In response to the OP's question, I personally think the dental school you attend has the potential to make a HUGE difference in your future.
In Malcolm Gladwell's book "Outliers," he does a good job showing how environment dictates a lot of future success. Innate ability can only get you so far. After that, it is all about opportunities and capitalizing on those opportunities. Bill Gates HAPPENED to attend a high school that had a computer, Bill Joy happened to attend one of the first universities that didn't program with punch cards, etc. While these examples are of extreme outliers, the principles that Gladwell outlines still apply to us 1 sigma or 2 sigma-ers.
Each dental school ( I assume) will roughly teach you the same material. Dental school accreditation is heavily regulated, so what each dental school teaches is pretty similar across the spectrum. That means you have the potential to
learn the same amount at each school. But, each school does not offer you the same opportunities. So, what YOU need to figure out is which school offers you the MOST opportunities, and how much are you willing to PAY for those opportunities.
For example, let's say Dental School A trains you with the new groundbreaking Equipment A, while Dental School B does not (Why not? Can't afford it, does not find it a priority, etc) That difference in opportunity might play a role later on when you're applying to associate positions.
This list can be endless. Does this school teach me to be forward thinking/progressive in my dental approach, or does it teach me to be conservative and stick to what works? Does this school have successful Alumnus that hire from their Alma Mater ? Does this school hold my hand while I'm a student or am I on my own? How does this school prepare me for research? for Business? Etc…
I know dental school is a place where a lot of contacts are made. These contacts can play a role in your future. A fellow peer may be inheriting a private practice, and invites you to partner up. Another contact may develop a new instrument or research, and asks for you to collaborate. Etc..
I know a few practicing dentists that were invited by their dental school buddies into their successful family practice…
Like what is posted earlier, dental school is just a beginning. I agree with the idea that a lot of what you learn comes from your first years as an associate. But, which dental school will set you up to get the BEST associate position?
These are things you need to figure out for yourself. Figure out what your priorities are in this career (specializing, service, research, business, etc) and find the school that caters to that. And again, sometimes cost takes away opportunities. If I am $500K in debt, I may not be able to take advantage of the opportunities the school offers.
Sadly, dental schools do not do a great job of advertising who they really are. I was fortunate enough to interview at several dental schools, and I can honestly say that NO TWO DENTAL SCHOOLS ARE THE SAME. Each school has a culture, a vibe, a feel that is unique to its own. That culture will carry over with you into your practice. I made a thread a while back that talks about what the "vibe" was at each school I interviewed at. Others posted of their views of schools the visited. Read it, find the ones that peak your interest, and apply to those....
http://forums.studentdoctor.net/threads/advice-for-new-applicants.1132380/
To sum it up, wherever you attend dental school, the potential to be a great dentist depends on you. But, attending one over another may give you certain advantages that prove to be very beneficial in your career....
Good Luck!