Despite having a publication and a poster presentation, I'm going to say it's not that important and here's my anecdotal evidence as to why:
I recently interviewed at a school that proclaimed (according to their website) to be in the top 5 of dental schools for research funding. They asked me about both of my projects but didn't ask for any details and generally didn't seem to really care about it.
That being said, I wouldn't consider it a deal breaker. If you're not into research, I wouldn't bother. Your time will be better spent doing community service which both of the schools I have interviewed at asked me about and wanted details.