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Evolution of Network Structure and Mechanical Properties in Autonomous-Strengthening Dental Adhesive
Sarikaya, Rizacan Song, Linyong Ye, Qiang Misra, Anil Tamerler, Candan Spencer, Paulette
Sarikaya, Rizacan
Song, Linyong
Ye, Qiang
Misra, Anil
Tamerler, Candan
Spencer, Paulette
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Abstract
The inherent degradation property of most dental resins in the mouth leads to the long-term release of degradation by-products at the adhesive/tooth interface. The by-products increase the virulence of cariogenic bacteria, provoking a degradative positive-feedback loop that leads to physicochemical and mechanical failure. Photoinduced free-radical polymerization and sol‒gel reactions have been coupled to produce a novel autonomous-strengthening adhesive with enhanced hydrolytic stability. This paper investigates the effect of network structure on time-dependent mechanical properties in adhesives with and without autonomous strengthening. Stress relaxation was conducted under 0.2% strain for 8 h followed by 40 h recovery in water. The stress‒time relationship is analyzed by nonlinear least-squares data-fitting. The fitted Prony series predicts the sample’s history under monotonic loading. Results showed that the control failed after the first loading‒unloading‒recovery cycle with permanent deformation. While for the experimental sample, the displacement was almost completely recovered and the Young’s modulus increased significantly after the first test cycle. The experimental polymer exhibited higher degree of conversion, lower leachate, and time-dependent stiffening characteristics. The autonomous-strengthening reaction persists in the aqueous environment leading to a network with enhanced resistance to deformation. The results illustrate a rational approach for tuning the viscoelasticity of durable dental adhesives.
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2020-09-12
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MDPI
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Sarikaya_2020.pdf
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Polymers, Dental adhesives, Autonomous strengthening, Stress relaxation, Mechanical property evolution, Prony series
Citation
Sarikaya, R.; Song, L.; Ye, Q.; Misra, A.; Tamerler, C.; Spencer, P. Evolution of Network Structure and Mechanical Properties in Autonomous-Strengthening Dental Adhesive. Polymers 2020, 12, 2076. https://doi.org/10.3390/polym12092076