I think studying abroad is a great experience, and I recommend that you do it at some point. In your case, summer 2010 is the best time, and spring 2011 could work. Fall 2010 would be bad
Given your DAT scores and GPA, if you can submit your application this June, I think you'll get some interviews in the fall and at least one acceptance in December. You could then study abroad in the spring. Of course, if there's one dental school that you really want to attend, there's no guarantee that they will interview you in the fall. Many schools interview through the spring. So if possible, submit your application this June, then study abroad until September (when interviews start).