Mydent in Carsi Street, are very good dentists and specialise in aesthetic dentistry. They are great with nervous patients and I paid about 275lira for a crown to one of my front teeth that both my usual Turkish dentist and my English dentist had said could not be saved and a false tooth/bridge was needed.
Also above Citlembik (opposite the big cinema) is a great dentist, who is very cheap and her name is Seniz Olecek, she is on the first floor more or less opposite the lift. We use her as a whole for check ups, standard fillings etc., and she is really gentle.