A self cured bis-acryl auto-mix system with low viscosity composed of Ethoxylated, Bis-gma multifunctional methacrylate esters, glass filler and nanofiller for a simple alternative to traditional materials. Prime-crown produces minimal odor, shrinkage and heat generation. Good wear resistance for better translucency. Obtaining a smooth surface for esthetic appearance and protection again staining with a satisfactory working time