<prompt> A major difference between total-etch and selfetching primer dentin bonding systems include all of the following except ___.The time necessary to apply the materials.The amount of smear layer removed.The bond strengths to enamel.The need for wet bonding.  <response>: Self-etch dentin bonding systems differ from total-etch dentin bonding systems by removing less of the smear layer they use a less potent acid, creating a weaker bond to enamel especially nonprepared enamel, and not requiring wet bonding that may be necessary for some of the total-etch systems. Even though fewer actual materials may be needed with some of the self-etch systems, they need to be applied in multiple coats and thus the time necessary to apply the materials is similar for both systems. 