In the study, Class II restorations will be performed with G-aenial Universal Injectable (GC/ Tokyo, Japan), Grandio Flow (VOCO/ Germany), and Clearfil Majesty Flow (Kuraray/ Japan) composites will evaluated. Restorations will be assessed according to modified USPHS criteria in 1st week, 6th months, and 12th months from the placement date. The Chi-square test will used for statistical analysis of the difference between the groups, and the Cochran Q test will used for the significance of the difference between time-dependent changes within each group (p<0.05).

Inclusion Criteria:

A patient presenting with;

1. over 18 years of age
2. a normal periodontal status and good general health
3. proximal caries that are similar in size to premolar and molar teeth
4. vital teeth
5. teeth in contact with the opposing tooth and subjected to normal occlusal forces
6. attend follow-up appointments

Exclusion Criteria:

1. poor oral hygiene status
2. those with severe or chronic periodontitis
3. absence of adjacent and antagonist teeth
4. potential behavioral problems (e.g. bruxism)
5. allergy to any product used in the study
6. exposure of the pulp during cavity preparation
7. systemically unhealthy
8. pregnant and lactating women