Does it make it easy to get in? A little, most of those interviewers want to make sure you are going to be dedicated and being in the dental field for some time shows that. Although, most of it is how you present yourself, answer the questions and the scores on the prereq's...DAT score, GPA of undergrad, etc. Now once you do make it into dental school and you are already a dental tech, you definitely have an upper hand in the later years of dental school. The first year is just like medical school first year...tons of gross anatomy, hard classes, five exams a day, not all that dental related. It's when you get into D2 (your second year) it becomes more focused on dentistry. Then D3 you actually start working on patients. D4 working on patients and completing school grad requirements while preparing for board exam. Every school is different and i'm using generalities but that's the gist of it. Will being a dental tech already, then going to dental school be easier...heck yeah it will. A lot of dental students struggle with the lab portion of school and it's very time consuming for them (go figure). As a dental tech, you will already know many of the basic terminology and lab fabrication procedures. Big help.
I have a Dental school student in the lab right now (he goes to dental school in August, already accepted),and by the time he goes he will do very well because he is learning and doing everything in our lab (learning the analog and digital workflows). Hope this helps.