Microleakage in Class V preparations restored with Conventional vs Silorane

Objective: To compare the difference in microleakage using conventional and Silorane composites using dye penetration method. Background: Dental composites are increasingly being used by dentists.With improvement in adhesive technology, problems associated with composites (such as poor colour stability, inadequate mechanical properties) have been largely overcome. However, microleakage due to polymerization shrinkage still remains a challenge. Silorane (3MESPE) based composites are claimed to have less than 1% polymerization shrinkage, which would potentially decrease the microleakage and hence could resolve this long standing issue. Methods: A total of 63 teeth that fitted the criteria were selected and standardized class V cavities were prepared. 55 teeth were included in final analysis.Teeth were randomly divided into three groups (A,B&C) group A restored with conventional composite (ValuxPlus) following total etch protocol, Group B was restored with conventional composite following self etch protocol and group C were restored with silorane based composite (FiltekP90) sample were thermo cycled 200 cycles between 5-55 °C ±2°C with dwell time of 60 seconds. Teeth were stained with methylene blue and were sectioned and viewed under dissection microscope, microleakage was evaluated on both occlusal and gingival surfaces. Kruskal Wallis test was applied to compare the microleakage values of the three groups. Results: Inter examiner reliability was evaluated using kappa score and was acceptable (61-78%). Total etch group performed statistically better (p<0.001) at occlusal margin and marginally statistically significant (p=0.05) at the gingival margin compared to self etch conventional and Silorane group Conclusion: Silorane composite did not perform better than conventional composites.