Ok… well thats assault? I would be devastated if a ‘friend’ did this to me, and i would feel violated if it was so agressive you bf had to pull him off. I really hope your ok.
In regards to your implant, i doubt he has done any physical damage. I was reading that the testing of the implants integrity is vigorous, and the equivalant weight of a heavy vehicle is placed on the implant to ensure it doesn’t rupture, so i imagine a human bite shouldn’t cause any damage to the implant. The indentation maybe damage to your natural tissure where this moron bit you which will heal in time. I hope you’ve struck this animal of yoyr xmas card list x