1. 50 percentile is the cut-off for general category. Percentile means if 100 people write the exam the top 50 are considered to have qualified. So even if the score is like 10 marks for the 50 th ranked person they are considered to have qualified.
2. For AIQ seats the cut-offs for BDS will be higher than for State quota seats. Here depending on the competition and total number of seats available for the MBBS/BDS streams in your state the cut-offs will be different. For instance in Delhi people scoring 600+ may find it difficult to get a seat while in Tamil Nadu those in 400+ also will get MBBS seats
3. For Deemed universities and private colleges the cut-offs are really low(if you qualify in NEET even in 40–30 percentile range also it is quite enough) if you have the money to pay.

Coming to your question, a score between 430-480 can keep u in safe position to secure a seat in Nanded BDS college. But at the end things depend on ur state merit rank.

All the best for your future.