title: Relationship between pH changes and dimensional stability in irreversible hydrocolloid impression material during setting.
abstract: 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.
authors.affiliation: Department of Removable Prosthodontics, Faculty of Dentistry, Aristotle University, Thessaloniki, Greece.
authors.forename: V
authors.initials: V
authors.lastname: Anastassiadou
authors.forename: V
authors.initials: V
authors.lastname: Dolopoulou
authors.forename: A
authors.initials: A
authors.lastname: Kaloyannides
mesh_terms: D000464:Alginates / Q000737:chemistry*; D003760:Dental Impression Materials / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D008422:Materials Testing; D013997:Time Factors
chemical_list: D000464:Alginates; D003760:Dental Impression Materials