Effect of Different Light Curing Distances on Surface Hardness of Two Different Bulk-Fill Flowable Resin-Based Composite Materials

Abstract

Objectives: To evaluate the effect of different light curing distances(0,2,4&6mm)on surface hardness and degree of conversion for two bulk-fill flowable resin-based composite materials(Filtek&X-tra base). Method:20 disk shaped samples(4x4mm) of each composite type for each test were prepared. Light curing was performed with LED unit for 20s.Vickers hardness & degree of conversion tests were performed on both top&bottom surfaces of each specimen. Results: Statistical analysis revealed that irradiation distance had significant effect on both VHN&DC. Conclusion: Irradiance distance is important factor to consider to obtain adequate polymerization of flowable BF-RBCs.