Stephen Barber, 72, Kirksville, surrendered his dental license in Jefferson City on Thursday. On June 29, a judge denied a request by the Missouri Dental Board to suspend Barber's license until the disciplinary probation violation hearing, which is scheduled for Friday in Jefferson City. Under that ruling, Barber was allowed to continue to practice dentistry until the probation hearing.Barber's dental office in Kirksville was closed Thursday. Barber had been practicing under a probationary license since May 2009, after an investigation revealed controlled substance violations, along with allegations of incompetence and gross negligence and violations of the public trust.Barber awaits sentencing after being convicted of criminal charges. He was found guilty in June of two felony counts of tampering with a witness. He is scheduled to be sentenced in Adair County Circuit Court on August 17. He could receive up to seven years in prison on each count.See previous stories:Barber retains dental license - Wednesday, June 29, 2011A judge has ruled that a convicted dentist can keep his license, for now. Kirksville dentist could lose license - Monday, June 27, 2011An attorney for the Missouri Dental Board has filed a petition in Adair County Circuit Court. Barber denied new trial - Friday, June 24, 2011Judge orders the motion for an extension missed the deadline. Sentencing date set for Barber - Thursday, June 16, 2011Sentencing set for Aug. 17 Kirksville dentist guilty on both counts - Friday, June 03, 2011The jury returned with its verdict after deliberating six-and-a-half hours. Kirksville dentist stands trial - Friday, June 03, 2011Jury gets Barber case Barber trial starts Wednesday - Thursday, June 02, 2011Change of venue denied Barber's trial coming up in June - Friday, April 22, 2011KTVO did an update on the story at the request of our facebook fans.