5Ratnaweera P M, Yoshi da K, Miura H, et al. A clinical evaluation of the agar alginate combined impression:dimensional accuracy of dies by new master crown technique[ J]. J Med Dent Sci,2003, 50(3) :231 - 238.
6Ferracane J L. Materials in dentistry principles and applications [ M]. Lippincoff Williams Wilkins,2001:195.
7Thongthammachat S, Moore B K, Barco M T,et al. Dimensional accuracy of dental casts: influence of tray material, impression material, and time [ J ]. J Prosthodont ,2002, 11 ( 2 ) : 98 - 108.
8Bradna P,Cema D. Impact of water quality on setting of irreversible hydrocolloid impression materials [ J ]. J Prosthet Dent,2006,96 (9) : 443 - d48.
9Bayindir F,Yanikoglu N,Duymus Z. Thermal and pH changes,and dimensional stability in irreversible hydrocolloid impressionmaterial during setting[J]. Dent Mater J,2002,21 (2) :200 - 209.
10Kim K M,Lee J S,Kim K N,et at. Dimensional changes of denta - limpression materials by thermal changes [ J ]. J Biomed Mater Res, 2001,58(3) :217 - 220.
