9/25/2023 0 Comments Perfect alginate impressionVibrate the mix: Place the rubber bowl on a vibrator set to medium.Avoid vigorous whipping as this can introduce unwanted air bubbles. The mix should hold its weight on the spatula and not be runny. The consistency should be like thick cake batter or creamy peanut butter. Spatulate thoroughly, pressing the material against the sides of the bowl until all the powder is absorbed. Stir and spatulate: Begin stirring with a wide lab spatula.Measure the powder: Slowly add it to the water, allowing all the particles to become wet and avoid air trapping.Too much water prolongs set time and reduces strength while too little water makes the mix too thick and decreases the flowability. Cool water decreases set time for the stone while warmer water speeds it up. Measure the water: Add the water to a clean rubber mixing bowl.Always follow manufacturer’s directions and use the measuring instruments that come with the product.įollow these steps to ensure a reliable mix. Techniques for mixing stone are critical for an acceptable outcome. If you cannot immediately pour the model, wrap the impression in a damp paper towel and place it in a plastic bag to retain moisture. This is necessary because alginate materials can start to distort after 5 minutes due to dimensional change. When working with alginate impressions, the model should be poured within minutes of when the impression is completed. Likewise, storing the impression under water also causes distortion. If possible, pour the model within 15 minutes of taking the impression to avoid distortion caused by desiccation. This facilitates pouring and trimming the cast. Shake out excess water and apply a gentle spray of compressed air.įor mandibular impressions, add a small amount of impression material to the lingual area to form an artificial floor of the mouth. Disinfect the impression then rinse it under cool running water to remove residual disinfecting liquid and debris.
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