space between to secure prosthetic bridge 16 in the mouth of the patient in a location formerly occupied by all natural teeth the abutment may be natural teeth shaped to fill the bores or implant abutments the edentulous space is the space formerly occupied by a natural tooth an example of steps for bonding resin nano ceramic cad cam blocks with methacrylated based light cured restoratives follows 1 roughen the resin nano ceramic site to be added to with a coarse diamond or stone or air abrade sandblast with 50 u03bcm aluminum oxide particles at 80 psi at an approximately 0 39 inches distance clean the roughened block in an ultra sonic cleaner with normal detergent type cleaner 2 brush on a one step self etch adhesive system which could be either a 1 or 2 component system if 1 component most common chemical composition is hydroxyethyl methacrylate hema initiator and inhibitor with 1 to 10 weight fillers 2 components commonly have approximately 50 water and a co solvent mono methacrylates and dimethacrylates after being brushed blow the area gently dry for 2 to 5 seconds for solvent evaporation 3 self cured systems should be left indisturbed for 1 minute until step 4 when light is needed for light or dual cured curing time is usually 10 seconds 4 apply any light cured.