This research proposal is evaluating the clinical performance of using self-adhering flowable resin composite in repairing old occlusal defective resin composite versus conventional flowable resin composite restoration over 18 months.

Inclusion Criteria:

• Patients (18-35 y)
• patients with defective resin composite class I restorations that need repair.
• dental motivated patients who attends regularly.
• Vital posterior teeth with repairable defective resin composite class I restorations.
• Localized marginal defect or marginal staining FDI 3& 4.
• Teeth with no or minimum mobility & healthy peridontium.
• No history of any irreversible pulpal pain or necrosis in the teeth to be restored.

Exclusion Criteria:

• • Patients with defective restorations that dictate replacement

  • Uncooperative behavior limits the isolation techniques throughout the procedure.
  • Presence of parafunctional habits.
  • Patient with history of systemic medical disease, or any other serious relevant problem.
  • High caries risk patients. Periodontal disease that may affect the prognosis of the restoration or the tooth itself.
  • Fractured or visibly cracked teeth.
  • Symptoms of any pulp pathosis.
  • Defective resin composite restorations that dictate replacement.

double ( participants, outcomes assessor) participants and both assessors will be blind to the type of material used