The effect of pH changes at the impression-stone cast interface during setting.
It is of great clinical significance to obtain a cast that reflects the optimal reproducibility of the irreversible hydrocolloid materials. This study investigated whether pH changes that occur during setting (as a single sequence of the chemical reactions that lead to gelation and the formation of the impression) are related to the reproducibility of irreversible hydrocolloids. The results indicated that as the pH range was increased for materials with alkaline pH values, the reproducibility improved. The opposite effect was noticed in materials with acidic pH values. It was also demonstrated that when the pH curve was in the acidic range, it was closer to the neutral pH values, and the reproducibility of the irreversible hydrocolloid was better.
Department of Removable Prosthodontics, Faculty of Dentistry, Aristotle University, Thessaloniki, Greece.
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Anastassiadou
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V
Dolopoulou
A
A
Kaloyannides
D000464:Alginates / Q000737:chemistry; D002133:Calcium Sulfate / Q000737:chemistry; D003760:Dental Impression Materials / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D016014:Linear Models; D008422:Materials Testing; D003765:Models, Dental; D013499:Surface Properties
D000464:Alginates; D003760:Dental Impression Materials; D002133:Calcium Sulfate