Hi Jason,

FRP Nd:YAG dentin etching is much different than FRP Er:YAG dentin etching.

Free running pulsed erbiums tend to leave a smear layer behind.

Free running pulsed neodymiums tend to leave a melted and resolidified layer (aka “reactive dentin”) that is much more resistant to decay and microleakage due to increased bond strengths.

Lots of literature describing these results.

Good question.

Bob