What is the fine-grained topic of the following text: He is	a Board-certified	Diplomat in the German	Society for Prosthodontics and Biomaterials (DGPro) and a member of	multiple other professional organizations, including the American Academy of Esthetic Dentistry, the European	Academy of Esthetic Dentistry, the International College of Prosthodontists, the American College of Prosthodontists (honorary member), Academy of Osseointegration, and O.K.U. Only return the topic.
Professional affiliations and certifications of a Prosthodontist