The Sun Domain grants a Cleric that chooses it the following power:
Granted Power: Once per day, you can perform a greater turning against undead in place of a regular turning. The greater turning is like a normal turning except that the undead creatures that would be turned are destroyed instead.
The key word here is "destroyed". There are undead creatures that can come back after they were slain, such as vampires and, most famously, liches. The vampire specifically describes this as a difference between "slaying" a vampire and "destroying" it, with destruction being the permanent solution:
Slaying a Vampire: Reducing a vampire’s hit points to 0 or lower incapacitates it but doesn’t always destroy it (see the note on fast healing). However, certain attacks can slay vampires. Exposing any vampire to direct sunlight disorients it: It can take only a single move action or attack action and is destroyed utterly in the next round if it cannot escape. Similarly, immersing a vampire in running water robs it of one-third of its hit points each round until it is destroyed at the end of the third round of immersion. Driving a wooden stake through a vampire’s heart instantly slays the monster. However, it returns to life if the stake is removed, unless the body is destroyed. A popular tactic is to cut off the creature’s head and fill its mouth with holy wafers (or their equivalent).
Does that mean that an undead creature destroyed with the power granted by the sun domain (or similar effects) are permanently destroyed? Or is this just worded awkwardly, and they can still come back?