title: Setting properties of alginate impression materials in dynamic viscoelasticity.
abstract: The viscoelastic properties of three alginate impression materials were investigated. A landmark of working time was calculated using a raw phase-time curve. A landmark of setting time was calculated from an inflection point of the divided difference of the first order in the share modulus-time curve. As a result, the working time was common at the point of delta = 45 degrees in variable frequencies. The mean value was obtained with less deviation. The setting times obtained were similar for variable frequencies. The mean values showed a distinct difference for each impression material.
authors.affiliation: Department of Prosthetic Dentistry, Hiroshima University School of Dentistry, Japan.
authors.forename: N
authors.initials: N
authors.lastname: Shigeto
authors.forename: Y
authors.initials: Y
authors.lastname: Yamada
authors.forename: H
authors.initials: H
authors.lastname: Iwanaga
authors.forename: A
authors.initials: A
authors.lastname: Subianto
authors.forename: T
authors.initials: T
authors.lastname: Hamada
mesh_terms: D000464:Alginates / Q000737:chemistry*; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D003760:Dental Impression Materials / Q000737:chemistry*; D004548:Elasticity; D016015:Logistic Models; D008422:Materials Testing; D012212:Rheology; D013997:Time Factors; D014783:Viscosity
chemical_list: D000464:Alginates; D003760:Dental Impression Materials; C092299:Coe Alginate