Comparative Evaluation of Fifth and Sixth Generations of Dentin Bonding Agents on the Prevention of Tooth Discoloration Induced by White Mineral Trioxide Aggregate

Mineral trioxide aggregate (MTA) can cause coronal discoloration after the regenerative endodontic therapies. Prevention of the MTA-induced discoloration in the esthetic zone is of great importance for patients and clinicians. The present study aimed to evaluate the effectiveness of different types of dentin bonding agents (DBA) in preventing crown discoloration caused by white MTA (WMTA). A total of 36 extracted maxillary incisors were selected. After performing the endodontic procedures, the teeth were divided into 3 groups. In groups 1 and 2, before applying the WMTA in access cavity, Adper Single Bond (SB) and Clearfil SE Bond (CSE) were used for 5th and 6th, respectively. While the access cavity was impregnated with WMTA in group 3. In these three groups access cavities were sealed. The color of the samples was examined by a spectrophotometer. The ∆E was calculated after 2 months storage in incubator and physiologic serum. The collected data were analyzed with the help of the Kolmogorov-Smirnov, independent t-test, and Tukey's range test. A p-value less than 0.05 was considered statistically significant. There was no significant difference between WMTA+SB and WMTA+CSE (P=0.546). However, the ∆E of the WMTA group between WMTA+SB and WMTA+CSE was significant (P<0.001). The DBAs can prevent MTA-induces discoloration. Although differences between 5th and 6th generations of DBAs were not statistically significant, the samples prepared with 6th generation of adhesives showed lower crown discoloration.