Dr. Justman joined the faculty in the Department of Family Dentistry as a clinical instructor in 1986 and also taught in the Department of Endodontics. In 1990, he became a clinical assistant professor in Family Dentistry. In 1994, Dr. Justman left the College of Dentistry for endodontic private practice in Cedar Rapids. He rejoined the Department of Endodontics as a full-time clinical associate professor in 2004. He was the predoctoral program director for the Department of Endodontics.
Dr. Justman retired in 2015.
Dr. Justman was the Endodontics junior clerkship director and is responsible for undergraduate clinic and seminar instruction. He also gave postgraduate clinical and didactic instruction, including seminars, orientation, literature reviews and case reviews, as well as procter cases. Dr. Justman provided didactic lecture and laboratory instructions in the preclinical endodontic course. He taught in the Department of Family Dentistry as an endodontic consultant.
Dr. Justman taught in the junior endodontic clinic and was a consultant in the senior Family Dentistry clinic. He also provided postgraduate clinical teaching to endodontic residents.
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Dr. Justman has been a member of Omicron Kappa Upsilon, the Johnson County Dental Society, the University District Dental Society, the American Association of Endodontists (AAE), the Iowa Dental Association, the American Dental Education Association (ADEA), and the American Dental Association. He was the councilor of the Endodontic Section of ADEA. He serves as a District VI director on the AAE Board of Directors. He was also on the Educational Affairs Committee, the Special Committee to Develop Universal Strategic Principles, the Special Committee to Revise the Glossary of Endodontic Terms, and the Special Committee for Professional Staff for the AAE. Dr. Justman was the secretary/treasurer of the Iowa Association of Endodontists. He is a fellow in the American College of Dentists and is the Deputy Regent for the Iowa Section of the International College of Dentists. He was the faculty advisor for the University of Iowa Chapter of Delta Sigma Delta dental fraternity. He was also an editorial reviewer for Journal of Endodontics and the Journal of Dental Education.