In AI patients, adhesion still remains the first option in order to achieve an early, minimally invasive intervention, and the altered enamel still represents an acceptable substrate for bonding in some AI variants. Many cases have revealed that the direct composite restorations provide satisfactory esthetic and functionality in restoring AI-affected teeth. The objective of this study was to evaluate the clinical performance of composite restorations in posterior teeth in patients afflicted with Amelogenesis Imperfecta using nanohybrid and nanofill composite materials

Inclusion Criteria:

• the patient had to require treatment due to carious lesions in one or more surface of molars and premolars,
• AI diagnosis had to be made, which had to be verified clinically, and also confirmed by anamnestic family history, or clinical examination concerning Witkop's classification

Exclusion Criteria:

• patients with developmental enamel defects of other origins such as fluorosis, molar incisor hypomineralization;
• AI was associated with other oral developmental or systemic disorders, and dental abnormalities such as open-bite, deep-bite, and cross-bite;
• patients who were unable to provide their informed consent.