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Article
Measurement of water sorption of five different composite resin materials

Author: Waleed M. Khalil وليد خليل
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2005 Volume: 17 Issue: 3 Pages: 37-41
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: Water sorption may affect composite resin materials by reducing their mechanical properties and wear resistance .The aim of this study is to measure the water sorption of five different composite resin materials, for different time intervals.Materials and methods: A stainless steel mold of 4 mm width, 8 mm length and 4 mm depth was constructed to form composite blocks. Seven blocks were made of each test resin composite material. All specimens were placed in a silica-gel desiccator for 48 hours. The samples were then weighed thrice using calibrated electronic microbalance, the average reading was recorded to the nearest 0.0001g. The specimens were kept in individual containers in deionized distilled water at 37 ºC.All specimens were periodically weighed. The weight measurements were taken at 2, 8, 14, 28,42,56,70,100,150 and 240 days intervals.Results: The statistical analysis of the results showed that all composite resin specimens continued to gain weight for a period of 28 days. After that period, the weight gain continued, although at a reduced rate. The changes after the 28 days period were small for the Herculite XRV, Tetric ceram and Tetric composite resins, and greater for the Filtek P60 and Composan LCM composite resins.Conclusion: In this study water absorption increased steadily for all materials. The percentage weight change showed a tendency to increase with the time of water storage. This study concludes that over a period of 8 months, the differences in water sorption capacity of the five composite resin materials are related to the differences in the amount of filler loading in the composite resin matrix. With one exception, the composite resin materials with the largest quantity of fillers had the least water sorption capacity after eight months of storage in water


Article
Water sorption of three types of composite resins

Authors: Dr. Samar Abdul Hamed Yasin. B.D.S, M.Sc د. سمر عبد الحميد --- Dr. Linz Ali Shalan. B.D.S, M.Sc.. د. لنز علي
Journal: MUSTANSIRIA DENTAL JOURNAL مجلة المستنصرية لطب الاسنان ISSN: 18138500 Year: 2011 Volume: 8 Issue: 3 Pages: 242-247
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

Silorane low shrink composite resin material introduced with a non-methacrylateresin matrix to realize a fundamental improvement in cure shrinkage, clinical andphysical properties. The aim of this study is to measure the water sorption of threetype of composite material: Filtek P90, Filtek P60, IPS Empress composites afterimmersion in deionized distilled water as a function of time.Thirty disk shape plastic molds (4 mm diameter and 2mm thickness) wereconstructed to form composite blocks. Teen blocks were made from Filtek P 90(Silorane) GI, Filtek P 60 (packable) GII and IPS Empress (Nanohybrid) GIII. Allspecimens were placed in a silica-gel desiccator for 48 hours. The samples were thenweighed three times using calibrated electronic microbalance and the average readingwas recorded to the nearest 0. 0001g then specimens were kept in individualcontainers in deionized distilled water at 37 oC. All specimens were periodicallyweighed. The weight measurements were taken from the second day after incubationand continue as one measurement every week for 6 weeks. Data were subjected tostatistical analysis using descriptive analysis, ANOVA and least significantdifferences LSD test.Statistical analysis of the results showed that all the specimens continued to gainweight for a period of 4 weeks. After that period the weight gain continued, althoughat reduced rate. Filtek P90 (Silorane) GI has highly significant less water sorptionvalue ( p < 0.01) than the other groups after 6 weeks, while there was no significantdifferences ( p > 0.٠٥) between IPS Empress (Nanohybrid ) GIII and Filtek P60 (Packable ) GII in their water sorption value with higher value for GIII.Silorane which based on siloxane and oxirane resin matrix has less value after 6weeks followed by Packable composite while IPS Empress has higher value for watersorption. This study concluded that the differences in water sorption capacity of thethree composite resin materials are related to the differences in the type of resinmatrix, the amount of filler loading and filler particle size.

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