In a one-bottle adhesive resin system, what is true regarding the etching procedure?

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They belong to fourth-generation bonding agentsNo need for a separate etching processA distinct etching step remains necessaryThe system includes only a primerThey eliminate the etching step altogether

Explanation

One-bottle adhesive resin systems still require a separate etching step before application, distinguishing them from self-etching adhesives that do not. They are not classified as fourth-generation bonding agents, nor do they contain only primer or eliminate etching entirely.