I recently had some treatment in Gdansk poland at one of the many dentists used by english/german tourists, dental practice seemed very advanced and up to date, only treatment I had was a check up and white filling at £70 which was fine and no trouble since, I believe implants carried out are around £1k which is much cheaper than the uk, I didn't find out the cost of crowns but am sure this is given on the websites of the dentists provided.