[Viscoelastic behavior of alginate impression materials. Part 1. Linear viscoelasticity].

For taking accurate impressions, many material characteristics of the impression materials must be well understood. It is especially important to analyze the viscoelastic behavior of the impression materials. In our study, seven commercial alginate impression materials were used, and their linear viscoelasticity was measured using a creep meter (RE-3305, Yamaden Co.). The measurement condition were : load speed 0.5 mm/sec, sample form ƒÓ 30 mm •~ 40 mm, room