Prior to that, he practiced in the Centre of Dentistry in the field of oral and maxillofacial surgery at the university hospital. He gained certification as a specialist in endodontics from the German Society of Endodontology and Traumatology in 2009 and a year later as a specialist in oral surgery. Over the last several years, Bürklein has authored numerous national and international articles published in peer-reviewed journals in endodontics, including the International Endodontic Journal, the Journal of Endodontics and ENDO—Endodontic Practice Today.