It really depends if they were just bent a little bit say from hitting the ground then re cutting them possibly just reshaped them. but i would be careful because it takes material off the reg and makes the threads weaker and could cause the bottle to come out of the asa and cause other issues. i would look into a new reg asap
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all you can do is reshape them with a 1/2 nps die. do not make the mistake of running 1/2 npt die.
It really depends on how bad your threads are damaged. You might be able to run it into an old steel asa or an aluminum one depending on the material. Worst come to worst you have to buy a new bonnet or reg.