EXTENDED-STORAGE IRREVERSIBLE HYDROCOLLOID IMPRESSION MATERIALS

Muhammed B., El-Danasory; Muhammed A., Gad; Seham A., Hanafy

doi:10.21608/adjalexu.2016.59269

EXTENDED-STORAGE IRREVERSIBLE HYDROCOLLOID IMPRESSION MATERIALS

Document Type : Original Article

Authors

Instructor at the removable prosthodontics department, faculty of Dentistry, Alexandria University, Alexandria, Egypt.

10.21608/adjalexu.2016.59269

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.

Keywords

Main Subjects

Fixed prosthodontics

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