Consistency of alginate impression materials and their evaluation

Abstract

The apparent viscosity of 17 commercially available alginate impression materials was examined using a rheometer. Each material was mixed for 15 s at a temperature of 23 +/- 0.5 degrees C, using a specially designed alginate mixing instrument. The water powder ratio was determined according to the manufacturer's instruction. The mixed alginate paste was immediately transferred to the sample stage of the rheometer or to a commercial perforated metal tray. Over the same time scale adjusted according to the rheometer test, a discrimination test (subjective test) was performed by 16 young dentists (each with more than 4 years experience). The apparent viscosity of all materials rose as a function of time after mixing and most of the material had properties similar to pseudoplastic fluids. The relationship between the results of the subjective test and the experimental values (objective test) with the rheometer was expressed in a quadratic equation. The maximum value of the apparent viscosity derived from this result was 1.52 x 10(3) Pa.s.

Characterization of Morphology and Composition of Inorganic Fillers in Dental Alginates

“…Many factors influence the ultimate success of prostheses, including the setting characteristics [2, 3], the rheological properties after setting [4], and compatibility with dental stones [1, 5]. Alginates are a two-component molding system in which a powdered material is mixed with water.…”

Preservation of the negative image of tooth enamel with dental impression material enhances morphometric measurements of gingival overgrowth

“…Alginates were only slightly more difficult, but were ultimately used at greater dilutions than the manufacturers' recommendations (Inoue et al, 1999). Kromopan mixed into the smoothest paste, Traginate and Tare-free ALG were even a little lumpy after 40 seconds of hand mixing, but all materials made adequate impressions within the allotted setting time without problem.…”

Chemical enhancement of footwear impressions in blood deposited on fabric — Evaluating the use of alginate casting materials followed by chemical enhancement

“…Alginate impression materials are primarily used for dental or bite mark casts because of their ease of use, low cost and good patient acceptability [1]. There are a number of different alginate materials produced by different companies with different characteristics and factors such as setting times.…”

“…There are a number of different alginate materials produced by different companies with different characteristics and factors such as setting times. [1][2][3]. The materials are generally supplied as powders which are mixed with water prior to application and setting.…”