New York state health officials have stopped a nonprofit group from providing free medical care to thousands of patients lacking health insurance during a four-day dental conference that starts Friday. The nonprofit, Remote Area Medical, had raised $3 million and enlisted hundreds of volunteer doctors and other medical workers to offer a range of health services, including dental care, new eyeglasses and other services. The group had planned to treat about 7,000 patients at the New York Sate event. In September, the New York State Department of Health told the volunteer group, founded in 1985, that it could not treat patients at the conference unless it partnered with an established, state-licensed medical organization. Despite last-minute efforts, the partnership could not be arranged in time, and the nonprofit group said it found out this week that the state would not waive the requirement. This was incredibly disappointing and will mean that thousands of patients won't get the care they desperately need," said Stan Brock, the founder of Remote Area Medical. Brock said state health officials told him during negotiations that the free health services his organization provides were not needed. But Brock said there are tens of thousands of New Yorkers, including homeless people, who are in need of free healthcare.