Ghungoor is the furthest of the areas listed here, and that changes the calculation honestly. For a routine scaling, the nearest competent clinic is the right answer and nobody should drive twenty minutes for it.
What justifies the distance is specialist work. Prosthodontics — implants, crowns, bridges, dentures, the rebuilding of a mouth rather than the repair of a single tooth — is a three-year postgraduate degree taken after the BDS, and it is Dr. Prasenjit Dey's named specialism. When several teeth have to work as one system, when a denture has never fitted since the day it was made, or when a front tooth has to be matched convincingly to its neighbours, that training is what you are travelling for.
It also means fewer visits. A plan made properly at the start tends to need less correcting later, which matters more from Ghungoor than it does from Ambicapatty.