About 150 to 200 patients of a Tulsa oral surgeon accused of unsanitary practices lined up outside a health clinic Saturday, hoping to discover whether they were exposed to hepatitis or the virus that causes AIDS.

Letters began going out in stages Friday to 7,000 patients who had seen Dr. W. Scott Harrington during the past six years — warning them that poor hygiene at his clinics created a public health emergency. The one-page letter said how and where to seek treatment but couldn’t explain why Harrington’s allegedly unsafe practices went on for so long.

Testing for hepatitis B, hepatitis C and the virus that causes AIDS began at 10 a.m. Saturday, but many arrived early and stood through torrential downpours.

Kari Childress, 38, showed up at the Tulsa Health Department North Regional Health and Wellness Center at 8:30 a.m., mainly because she was nervous.

“I just hope I don’t have anything,” said Childress, who had a tooth extracted at one of Harrington’s two clinics five months ago. “You trust and believe in doctors to follow the rules, and that’s the scariest part.”

Inspectors found a number of problems at the oral surgeon’s clinics in Tulsa and suburban Owasso, according to the state Dentistry Board, which filed a 17-count complaint against Harrington pending an April 19 license revocation hearing. According to the complaint, needles were reinserted into drug vials after being used on patients, expired drugs were found in a medicine cabinet and dental assistants administered sedatives to patients, rather than the doctor.

An instrument set reserved for use on patients with infectious diseases was rusty, preventing its effective sterilization, and the office autoclave — a pressurized cleaner — was used improperly and hadn’t been certified as effective in at least six years, according to the complaint.

Dr. Matt Messina, a practicing dentist in Cleveland and a consumer adviser for the American Dental Association, said creating a safe and hygienic environment is “one of the fundamental requirements” before any dental procedure can be performed.

“It’s not hard. It just takes effort,” he said.

Weekly autoclave testing can be performed for less than $400 annually, according to the website of the Autoclave Testing Services of Pearl River, New York.

Autoclaves — devices which use high-pressure steam to sterilize medical equipment, typically can be purchased for $1,000 to $8,000, depending on their size and features. An average dental practice can expect to pay more than $40,000 a year in equipment, tools and supplies alone, according to several dental organizations.

Attempts to reach Harrington have been unsuccessful. No one answered the door Thursday at his home, which property records show is worth more than $1 million. His practice sits a few miles away in a tony section of the city amid plastic surgeon offices, bistros and stores like Saks Fifth Avenue, and has a fair-market value of around $851,000.

His malpractice lawyer, Jim Secrest II, did not respond to phone messages on Thursday or Friday. A message at Harrington’s Tulsa office said it was closed and an answering service referred callers to the Tulsa Health Department.

State epidemiologist Kristy Bradley and Tulsa Health Department Director Bruce Dart sent letters Friday to all 7,000 patients they found in Harrington’s records, urging them to be screened. More patients may be at risk, but Harrington’s files go back only to 2007.