Margarita Palestino filed suit against Sheen a year ago (Oct14), accusing him of assault, sexual battery and intentional affliction of emotional distress after claiming he became violent while seeking treatment for an abscess.

She alleged the actor ripped off the nitrous oxide mask Palestino had placed over his face and threatened to kill her after grabbing at her left breast and then trying to remove her bra.

In her papers, she alleged her boss told her Sheen was "high on a combination of crack cocaine and alcohol".

Sheen's publicist told People the actor "had a bad reaction" to the gas administered at the dentist's office and denied illegal drugs were involved.

Palestino has now filed a request for dismissal with prejudice, meaning her suit has been dismissed permanently.