Background and Objectives: The pursuit of enhanced bond strength between ceramic restorations and dentin has led to the development of immediate dentin sealing (IDS) as a promising technique. However, it is crucial to assess the effect of IDS on microleakage to ensure the long-term success and durability of these restorations. This study aimed to compare the microleakage of ceramic onlays bonded using IDS and delayed dentin sealing (DDS) protocols.Materials and Methods: Twenty recently extracted human maxillary premolars were randomly allocated into two groups (n = 10 each) based on the dentin sealing technique employed. The first group received immediate dentin sealing (IDS), whereas the second group underwent delayed dentin sealing (DDS). Standardized cavities were prepared, and the dentin surfaces were sealed or left unsealed accordingly. Impressions were taken, and temporary restorations were fabricated. The wax patterns were milled, and the onlays were fabricated by heat-pressing technique using lithium disilicate glass-ceramic. The restorations were bonded, thermocycled, and immersed in methylene blue solution. Microleakage was evaluated by examining the degree of dye penetration using a stereomicroscope.Results: The Mann-Whitney U test revealed no significant differences in microleakage between the two groups at the occlusal, palatal, and proximal margins.Conclusions: Within the limitations of this in vitro study, the findings suggest that the IDS technique does not significantly influence the microleakage of ceramic onlays compared to the DDS protocol.
Alkhalil et al. (Fri,) studied this question.