This study is conducted to evaluate the clinical performance of class I reinforced glass ionomer restorations (Zirconomer Improved and Equia Forte Fil)

Inclusion Criteria:

• Normal occlusal relation with normal dentition.
• Absence of pain from the tooth to be restored.
• Absence of any active periodontal and pulpal diseases from the tooth to be restored.
• Medium-sized (buccolingually and mesio-distally) occlusal carious lesions extending into dentin.

Exclusion Criteria:

• Patients with a history of tooth sensitivity.
• Patients with bruxism.
• Defective restorations adjacent or opposing to the tooth.
• Abutment teeth used for fixed or removable prosthesis.
• Patients who refused to sign the consent form.
• Inability to return to recall appointments