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VOLUME 18 , ISSUE 10 ( October, 2017 ) > List of Articles

RESEARCH ARTICLE

Assessment of Influence of Contact Time between Alginate and Type III Dental Stone on Properties of Cast Model: An in vitro Study

Shruti Dev, Mirna Garhnayak, Angurbala Dhal, Lokanath Garhnayak, Aswini K Kar

Citation Information : Dev S, Garhnayak M, Dhal A, Garhnayak L, Kar AK. Assessment of Influence of Contact Time between Alginate and Type III Dental Stone on Properties of Cast Model: An in vitro Study. J Contemp Dent Pract 2017; 18 (10):911-914.

DOI: 10.5005/jp-journals-10024-2148

Published Online: 01-10-2017

Copyright Statement:  Copyright © 2017; Jaypee Brothers Medical Publishers (P) Ltd.


Abstract

Introduction

Alginate is a versatile, irreversible hydrocolloid impression material, which is cost-effective and forms an essential component in dental practice. For elevating the hardness of the cast models, hardeners are combined with stone. Hence, we planned the present study to evaluate the impact of altering the time of contact between alginate and stone after various interim periods.

Materials and methods

The present study included the assessment of impact of time of contact between alginate and stone by the construction of 90 casts using a cylinder model. Two bisecting lines were marked and were named as y and y'. These lines were used for testing the dimensional stability. Using chemically cured acrylic resin, the construction of ten special trays was done. All the impression casts were randomly divided into two study groups, with 45 casts in each group.group I: control group, casts were removed after 60 minutes; group II: study group, casts were removed after 9 hours. A digital caliper was used for measuring the dimensional stability of the cast. All the data were collected and analyzed.

Results

In the specimens of the control group (group I) and the study group (group II), the mean dimensions from y to y' were found to be 17.54 and 17.95 respectively. The mean reading of hardness in the control group and study group was found to be 0.59 and 0.20 respectively. In groups I and II, the number of specimens showing clarity of two lines (X and X”) was 0 and 5 respectively.

Conclusion

There was no change in the dimensional stability of the dental stone model when the contact time was increased.

Clinical significance

Within certain limits, the contact time between alginate and stone can be altered without significantly altering the properties of the cast.

How to cite this article

Dev S, Kar AK, Garhnayak M, Garhnayak L, Dhal A. Assessment of Influence of Contact Time between Alginate and Type III Dental Stone on Properties of Cast Model: An in vitro Study. J Contemp Dent Pract 2017;18(10):911-914.


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