this study aims to evaluate and compare the clinical and radiographical efficacy, operator ease, satisfaction and patient comfort in restoring class II cavities in primary molars using Fender Mate system with T-band system.

Restorations of posterior primary teeth can have a number of issues, including incorrect contact points and proximal overhangs. With the recognition of significance of restoring tooth's right contour and contact, and repair of all tooth surfaces, including proximal walls, different matrix systems were introduced,so this study aims to evaluate and compare the clinical and radiographical efficacy, operator ease, satisfaction and patient comfort in restoring class II cavities in primary molars using Fender Mate system with T-band system.

Inclusion Criteria:

1. Apparently healthy children free from any systemic diseases.

2. Patients showing Frankel's positive and definitely positive behavior.

3. Parent willing to participate in the study and signed on informed consent.

4. Each child has at least two carious primary molars (class II) bilaterally, indicated for composite restoration with criteria as follow: -

   • No history of spontaneous pain or provoked pain.
   • Fully erupted teeth.
   • Fully erupted adjacent tooth.
   • Caries involving two surfaces - proximal and occlusal
   • Absence of clinical signs or symptoms suggesting a non-vital tooth such as sinus tract, soft tissue swelling, mobility or tenderness to percussion.
   • No pathological external or internal root resorption.

Exclusion Criteria:

1. Patients showing Frankel's negative and definitely negative behavior.

2. Children having primary molars with:

   • Caries involving less than or more than two surfaces
   • Extensively damaged teeth
   • Missing adjacent tooth.
   • Mobility.
   • Spaced dentition.