To Evaluate the Effect of Shef life on Depth of Cure of Polyacid-Modified composite - An In Vitro Study

Authors

  • Affan Ahmad Department of Science of Dental Materials, Dr. Ishrat-ulEbad Khan Institute of Oral Health Sciences , Dow University of Health Sciences, Karachi, Pakistan.
  • Syed Yawar Ali Abidi Department of Operative Dentistry, Dr. Ishrat-ul-Ebad Khan Institute of Oral Health Sciences , Dow University of Health Sciences, Karachi, Pakistan.
  • Shahbaz Ahmed Department of Operative Dentistry, Dr. Ishrat-ul-Ebad Khan Institute of Oral Health Sciences , Dow University of Health Sciences, Karachi, Pakistan.

Keywords:

Depth of cure, Shelf life, Polyacid modified composite

Abstract

Objective:

The present study aimed to compare the curing depth of chemically similar Polyacid-modified compositeresins (PAM-C) having different expiry periods.

Methods:

The curing depth of the PAM-C, Dyract Extra (Dentsply, U.K.) was determined for a near expiry and a longexpiry material using a scraping method based on ISO 4049:2000. Samples were light-cured (800 mW/cm at 40 seconds)in plastic mould. Immediately after light-curing the cylinder shaped material was removed from the mould, height ofthe cylinder of cured material was measured by using digital caliper and taken as the curing depth. The means of thecu rin g d epth o f two m a te ria ls were su b je c ted to two sample in d ep e n d e n t t te s t u sin g SPSS.

Results:

The mean value of depth of cure for near expiry PAM-C (Group-A) was 6.389 mm ( sd ± .202 ) and that oflong expiry material PAM-C (Group-B) was 7.087 mm ( sd ± .149 ). The curing depth differed significantly betweenthe materials of the two groups (P<0.001).

Conclusion:

The curing depth greatly varies between the materials. It may be inferred that the curing depth of the twoassigned groups of PAM-Cs depend on the period of expiry of the material.

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Published

2010-08-13

How to Cite

Ahmad, A. ., Yawar Ali Abidi, S. ., & Ahmed, S. . (2010). To Evaluate the Effect of Shef life on Depth of Cure of Polyacid-Modified composite - An In Vitro Study. Journal of the Dow University of Health Sciences (JDUHS), 4(2), 64–67. Retrieved from https://jduhs.jduhs.duhs.edu.pk/index.php/jduhs/article/view/1317

Issue

Vol. 4 No. 2

Section

Original Articles

License

Copyright (c) 2021 Affan Ahmad, Syed Yawar Ali Abidi, Shahbaz Ahmed

Creative Commons License

This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

Articles published in the Journal of Dow University of Health Sciences are distributed under the terms of the Creative Commons Attribution Non-Commercial License https://creativecommons.org/ licenses/by-nc/4.0/. This license permits use, distribution and reproduction in any medium; provided the original work is properly cited and initial publication in this journal.