You can try for a couple of schools this year if you gpa is good. But beware if you do not get accepted then the schools will target your DAT and my want you to retake. Then next year you will have to submit an new application, and those schools that you applied this year will expect you to retake the DAT's and those schools you didn't apply this year will wonder why you didn't get in and then you will have to mention your DAT's and that might hurt you.
I would apply next year. Unless you have a 3.4+ Gpa then I think you have a solid shot. But remember each year dentistry is getting more and more competitive. An 18 was the average last year and this year. Who knows if that will remain the average next year.
Keep that in your mind. Now you have taken the DAT's I would spend time contacting the schools and showing your interest. You have a complete app almost, the numbers anyways. I hope your gpa is good, cuz you have to have either your DAT or gpa higher than the schools average. having both scores higher is the best.
Good luck to you,
DesiDentist
PS: If you could post your stats, and experiences, majors etc. that would help us posters give you better picture. However, your DAT scores alone will not help us give you better advice other than "it is possible" of course it is possible with a 3.9 gpa, but how about a 2.8? My word of advice to applicants is the following: If your gpa is between 2.7 - 3.0 you should aim for the 20's across, 3.0 - 3.3 aim for 19's, and 3.4 + you should hit 18 and above and you should have no problems.