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- Title
Polymerization shrinkage kinetics and degree of conversion of resin composites.
- Authors
Tong Xu; Xuan Li; Han Wang; Gang Zheng; Gaigai Yu; Huimin Wang; Song Zhu; Xu, Tong; Li, Xuan; Wang, Han; Zheng, Gang; Yu, Gaigai; Wang, Huimin; Zhu, Song
- Abstract
This study compared shrinkage strain, polymerization shrinkage kinetics, and degree of conversion (DC) of a set of resin composites and investigated their influencing factors. Ten commercial resin composites were assessed, and 5 specimens (n = 5) were developed for material and subjected to light curing using light emitting diode light at 650 mW/cm2 for 40 s. The laser triangulation method was adopted to assess the shrinkage strain, and Fourier transform infrared spectroscopy was used to measure DC. The shrinkage strain was monitored for 5 min in real time and its data were subjected to differential calculations to get the shrinkage strain rate curve with respect to time, obtaining the maximum shrinkage strain rate (Rmax) and gel time. The values of shrinkage strain varied from 1.28% to 2.10%. The Rmax values were between 5.17 μm/s and 21.83 μm/s. Gel time values varied from 3.08 s to 4.32 s. The DC yielded values ranging from 53.62% to 87.01%. The values of polymerization shrinkage and DC were dependent on the composition of materials, including the monomer matrix and filler system. Compared to the micro-filler materials, the nano-filler resin composites had higher values of DC. Some resin composites are suitable for clinical applications because of their superior polymerization shrinkage properties and DC.
- Subjects
DENTAL resins; DENTAL materials; PHYSIOLOGIC strain; DYNAMICS; MATERIALS testing; SURFACE properties; INFRARED spectroscopy
- Publication
Journal of Oral Science, 2020, Vol 62, Issue 3, p275
- ISSN
1343-4934
- Publication type
journal article
- DOI
10.2334/josnusd.19-0157