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.