Abstract
Alginate impression materials as elastic impression materials, having preferable manipulability and comparatively preferable elasticity, are clinically prevalent.There are 2 kinds of them:powder type and paste type.The powder type is more widely used, for comparatively homogeneous mixing compound is obtainable and it easily be measured.On the other hand, the paste type, as it is used with dental plaster mixed, is hard to form homogeneous mixing compound, and the dental plaster powder remaining in alginate gel, preferable physical properties can hardly be obtained.The author, in order to improve the defect of the paste type, tries to prepare paste-paste type alginate impression material by making the dental plaster powder pasted.That is, to make the plaster powder pasted, the author selects sorbitan trioreate(ST), polyoxyethylene sorbitan trioreate(PST)and propylene glycol(PG)as paste agents, prepares experimental alginate impression materials changing the mixing ratio of paste agent and dental plaster and that of base material and hardener and examines their physical properties.
