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http://dx.doi.org/10.5933/JKAPD.2019.46.1.1

Degree of Conversion and Polymerization Shrinkage of Low and High Viscosity Bulk-Fill Giomer-based and Resin-based composites  

Kim, Heera (Department of Pediatric Dentistry, School of Dentistry, Kyungpook National University)
Lee, Jaesik (Department of Pediatric Dentistry, School of Dentistry, Kyungpook National University)
Kim, Hyunjung (Department of Pediatric Dentistry, School of Dentistry, Kyungpook National University)
Kwon, Taeyub (Department of Dental Biomaterials, School of Dentistry, Kyungpook National University)
Nam, Soonhyeun (Department of Pediatric Dentistry, School of Dentistry, Kyungpook National University)
Publication Information
Journal of the korean academy of Pediatric Dentistry / v.46, no.1, 2019 , pp. 1-9 More about this Journal
Abstract
The aim of this study was to compare the degree of conversion and polymerization shrinkage of low and high viscosity bulk-fill giomer-based and resin-based composites. Two bulk-fill giomer (Beautifil Bulk Restorative (BBR), Beautifil Bulk Flowable (BBF)), two bulk-fill (Tetric N-Ceram Bulk-fill (TBF), SureFil SDR flow (SDR)) and two conventional resin composites (Tetric N-Ceram (TN), Tetric N-flow (TF)) were selected for this study. The degree of conversion was measured by using Fourier transform infrared spectroscopy. Polymerization shrinkage was measured with the linometer. For all depth, BBR had the lowest degree of conversion and SDR had the highest. At 4 mm, the degree of conversion of low and high viscosity bulk-fill giomer resin composites was lower than that of bulk-fill resin composites (p < 0.05). At the depth between 2 mm and 4 mm, there were significant difference with TBF, TN and TF (p < 0.05), while no significant difference in the degree of conversion was measured for BBR, BBF and SDR. Polymerization shrinkage of six resin composites decreased in the following order: TF > SDR > BBF > TBF > TN and BBR (p < 0.05). Polymerization shrinkage of bulk-fill giomer resin composites was lower than that of bulk-fill resin composites (p < 0.05). From this study, it is found that the bulk-fill giomer resin composites and TBF were not sufficiently cured in 4 mm depth. The degree of conversion of low and high viscosity bulk-fill giomer resin composites was significantly lower than bulk-fill resin composites in both 2 mm and 4 mm depths. Therefore, such features of bulk-fill giomer resin composites should be carefully considered in clinical application.
Keywords
Bulk-fill giomer; Bulk-fill; Degree of conversion; Polymerization shrinkage;
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Times Cited By KSCI : 2  (Citation Analysis)
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