Anastassiadou V, Dolopoulou V, Kaloyannides A
Department of Removable Prosthodontics, Faculty of Dentistry, Aristotle University, Thessaloniki, Greece.
Int J Prosthodont. 1995 Nov-Dec;8(6):535-40.
This study investigated the relationship between pH changes and dimensional stability during setting of irreversible hydrocolloid impression materials. Twelve specimens of seven irreversible hydrocolloid materials were used; pH readings for 20 minutes and dimensional (mass and linear) measurements for a 24-hour period were taken after mixing. The study of the curves and the comparison between them in range and in variance, together with the application of the t test, showed that pH changes were strongly related to the linear and mass changes derived from the variety and the chemistry of the included components and their amounts.
