Materials to be used as permanent filling materials in Class II restorations are still an essential field of study. This study aims to evaluate the 5-year clinical performance of Class II restorations performed with different bulk-fill restorative materials.

The study was planned as an observational clinical trial. In the study, Class II restorations performed with Tetric Bulk Fill (TBF) and Filtek Bulk Fill (FBF) composites and Equia Forte Fil (EF) will be evaluated. Fifty-one patients and 119 restorations will be included in the study. Restorations will be assessed in terms of modified United States Public Health Service (USPHS) criteria during the 5th year. Cochran Q, Pearson chi-square, and Fisher-Freeman-Halton tests will be used for statistical analysis.

Inclusion Criteria:

• Patients who were;

  1. older than 18 years old
  2. had good general health and oral hygiene
  3. had interface restorations of similar size in their premolars and molars
  4. were able to attend control appointments were included The teeth were determined as follows;
  1. in contact with the opposing tooth
  2. exposed to normal occlusal forces on the dentition
  3. restoration width not exceeding 1⁄2 of the intercuspal distance
  4. normal response to vitality tests without periodontal pathology

Exclusion Criteria:

• Patients with;

  1. poor oral hygiene
  2. those with active periodontal disease
  3. those with severe bruxism
  4. pregnant and lactating women
  5. endodontically treated teeth were excluded from the study

Seventy-nine patients (50 females, 29 males) between the ages of 18 and 53, and 192 restorations meeting the criteria were included in the study.