Microleakage Performance of Gingiva-colored Composite Resins Used With Different Glass Ionomer Materials

Background This in vitro study aimed to evaluate the microleakage performance of gingiva-colored composite resin restorations applied over different resin-modified glass ionomer base materials on root surface Class V cavities associated with gingival recession. Materials and Methods Class V cavities were prepared on the buccal root surfaces of 28 anterior and 28 premolar human teeth extracted for orthodontic or periodontal reasons. The specimens were randomly assigned according to the base material used: Ionoseal, Glass Liner, I-Liner, or no base material (control group). All cavities were restored with a gingiva-colored composite resin (Amaris Gingiva). After restoration, the specimens were thermocycled and immersed in a 2% basic fuchsin dye solution for 24 hours. The teeth were sectioned bucco-palatinally, and dye penetration was assessed under a stereomicroscope at ×25 magnification. Microleakage scores were statistically analyzed using the Kruskal–Wallis test, followed by Dunn post-hoc analysis with Bonferroni correction. Results No statistically significant differences were observed in microleakage scores among the experimental groups or between the experimental and control groups in either anterior or posterior teeth (p > 0.05). Conclusion Within the limitations of this in vitro study, gingiva-colored composite resin restorations demonstrated comparable microleakage performance when used with different resin-modified glass ionomer base materials. These findings suggest that the choice of glass ionomer base material does not significantly influence the marginal sealing ability of gingiva-colored composite restorations on root surface cavities.