A dental technician who says Charlie Sheen punched her in the chest during an office visit is suing the actor for assault and battery. Margarita Palestino filed the lawsuit Friday in Los Angeles. Her lawsuit accuses Sheen of attacking her during a dental appointment on Sept. 25, including punching her in the chest and grabbing her bra. Sheen’s publicist Jeff Ballard said Sheen had an adverse reaction to the combination of nitrous oxide and pain medication he was taking for a shoulder injury and that Sheen knocked over dental instruments. But other elements of the woman’s story were not true, he said.