To Evaluate the effect of Shef life on Depth of Cure of Polyacid-Modified composite - An In Vitro Study | [Journal of Dow University of Health Sciences • 2010]

Author(s):

1. Affan Ahmad: Department of Science of Dental Materials, Dr. Ishrat-ul-Ebad Khan Institute of Oral Health Sciences Dow University of Health Sciences, Karachi, Pakistan.

2. Yawar Ali Abidi: Department of Operative Dentistry, Dr. Ishrat-ul-Ebad Khan Institute of Oral Health Sciences, Dow University of Health Sciences, Karachi,Pakistan

3. Shahbaz Ahmed: Department of Operative Dentistry, Dr. Ishrat-ul-Ebad Khan Institute of Oral Health Sciences, Dow University of Health Sciences, Karachi,Pakistan.

Abstract:

Objective: The present study aimed to compare the curing depth of chemically similar Polyacid-modified composite resins (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 long expiry 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 of the cylinder of cured material was measured by using digital caliper and taken as the curing depth. The means of the cu 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 of long expiry material PAM-C (Group-B) was 7.087 mm ( sd ± .149 ). The curing depth differed significantly between the 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 two assigned groups of PAM-Cs depend on the period of expiry of the material.

Page(s): 64-67

DOI: DOI not available

Published: Journal: Journal of Dow University of Health Sciences, Volume: 4, Issue: 2, Year: 2010

Keywords:

shelflife , Polyacid m odified composite , Depth of cure

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