Title of article :
Effect of short-term water storage on the elastic properties of some dental restorative materials—A resonant ultrasound spectroscopy study
Author/Authors :
Pirjo Pastila، نويسنده , , Lippo V.J. Lassila، نويسنده , , Mikko Jokinen، نويسنده , , Jyrki Vuorinen، نويسنده , , Pekka K. Vallittu، نويسنده , , Tapio M?ntyl?، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2007
Pages :
7
From page :
878
To page :
884
Abstract :
Objectives This study was aimed to determine if short-term water storage would change elastic properties of dental composite materials. Methods Particulate filler composite resin and continuous unidirectional E-glass FRC materials were photopolymerized and additionally post-polymerized by heat for testing elastic properties with the Resonance Ultrasound Spectroscopy method as a function of time in water storage. The test specimens were stored in 37 °C water for up to 30 days. Results About 1% weight increase due to water sorption was observed in both materials with both polymerization methods. Water sorption did not change the resonance frequencies towards lower values, indicating no significant decrease in elastic properties in these materials. Because of high damping of the polymer composite materials leading to wide resonance peaks and low number of the recorded peaks, accurate determination of the elastic properties was not possible. Significance Results suggest that the most likely explanation for the previously observed decrease in bending stiffness of FRC materials is the decreased yield limit of the hydrated polymer matrix. It is important to recognize that water sorption has the effect on mechanical properties of dental composite materials by changing the yield limit of the matrix rather than by changing the elastic properties of the material.
Keywords :
fiber reinforced composites , elastic properties , water sorption
Journal title :
Dental Materials
Serial Year :
2007
Journal title :
Dental Materials
Record number :
506314
Link To Document :
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