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Polymerization shrinkage stress of four dental resin composites: an in vitro strain-gauge study

Year: 2026
Type: article
Abstract: Commercially available dental resin composites differ in filler characteristics, resin-matrix composition, and handling properties.These formulation differences may influence polymerization shrinkage stress; however, the stress behavior of each material requires direct experimental evaluation.In this study, the polymerization shrinkage stress of four dental resin composites was compared: one flowable resin composite, two injectable resin composites, and one packable resin composite.Ten ring-shaped specimens of each material were fabricated using a three-dimensional printer.A foil strain gauge attached to each mold recorded strain at 1-second intervals for 800 seconds beginning at the initiation of light curing.The strain values were converted to stress using Hooke's law.Group differences were analyzed using the Kruskal-Wallis test, followed by Mann-Whitney U tests.All groups demonstrated an initial transient shift in the negative direction, followed by a progressive increase in polymerization contraction stress toward a plateau, with the rate of stress development gradually decreasing.At 800 seconds, Filtek Z250 (Z250) showed the lowest mean stress (0.90±0.13 MPa), followed by Filtek Supreme Flowable Restorative (FSF), G-aenial Universal Injectable (GUI), and EsFlow Plus Injectable (EFP).GUI-Z250, FSF-EFP, and FSF-Z250 showed significant differences (p<0.05),whereas other pairwise comparisons were not statistically significant.Within the limitations of this in vitro study, the findings are restricted to the polymerization contraction stress measured for the four tested materials and the comparative differences observed under the experimental conditions.
DOI: 10.21851/obr.26.018
Language: English
Field: Dentistry
Open Access status: diamond
OpenAlex ID: W7220695039
FWCI:
Cites: 16
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Related to: 10