3M RelyX Unicem 2 Self-Adhesive Resin is a dental cement trusted by dentist worldwide. It is clinically proven and simple to use with next-generation fomula easy-to-use delivery system. 3M Unicem 2 automix is strong and moisture tolerant and has virtually no post-op sensitivity for the patient. With its optimal consistency and convenient dispenser system, Unicem 2 resin is efficinet for dental practitioners. There is no etching, priming, or bonding required unless you use 2- or 3- unit Maryland bridges and a 3-unit inlay/onlay bridges. If you use this method, some etching is required for to increase surface bonding.