Dental When does a fixed dental prosthesis (FDP), which was cast in one piece, need to be sectioned? A When a cantilever pontic is used. B When the fit cannot be achieved or verified with a one-piece cast. C When single crowns are adjacent to the FDP. D Always, in order to achieve a good fit. 💡 Explanation When does a fixed dental prosthesis (FDP), which was cast in one piece, need to be sectioned? ✓ Correct Answer: B. When the fit cannot be achieved or verified with a one-piece cast.