Will it get you in, yes. Will it be helpful in dental school...probably not.
Here is my observation in D-school. The students that have a Bio related degree's study less and make better grades. They were exposed to this material before so its easier to pick up. I have a friend with a business degree and he studies a lot. He makes good grades, but man he really studies.
I have a Biology degree and already took bio-chem, anatomy, physiology, histology...etc so it comes easier to me and I have much more free time.
A good thing for you is that engineering is not an easy degree and adcoms know this...so that will be helpful
I think an engineering degree is useful. Dental materials made a lot more sense to me than some of my friends because I already knew all the terminology from materials science classes. Plus engineers (at least at my undergrad) had to put in a lot more time than other majors and so you won't find it strange to be in the preclinic after hours or on a weekend.
Sometimes I wish that I had taken classes like anatomy beforehand though. It is a different way of thinking than I was used to.