I have completed my b.d.s. in march2012 and i want to do my pg in destistry in usa colleges. which one is best and what are the requirements

I have completed my b.d.s. in 2012 from ntr health university after completing 10+2 course. i may not get a seat in p.g. course of dental surgery. so i want to continue my study in dentistry in any one best medical university in u.s.a. I want to what to do and how to go ahead. pl tell me.