Muhammed B., E., Muhammed A., G., Seham A., H. (2016). EXTENDED-STORAGE IRREVERSIBLE HYDROCOLLOID IMPRESSION MATERIALS. Alexandria Dental Journal, 41(2), 146-149. doi: 10.21608/adjalexu.2016.59269
Muhammed B., E., Muhammed A., G., Seham A., H. (2016). 'EXTENDED-STORAGE IRREVERSIBLE HYDROCOLLOID IMPRESSION MATERIALS', Alexandria Dental Journal, 41(2), pp. 146-149. doi: 10.21608/adjalexu.2016.59269
Muhammed B., E., Muhammed A., G., Seham A., H. EXTENDED-STORAGE IRREVERSIBLE HYDROCOLLOID IMPRESSION MATERIALS. Alexandria Dental Journal, 2016; 41(2): 146-149. doi: 10.21608/adjalexu.2016.59269
Instructor at the removable prosthodontics department, faculty of Dentistry, Alexandria University, Alexandria, Egypt.
Abstract
INTRODUCTION: There are many contingencies, so many dentists do not pour their own impressions immediately which clears the need for extended-storage alginate impression materials. OBJECTIVES: Evaluating and comparing three extended-storage alginate impression materials concerning their dimensional stability. MATERIALS AND METHODS: One hundred and eighty (180) specimens were prepared in accordance with ADA specification No. 18 using three extended-storage alginates; Hydrogum5 (Zhermack), Cavex ColorChange (Cavex) and Blueprint X Crème (Dentsply). Following to ADA specification No. 19 dimensional stability was evaluated directly at six intervals; 0, 24, 48, 72, 96 and 120 hours using 10 specimens/interval /material. Specimens for delayed evaluation, were stored moistened within sealed plastic bags in a dark room at 23 ±1ºc. RESULTS: All impression materials showed initial expansion and ended with a net shrinkage. Cavex ColorChange showed the least dimensional changes. Dimensional changes of Cavex ColorChange, Hydrogum5 and Blueprint Xcrème ranged (0.14 - 0.59, 0.37 - 2.07 and 0.35 - 1.40% respectively). CONCLUSION: While Cavex ColorChange can be stored up to 120 hours without clinically significant dimensional changes, Hydrogum5 and Blueprint Xcrème should be poured immediately for the best results.
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