Effect of Unfilled Resin Sealant Surface Coating on the Marginal Leakage of Two Cervical Restorations Viz Light Curing Nanoglass Ionomer and Nanoceramic Composite-An In vitro Stereomicroscopic Dye Penetration Study

The purpose of this study is to compare the marginal leakage of two aesthetic cervical restorative materials viz the newly introduced light cured nano glass ionomer cement and nano ceramic composites, and also to evaluate the effect of unfilled resin sealant coating on marginal leakage of these aesthetic restorations. Thirty freshly extracted human upper premolars were used for the study. Class V cavities were prepared on the buccal and lingual surface of each tooth, with occlusal margin in enamel and cervical margin in cementum. The teeth were randomly divided into two groups of fifteen teeth each. Cavities of group 1 were restored with nano composite and group 2 were restored with light curing nano glass ionomer cement, following manufacturer’s instructions. After rinsing and drying one thin coat of unfilled resin sealant was applied only on to the surface of lingual restoration and were light polymerized for 15 seconds. The procedures for dye penetration using Methylene Blue were followed and examined under stereomicroscope for evaluation. The data collected were analyzed statistically using Mann-Whitney U test. Nanocomposite recorded less microleakage than nanoglass ionomer cement at occlusal and cervical margins. Results showed that cervical margin had significantly more microleakage than occlusal margin. Palatal surfaces, which were coated with resin sealant showed significantly less dye penetration in comparison with buccal surfaces in both groups. Though the coating of unfilled resin sealant did not completely eliminated microleakage, unfilled resin sealant was definitely effective in reducing microleakage of the esthetic restorations, especially on the gingival margin of the class V restorations.