2Mondon M, Ziegler C. Changes in water contact angles during the first phase of setting of dental impression materials[J]. Int J Prosthodont, 2003,16 ( 1 ) : 49- 53
3Di Felice R,Scotti R. The influence of the mixing technique on the content of voids in two polyether impression materials[J].Schweiz Monatsschr Zahnmed,2002,112(1) :12-6