With 345 marks, AIR 3,27,437 and Telangana state rank 10,271 in BCE category, chances for a government dental college are quite low because cutoffs for BDS in government colleges usually stay higher. However, you may still have a good chance of getting into private dental colleges under convenor quota, including Panineeya Institute of Dental Sciences and similar colleges in Telangana. Final allotment will depend on category cutoffs in each round, but your BCE rank gives you a realistic chance in private quota seats.
With a state rank of around 10,271 and a BCE category, you have a fair chance for BDS admission. Government Dental College may be possible, but it's competitive still, don’t lose hope. Panineeya Institute of Dental Sciences is more likely, especially through the convenor quota. Your BCE reservation improves your chances in both colleges. Stay ready for counselling and keep checking KNRUHS updates.