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VOLUME 9 , ISSUE 4 ( May, 2008 ) > List of Articles

RESEARCH ARTICLE

Effect of Storage Time on the Accuracy of Casts Made from Different Irreversible Hydrocolloids

Maurizio Sedda, Andrea Casarotto, Aune Raustia, Andrea Borracchini

Citation Information : Sedda M, Casarotto A, Raustia A, Borracchini A. Effect of Storage Time on the Accuracy of Casts Made from Different Irreversible Hydrocolloids. J Contemp Dent Pract 2008; 9 (4):59-66.

DOI: 10.5005/jcdp-9-4-59

License: CC BY-NC 3.0

Published Online: 01-05-2008

Copyright Statement:  Copyright © 2008; Jaypee Brothers Medical Publishers (P) Ltd.


Abstract

Aim

Several new irreversible hydrocolloid formulations have recently become available with claims of an improved dimensional stability by the manufacturers. The aim of this study was to evaluate the accuracy of casts made from alginate impression materials poured immediately and after specific storage periods.

Methods and Materials

Five alginates were tested: CA 37 (Cavex); Jeltrate (Dentsply Caulk); Jeltrate Plus (Dentsply Latin America); Hydrogum 5 (Zhermack); and Alginoplast (Heraeus Kulzer). A master model was mounted on a special device and used to obtain the impressions. These impressions were stored at 23°C and 100% relative humidity, then poured with gypsum immediately, and again after 24, 72 and 120 hours. The casts were measured and the data were analyzed by one way analysis of variance (ANOVA) and Tukey test at p<0.05.

Results

The dimensional stability of the alginate impressions was both material and time dependent (p<0.05). After 24 hours of storage, only Alginoplast and Hydrogum 5 comply with the master model (p>0.05). After 72 and 120 hours, only Hydrogum 5 was dimensionally stable (p>0.05).

Conclusion

The dimensional stability of the alginate impressions is influenced by the selected material and the storage time.

Clinical Significance

Alginate impressions should generally be poured immediately. However, some new types of alginate may have the pouring delayed.

Citation

Sedda M, Casarotto A, Raustia A, Borracchini A. Effect of Storage Time on the Accuracy of Casts Made from Different Irreversible Hydrocolloids. J Contemp Dent Pract 2008 May; (9)4:059-066.


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