So an overbite is usually a condition of the jaw when it isn't aligned, so the top jaw 'juts out' further than the bottom jaw considerably. A state of the art overbite sounds interesting, but without more text I can't guess the context - do you have any more?

I agree with Tutor Zowee as to what an overbite is. No idea what state-of-the-art overbite might been. You had your teeth redone for thousands of dollars using the newest technology and they messed up and now you have a state-of-the-art overbite.