The goal of this study is to evaluate the clinical, radiographic and periodontal performance of bioactive Giomer Shofu Flow Plus X F03 compared to nanohybrid resin composite restoration in deep subgingival proximal cavities over a period of 12 months.

Inclusion Criteria:

• Adults patients (20-50)
• Good oral hygiene (plaque index 0 or 1 )
• Patient approving to participate in the study
• Absence of parafunctional habits and/or bruxism

Exclusion Criteria:

• Patients with known allergic or adverse reaction to the tested materials.
• Systematic disease that may affect participation.
• Xerostomic patients.
• Bad oral hygiene (plaque index 2 or 3 )
• Heavy smokers
• Patients undergoing or will start orthodontic treatment
• Patients with removable prothesis