Effect of Astringent Products on Accuracy of Polyether Impressions and Plaster Casts

Maischberger, Christian; Stawarczyk, Bogna und Liebermann, Anja (2019): Effect of Astringent Products on Accuracy of Polyether Impressions and Plaster Casts. In: International Journal of Prosthodontics, Bd. 32, Nr. 3, PMID 31034546: S. 281-288

Abstract

Purpose: To investigate whether hemostatic agents have any detrimental effects on polyether impressions and plaster casts after a clinically viable cleaning protocol. Materials and Methods: A total of 60 human molar teeth were manually standardized, prepared, and subdivided into five groups (G): GO (control/ no contamination);G1 (ViscoStat Clear);G2 (ViscoStat);G3 (Astringedent);and G4 (Astringedent X). Each tooth was contaminated with a hemostatic agent for 3 minutes and cleaned with a 30-second air/water spray. Before and after contamination, an impression was taken and a plaster cast was poured. The impressions and plaster casts of all teeth were scanned using a light scanner. Data were matched using a three-dimensional analysis software that displayed color-coded maps. Means of the maximum positive/negative values and of the mean deviations in each group were calculated and compared. All color-coded maps were interpreted descriptively using the program's color scale, and all impressions and plaster casts were microscopically evaluated. Results: Values of mean deviations throughout all matched scans showed maximum values ranging from -30.1 to +17.5 mu m. None of the groups showed significantly different deviation values or patterns when compared to each other. Impressions showed a thin, discontinuous coating for G2, G3, and G4;no changes were found for plaster casts. Conclusion: Presented deviations showed the same values and distribution patterns within all groups. A cleaning protocol of 30 seconds of air/water spray is sufficient to remove hemostatic agents, preventing effects to polyether impressions and plaster casts. However, ferric sulfate-containing hemostatic agents left discontinuous coatings on impression surfaces.

• Dokumententyp: Zeitschriftenartikel
• Fakultät: Medizin
• Themengebiete: 600 Technik, Medizin, angewandte Wissenschaften > 610 Medizin und Gesundheit
• ISSN: 0893-2174
• Sprache: Englisch