Hi Pragati,
First of all congratulations on passing NEET UG exams.
Firstly, to clear your doubts AIIMS doesnt provide BDS courses. It only provides courses for Dental Postgraduation subjects.
Secondly, the cut off rank for the different AIIMS in General Category is given below -
AIIMS Branches 2018 2017
AIIMS Delhi - 49 52
AIIMS Bhopal - 328 596
AIIMS Rishikesh - 480 1382
AIIMS Bhubaneswar - 341 571
AIIMS Jodhpur - 258 753
AIIMS Raipur - 636 1536
AIIMS Patna - 718 1720
AIIMS Mangalagiri - 846 -----
AIIMS Nagpur - 790 -----
These ranks are just trends from the past few years. It majorly depends on individual preferences as well as the category and number of applicants for counselling among other factors.
For furhter information you can refer these links -
https://www.aiimsexams.org/pdf/ALLOTTED%20SEAT-1ST%20ROUND-MBBS-2018-NET.pdf
https://www.aiims.edu/images/pdf/notice/All%20Alotment%20Institute%20Wise.pdf
Best of luck for the counselling ahead and please feel free to ask further doubts.
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