title: Thermal and pH changes, and dimensional stability in irreversible hydrocolloid impression material during setting.
abstract: Present study the relation between pH, thermal changes and dimensional stability during setting of irreversible hydrocolloid impression materials was investigated. Ten specimens of each product were prepared for different measurements: Thermal, pH changes and dimensional stability (mass and linear). Thermal and pH readings for 20 min and dimensional measurements for a 2 hr period were taken after mixing. It was observed that pH and thermal values changed in relation to different materials, while they did not change with the time according to variance analysis results. On the other hand, dimensional stability showed significant differences with time in all tested impression materials. A continuous pH change was observed with the time of gelation in all irreversible hydrocolloid impression materials tested. Dimensional stability also showed significant differences with time in all impression material and as a result hydrocolloids with a high pH showed better dimensional stability than those with a low pH.
authors.affiliation: Atatürk Universitesi, Diş Hekimliği Fakültesi, Protetik Diş Tedavisi Anabilim Dali, Erzurum, Turkey.
authors.forename: Funda
authors.initials: F
authors.lastname: Bayindir
authors.forename: Nuran
authors.initials: N
authors.lastname: Yanikoğlu
authors.forename: Zeynep
authors.initials: Z
authors.lastname: Duymuş
mesh_terms: D000464:Alginates / Q000737:chemistry*; D000704:Analysis of Variance; D003102:Colloids / Q000737:chemistry*; D003760:Dental Impression Materials / Q000737:chemistry*; D005782:Gels; D006801:Humans; D006863:Hydrogen-Ion Concentration; D016014:Linear Models; D008422:Materials Testing; D011208:Powders; D013223:Statistics as Topic; D013499:Surface Properties; D013696:Temperature; D013997:Time Factors; D014867:Water / Q000737:chemistry
chemical_list: D000464:Alginates; D003102:Colloids; D003760:Dental Impression Materials; D005782:Gels; D011208:Powders; D014867:Water