I didn't match into Ortho my first time around, but the following year after doing an AEGD, I got into a non-match program. I actually went to UCSF for dental school, and although my feelings for my alma mater are of a love/hate relationship, I have been told by lots of programs that I went to a great dental school. For my friends who didn't get into ortho the first time around, all my friends did get in the following year. Most applicants forget one BIG thing, and that is you have to be humble with what you have. A lot of the people who didn't match, including myself, let our pride get in the way and believed they were hot stuff. It took me about six months to realize that I screwed up my interview(s) and also my choices weren't the right fit for me because maybe I was not the applicant they were looking for. Remember, you and ONLY YOU have the ability to make yourself a strong applicant.
Even though I had Part I scores, my friends the following year did not, but they had a killer application. Heavily involved in extracurriculars, clubs, research etc.
NOTE: The school you attend is just a facade to get you into the front door. Afterwards, its up to you to seal the deal and potentially match, regardless if you come from a P/NP grading system