PMID: 18203496Jan 22, 2008Paper

Influence of irradiation time on volumetric shrinkage and flexural properties of flowable resins

Dental Materials Journal
Satoru UyamaMasashi Miyazaki

Abstract

The purpose of this study was to evaluate the influence of irradiation time on volumetric change and flexural properties of flowable resins. Four commercially available flowable resins were employed. For volumetric shrinkage measurement, resin pastes were inserted into a mold (2 mm in height, 4 mm in diameter) and put into a water-filled dilatometer. This was followed by light irradiation for 10, 20, or 30 seconds at 600 mW/cm2. Volumetric shrinkage of the specimens was then determined from the change in the height of water meniscus, and the percentage volumetric change thereof was calculated. For flexural strength measurement, resin pastes were filled into a stainless steel mold (25 x 2 x 2 mm), and the middle one-third of the specimen was first irradiated. The remaining two-thirds were irradiated under the same irradiation conditions as volumetric shrinkage measurement. After 24-hour storage in 37 degrees C water, three-point flexural tests were performed with a span length of 20 mm at a crosshead speed of 1.0 mm/min. One-way ANOVA followed by Tukey's HSD test were used for statistical analysis. For all materials tested except Estelite Flow Quick, both volumetric shrinkage and flexural strength increased with longer light irr...Continue Reading

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Citations

Jun 15, 2011·Dental Materials : Official Publication of the Academy of Dental Materials·Turki A BakhshYasunori Sumi
May 19, 2017·Journal of Dental Research·J HayashiA Sadr

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