Article ID: 24-0014
Purpose: The study aimed to compare the gap formation between dentin and resin composite using optical coherence tomography (OCT) and the leakage test.
Methods: Three cavities were prepared for each bovine tooth (coronal, cervical, and root). Cavities were filled by Scotchbond Universal Plus Adhesive and Filtek Supreme Flowable Restorative. After 24 h storage in water, the interface was analyzed at the bottom of the cavity using OCT. They were then cut and immersed in 50% ammoniacal silver nitrate (AgNO3) solution and photo-development solution for a leakage test. Next, energy-dispersive X-ray spectroscopy (EDS) assessed the cavity bottom interface. Two-dimensional (2D) images of both devices were analyzed to calculate the sealed interface percentage (SI%). The mean SI% values for adhesive were statistically analyzed by multiple comparisons using the Kruskal-Wallis test followed by Dunn's test with Bonferroni correction, with the significance level set at α = 0.05.
Results: No significant differences were observed among the three sites for either OCT (P < 0.05) or EDS (P < 0.05). Significant differences were observed between OCT and EDS at each site (P = 0.005, P < 0.001, P = 0.004, respectively). When comparing OCT and EDS, EDS detected significantly more white lines (lower SI%) in all locations.
Conclusion: The OCT device showed different detection results compared to the conventional EDS-based leakage method. On the other hand, there was no significant difference in the measurements across different sites of the tooth with either method.
