![]() ![]() Cervino, G., Fiorillo, L., Herford, A.This lower number of air bubbles in the mixture reduces the risk of having macroscopic defects in the impression and consequently macroscopic defects in the gypsum model, and therefore ultimately favours better prosthesis precision. Mechanical, and particularly automatic, mixing significantly reduces the number of air bubbles in the mixture (2). Once the centrifuge phase has finished, use the spatula to place the material in the impression tray. ![]() Open the hatch on the machine, set the times, place the measured powder in the container, add the water, mix it quickly into the powder, close the container, place it in the machine, close the hatch and start the centrifuge. Higher temperatures will make the reaction faster, whereas cooler ones will make it slower.Īs regards mixing and the measures that favour an optimum result, a number of mixing techniques can be used:Ĭonsult the Zhermack dental alginates catalogĪutomatic mixing is the most recent evolution for alginate mixing. (2)īefore measuring out the product, shake the box containing the alginate powder to favour dispersion and make the mixture more homogeneous.ĭistilled water should be used to be sure that it does not contain any minerals that could affect the gelation reaction and it should be used at the temperature indicated by the manufacturer. Different power-to-water ratios do not guarantee the maintenance of the chemical and physical characteristics declared by the manufacturer, making the impression result unpredictable, which could lead to sub-optimum clinical results. Measuring is a fundamental step: the powder and water must be mixed in the ratio indicated on the pack by the manufacturer. However, all these advantages depend on the correct performance of the phases regarding the preparation of powder/liquid impressions, namely: The advantages of alginate impressions is the low cost, patient tolerability, the ease and rapidity of the procedure, the simplicity of the instrumentation required and precision (1). Alginate impressions are a basic procedure that can be performed by all dentists, from prosthodontists to orthodontists. ![]()
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