It can be anytime but the biggest moving time frame will be in 45 days when they find out who is depositing money for a spot and who isnt.... Last year there was a little countdown for this date but it tended to be a couple weeks after because the admissions committee had to meet and go over the applicants again once they found out how many positions they had to fill
Don't sweat it guys, different schools will do differnet things, but 45+ days is a magic number. I myself got in March 31st...One guy in my class got in DURING ORIENTATION, so don't worry too much...and honestly, dental school is so insane, if you have to take a year off, it could be a blessing in disguise.