[In memoriam Vilmos Vajna: to commemorate his 155th birthday].

Vilmos Vajna was born in Transylvania. His medical education was completed at Franz Joseph University of Arts and Sciences in Kolozsvár. He studied dental sciences in Vienna and Pest. After returning to Kolozsvár he obtained his habilitation ("venia legendi") and then lectured dentistry at this university. After finishing his academic carrier he moved to Budapest in 1895. While he practiced dentistry in his private office he made several technical innovations, constructed new instruments, and invented new technologies. He was an active member of the public life of the dental community.