Some stone may run out the back of tray on to vibrator. Once all teeth are filled you can start to add stone more rapidly to impression without worrying about voids. Turn on the vibrator place the mixing bowl on a vibrator to remove any remaining bubbles, then place a small amount of stone at the corner of the tray with the spatula, watch it flow into the teeth making sure there are no bubbles in the mix. Keep adding water and mixing until stone is creamy like cake batter and holds its own weight on the spatula. Put large scoop of stone in a green mixing bowl and add water get powder wet start mixing slowly so powder does not get all over. It is a judgment call how much stone and water to use for pouring a model. Cut excess impression material from the back areas of the tray, leaving at least 2-3mm of material behind the last tooth on each side of the arch. There is also a surfactant spray that does the same.Ĭheck the impressions for distortions. If needed run impression under water shake off excess this reduces surface tension and allows stone to flow over impression much easier. The impressions should be slightly moist. Unwrap paper towel from alginate impression.ĭisinfect before pouring either with a spray or immersion in solution. It is the only way to make a cast or ‘positive’ model of the patient’s dentition out of the alginate dental impression or ‘negative’ mould. Pouring a model in dental stone is a vital component of fabricating an accurate, well-fitting dental appliance. They can also be used for the fabrication of appliances like whitening trays, mouthguards and more. It can be used for studying purposes to determine the patients course of treatment. Pouring a dental model after taking an impresson.Ī dental model is used in dentistry so the dentist can have an exact replica of the patient’s teeth, gingiva, and surrounding tissues in the mouth.
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