This study aims to evaluate the one-year clinical performance of Class II restorations made with high-filling injectable and condensable universal composite resins.

The study included 71 patients and 140 restorations. It used G-aenial Universal Injectable (GCI), G-aenial A'CHORD (GCA), Tetric Prime (TP), Filtek Ultimate (FU) composites, and the Clearfil SE Bond adhesive system. Restorations were evaluated and scored according to modified USPHS criteria at seven days, six months, and one year. Chi-square and Cochran Q tests were used for statistical analysis (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