Abstract
BACKGROUND: The aim of this study was to evaluate the effects of different repair materials and blood contamination on the color stability of teeth following external cervical root resorption (ECRR) repair. METHODS: This study included 60 extracted maxillary central incisors. The endodontic access cavity and root canal preparation were performed. The ECRR cavities were created in all samples. The localization of ECRR cavities was in the coronal and buccal part of the root surface. The sample color was assessed using a spectrophotometer by a single operator from a distance of 2 mm above the cementoenamel junction for initial measurement (T0). Then, the master cone was placed in the root canal, and samples were repaired as follows: Group 1:composite resin, Group 2:Biodentine, Group 3:resin-modified glass ionomer cement, Group 4:with blood contamination composite resin, Group 5:with blood contamination Biodentine, and Group 6: with blood contamination resin-modified glass ionomer cement. Measurements were made at 7 days (T7), 30 days (T30), 90 days (T90), and 180 days (T180) after the initial measurement (T0) at the indicated area on the mid-buccal surface of the tooth. RESULTS: Blood contamination significantly affected the ΔE value, causing discoloration at all time intervals. The composite resin and RMGIC without blood contamination did not exhibit clinically observable discoloration (ΔE < 3.7) at T7, T30, and T90 time intervals; however, they showed discoloration (ΔE ≥ 3.7) at T180. While Biodentine without blood contamination did not show discoloration at T7 or T30 (ΔE ≥ 3.7), it showed discoloration at T90 and T180 (ΔE < 3.7). The composite resin and Biodentine with blood contamination showed clinically observable discoloration (ΔE ≥ 3.7) at all time intervals. While RMGIC with blood contamination showed clinically observable discoloration at T30, T90, and T180 intervals, it did not show discoloration at T7. CONCLUSION: This study reported that blood contamination of the ECRR cavity during repair resulted in tooth discoloration. Biodentine had the potential to cause more visible color change.