my neet marks are 539 rank 56606 which top govt dental college can i get

Dear Aspirant
At first congratulations and best wishes for your result . You haven't mentioned your category sk I assume you as an general category candidate

I am afraid to say with this marks your chances to get government colleges are almost negative through All India counselling for 15% seats . You can still try in state counselling for remaining 85% seats . Different state counselling cut offs vary from each other.
For different states it depend upon availability of colleges, student number etc various things . You have not mentioned your state . You must mention that for us to answer precisely. You must go for your respective state's counselling. Thou

chances for you are pretty positive for you in there also for government colleges. However you can get easily many private medical colleges.
You can further check on our link
https://medicine.careers360.com/articles/neet-cut-off-for-government-colleges
predict your chances here

https://medicine.careers360.com/neet-college-predictor?icn=QnA&ici=qna_answe

Best Wishes.