You should have no problem getting interviews to all three schools based on your scores and GPA. Baylor and Houston really look at the DAT science scores more than anything (whick look great), while San Antonio uses a formula (posted on their website) that includes your GPA and AA DAT.
The real problem I see might be your timing. Even though the schools list a fall deadline, you are coming in behind 11-12 weeks of good candidates who applied early and have already interviewed. Round One applicants and possibly the Round Two applicants at this point. This is my second time to apply. The first time I applied I waited until September too and I was told by TMDSAS at that time that my chances of gaining an interview late in the game are slim because there are so many quality applicants that apply early. I didn't get an interview that first time. The schools start with early applicants first, and fill the spots on a first come first serve bases. I don't know if this is completely accurate because I have read post were people have claimed to interview past the 1st round of acceptance letters on Dec 1st and were accepted as late as February (the second round of letters). Here is one such post from last years TMDSAS thread, dated Feb 2nd:
A friend of mine just got an acceptance to SA this week. She interviewed at the beginning of January. When she interviewed they said that they do a review of the candidates and rank them every Monday. At that point you could receive a letter at any time, or it could be months.
Other posts mention as candidates decline spots, these spots become open and people are offered the open spots. So with your scores, the chances could be good that this year you might be interviewed and accepted.
Just a word of advice, be prepared to answer in your interview why you are now choosing Dentistry after getting a Masters. I was asked to explain in my interview why I wanted to enter d-school after a career outside medicine by all my interviewers. I have a friend in a medical field that interviewed and was drilled hardcore about why the change/interest in Dentistry when they already where in a medical field. I guess they really look to make sure you are doing this for the right reasons, to see if you have researched it well, and are not just taking up a seat to later change your mind again
.etc
etc
I dont doubt your motivation, but they might. So be prepared and good luck.