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A new method to measure the polymerization shrinkage kinetics of light cured composites

Cited 34 time in Web of Science Cited 35 time in Scopus
Authors
LEE, I. B.; CHO, B. H.; SON, H. H.; UM, C. M.
Issue Date
2004-01-21
Publisher
Blackwell Publishing
Citation
Journal of Oral Rehabilitation 2004;32:304–314
Keywords
buoyancycompositeskineticsnegative- feedbackpolymerization shrinkageposition sensitive photo detector
Abstract
summary This study was undertaken to develop a new measurement method to determine the initial dynamic volumetric shrinkage of composite resins during polymerization, and to investigate the effect of curing light intensity on the polymerization shrinkage kinetics. The instrument was basically an electromagnetic balance that was constructed with a force transducer using a position sensitive photo detector (PSPD) and a negative feedback servo amplifier. The volumetric change of composites during polymerization was detected continuously as a buoyancy change in distilled water by means of the Archimedes' principle. Using this new instrument, the dynamic patterns of the polymerization shrinkage of seven commercial composite resins were measured. The polymerization shrinkage of the composites was 1·92∼4·05 volume %. The shrinkage of a packable composite was the lowest, and that of a flowable composite was the highest. The maximum rate of polymerization shrinkage increased with increasing light intensity but the peak shrinkage rate time decreased with increasing light intensity. A strong positive relationship was observed between the square root of the light intensity and the maximum shrinkage rate. The shrinkage rate per unit time, dVol%/dt, showed that the instrument can be a valuable research method for investigating the polymerization reaction kinetics. This new shrinkage-measuring instrument has some advantages that it was insensitive to temperature changes and could measure the dynamic volumetric shrinkage in real time without complicated processes. Therefore, it can be used to characterize the shrinkage kinetics in a wide range of commercial and experimental visible-light-cure materials in relation to their composition and chemistry
ISSN
0305-182X
Language
English
URI
http://hdl.handle.net/10371/62228
DOI
https://doi.org/10.1111/j.1365-2842.2004.01414.x
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College of Dentistry/School of Dentistry (치과대학/치의학대학원)Dept. of Dentistry (치의학과)Journal Papers (저널논문_치의학과)
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