No further work can be carried out because fine details can no longer be accurately reproduced after setting begins. The gypsum begins to crystallize at the end of the working stage. Pouring the impression should be completed within the working time. The impression should be poured immediately after mixing. How do you store alginate? Should you pour the gypsum immediately after taking impression? Use sealed containers in dental offices especially. Stone or plaster bins: place only the amount used in a day and reload for the next day’s use. Keep the plastic liner closed and wrapped tightly when not in use or transfer bulk material to smaller, sealed lid containers. If an alginate impression is stored in water or in a soaked paper towel, the alginate will absorb the additional water and expand. What happens if an alginate impression is stored in water? If for some reason they cannot be prepared directly, they should be stored in 100 relative humidity in a plastic bag or wrapped in a damp (but not wringing-wet) paper towel. How do you preserve alginate impressions?įor maximum accuracy alginate impressions should be poured up in the model material as soon as possible. Bottom line: The casts should be removed, ideally, between 1-3 hours after pour-up. However, if you allow the impression material to remain in contact with the stone for more than a few hours, it becomes chalky, and as the alginate dries out, it becomes stiff and will tend to break off teeth as well. What happens if you store the impression for after an hour before you pour the cast stone? How is a poured hydrocolloid impression stored?īecause it is not always possible to pour the impression immediately in routine clinical practice, all irreversible hydrocolloid materials studied could be stored in a zip-lock plastic bag for upto 1 h without any significant distortion. How quickly and why should an irreversible hydrocolloid impression be poured?Ģ, 12, 23, 24, 25Other researchers have stated that in order to achieve the best results, dental irreversible hydrocolloid impressions should be poured after 10 minutes to avoid distortion from initial expansion and elastic deformation, but prior to 1 hour to avoid distortion from irreversible hydrocolloid contraction … Conclusions: It can be concluded that the alginate impressions can be stored for up to 5 days. The results showed significant differences between the alginates however, no differences in dimensional accuracy were found among the different storage times of alginate impression. How long can alginate impressions be stored? 8 What can an irreversible hydrocolloid be used for?.7 When do you use reversible hydrocolloid impression material?.6 What is an irreversible hydrocolloid?.5 Should you pour the gypsum immediately after taking impression?.4 What happens if an alginate impression is stored in water?.3 How do you preserve alginate impressions?.2 How quickly and why should an irreversible hydrocolloid impression be poured?.1 How long can alginate impressions be stored?.
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