recession will be divided into 2 groups (control, intervention).the control one will receive coronally advanced flap with subepithililal connective tissue graft harvested from the palate while the intervention one will have coronally advanced flap with advanced platelet rich fibrin(A-PRF).as it represent a new generation of platelet concentrate allow for better healing and root coverage results. Null hypothesis: In patients with Miller class I and II gingival recession, there is no difference in amount of root coverage (mm) following the application of SCTG+A-PRF compared to CAF+SCTG.

• Procedure: CAF + (A-PRF)
  advanced platelet rich fibrin prepared by low speed centrfugation concept(LSCC) together with coronally advanced flap .
• Procedure: CAF+SCTG
  cornally advanced flap plus subepithilial connective tissue graft harvested from the palate

• Active Comparator: intervention
  CAF+ APRF
• Active Comparator: control
  CAF+SCTG