While I would agree with you that it was wrong for your parents to circ you without your knowledge and consent, I am also certain that they thought they were doing what they believe was the right thing to do. So try to simmer your anger a bit with that understanding, especially if you'd like them to understand your position.
Sometimes you have to give a little ground in order to gain some.
Ask them to at the very least have a rational discussion about it rather than the "NO! end of discussion" approach you imply they are now using.
So... instead of getting into any heated arguments with them over the use of the TLC or DTR, ask them to explain to you WHY and HOW they are "too dangerous" and on what evidence are they basing this claim upon.
Then you can explain to them how it works and present evidence of it's successful use.
You could also ask them to take you to a doctor to get his/her opinion.
However, if in the end they still refuse to let you explore this option... you'll just have to wait until you're 18, then you wont need anyone's consent if you still wish to do it.
If you were my son and wanted to restore... I would not be against it, but I would try to convince you to wait until you were 18ish just to make sure that the restoration process doesn't interfere with your normal growth in that area.