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The effect of pouring time on the dimensional accuracy of casts made from different irreversible hydrocolloid impression materials
AIMS AND OBJECTIVES: To determine the time dependent accuracy of casts made from three different irreversible hydrocolloids. MATERIALS AND METHODS: The effect of delayed pouring on the accuracy of three different irreversible hydrocolloid impression materials – Regular set CA 37(Cavex, The Netherlan...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Medknow Publications & Media Pvt Ltd
2013
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3793551/ https://www.ncbi.nlm.nih.gov/pubmed/24124296 http://dx.doi.org/10.4103/0976-237X.118368 |
Sumario: | AIMS AND OBJECTIVES: To determine the time dependent accuracy of casts made from three different irreversible hydrocolloids. MATERIALS AND METHODS: The effect of delayed pouring on the accuracy of three different irreversible hydrocolloid impression materials – Regular set CA 37(Cavex, The Netherlands), regular set chromatic (Jeltrate, Dentsply), and fast set (Hydrogum soft, Zhermack Clinical) was investigated. A brass master die that contained two identical posts simulating two complete crown-tapered abutment preparations with reference grooves served as a standardized master model. A total of 120 impressions were made using specially prepared stock-perforated brass tray with 40 impressions of each material. The impressions were further sub-grouped according to four different storage time intervals: 0 min (immediately), 12 min, 30 min, and 1 h. The impressions were stored at room temperature in a zip-lock plastic bag. Interabutment and intraabutment distances were measured in the recovered stone dies (Type IV, Kalrock) using a profile projector with an accuracy of 0.001 mm. The data so obtained was analyzed statistically. RESULTS: Results of this study showed no statistically significant differences in the accuracy of casts obtained at different time intervals. CONCLUSION: Because 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. |
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