Mrs. Thoa Chau Ngyuen from the Cantho University in Vietnam, has from 2006 been a PhD student at the Department of Oral Function and Prosthetic Dentistry in Nijmegen. On November 24 2010 she has succesfully defended her doctoral thesis to obtain the degree of doctor from Radboud University Nijmegen. The title of her thesis is 'An epidemiological study on oral fucntion in Southern Vietnam'. The promotor is Prof. dr. N.H.J. Creugers.