Development of composite resin materials is considerably continuous and aims to reach a high quality of performance and long-term longevity offering an ease of work and saving of clinical time. A new material Vertise FlowTM having properties of self-etching and self-bonding have been introduced in the last few years in an attempt to reduce the micro leakage which is one of the major problems associated with composite resin filling materials. Microleakage of this new material was evaluated in the present study and compared to the other conventional composite materials which are Filtek Z250, Riva resin modified glass inomer cement, and sure full SDR. When used as an intermediate layer in class II composite restoration