The randomized shortened dental arch study (RaSDA): design and protocol oleh Kern Matthias, Jahn Florentine, Heydecke Guido, Hartmann Sinsa, Hannak Wolfgang, Gitt Ingrid, Dressler Paul, Busche Eckhard, Aggstaller Hans, Heinecke Achim, Gerss Joachim, Marré Birgit, Luthardt Ralph G, Mundt Torsten, Pospiech Peter, Stark Helmut, Wöstmann Bernd, Walter Michael H