The hydrophilic nature of polyether impression material is manifested in carbonyl (CO) and ether (C-O-C) groups, whereas polysulfide material has hydrophilic disulfide (-S-S-) and mercaptan (-S-H) groups. © 2020 by the American College of Prosthodontists. They contain functional groups that chemically attract and interact with water molecules via hydrogen bonding. All impression materials demonstrated acceptable surface detail reproduction with no significant differences between them.ĭimensional accuracy polyether vinyl polyether silicone vinyl polysiloxane. The best surface detail reproduction results were obtained using the Monophase polyether material (90% acceptable impressions), with no significant differences (χ² = 3.86, p = 0.483) observed between the Monophase and the rest impression materials.Īll materials exhibited acceptable dimensional stability, well below the ANSI/ADA specification no.19 standard of ≤0.5% dimensional change. ![]() Accuracy and detail reproduction, setting time, hydrophilicity: when you’re making a dental impression, you need it all. Hydrophilic before, during and after the. The lowest dimensional change was recorded for the Monophase polyether material with a mean percent value of -0.03 ± 0.01% (p < 0.038). Create great impressions for great-fitting restorations. For those who prefer a hand-mix formulation, this medium body polyether material offers high-precision impressions. The highest dimensional change was recorded for the vinyl polysiloxane impression material, with a mean percent value of -0.09 ± 0.02% (p < 0.001). Statistical differences were observed in the mean percent dimensional stability (F = 39, p < 0.001) of the tested impression materials. The data were analyzed using Welch's analysis of variance, Games-Howell Post-Hoc, and the Pearson's chi-square tests (α = 0.05). Dimensional accuracy and surface detail were evaluated 24 hours after making the impressions using a measuring microscope. Impregum impression material has excellent flow properties that allow for precise impressions due to the snap-setting behavior. ![]() Twenty impressions of this die were made for each material. The tensile and shear adhesive bond strengths of two addition cured silicones and a polyether impression material to brass, poly (methylmethacrylate) and visible light-cured tray resin were determined and it was found that VLC resin generated greater adhesion than acrylic resin. ![]() One stainless steel die was fabricated according to the ANSI/ADA specification no.19 criteria. All impression materials were of a medium viscosity. The materials examined were: 3 different polyether impression materials, a vinyl polysiloxane impression material, and a vinyl polyether silicone impression material. To evaluate the dimensional stability and the detail reproduction of five current elastomeric impression materials in vitro. Within the conditions of the study, it seems that moisture does affect the dimensional accuracy of the polyether impression materials.
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