Photo-polymerization kinetics of a dental resin at a high temporal resolution

Sullivan, Braden; Kalliecharan, David; Kostylev, Ivan; Earle, Guy; Stansbury, Jeffrey W.; Price, Richard; Labrie, D.

doi:10.1016/j.jmbbm.2021.104884

Cited by 5 publications

(3 citation statements)

References 38 publications

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“…Consequently, this transition enhances light transmission and activation efficiency, resulting in improved monomer reactivity, which is quantified by an increase in DC. Given that the DC is a crucial metric for evaluating the extent of curing and determining the final properties of the composite, 41,42 it mirrors the process of CC stretching during material formation, which is derived from changes in absorption peaks. Therefore, the mechanical properties of the hybrid‐filled samples, as observed in the multi‐scale mechanical tests described above, exhibit enhancements compared to large‐scale mono‐filled samples.…”

Section: Resultsmentioning

confidence: 99%

Effect of hybrid reinforcements on the curing kinetics and mechanical properties of light‐cured polymer composites

Yao,

Wang,

Wang

2024

Polymer Composites

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Light‐cured polymer composites incorporating particle reinforcements have been adopted for a wide range of engineering applications. Nevertheless, micro‐filled composites exhibit insufficient strength despite good abrasion resistance. Conversely, nano‐filled counterparts possess enhanced strength but easily generate particle agglomeration. Hybrid filling has therefore been utilized in previous studies to combine the advantages of different components, but conclusive results have not been obtained. Within this study, the effects of hybrid filling on the strengthening mechanism and curing kinetics of light‐cured polymer composites were investigated by multi‐scale mechanical tests, in‐situ near‐infrared spectroscopy, scanning electron microscope, and finite element simulations. It was found that hybrid filling led to an average increase in Young's modulus by ~3.94%, the hardness by ~5.81%, the tensile strength by ~10.44%, and the degree of conversion by ~2.54% compared to micro‐filling at the same filler content. Besides, hybrid filling showed more reduced particle agglomeration compared to nano‐scale filling. Finite element analysis revealed that hybrid filling effectively enhanced the load‐bearing capacity of the matrix. Overall, the experimental results unveil a mechanism of particle reinforcement that can be extrapolated to various particle‐filled polymers across different length scales. These findings provide a versatile manufacturing technique for composites with heightened mechanical reinforcement and are expected to guide the application in the field of photo‐polymeric materials.Highlights Light‐cured polymer composites incorporating hybrid silica particles were prepared. The strengthening mechanism was investigated by multi‐scale mechanical tests. Hybrid filling could lead to an increase in material strength compared to micro‐filling. Hybrid filling exhibited reduced particle agglomeration in comparison to nano‐filling.

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Section: Resultsmentioning

confidence: 99%

Effect of hybrid reinforcements on the curing kinetics and mechanical properties of light‐cured polymer composites

Yao,

Wang,

Wang

2024

Polymer Composites

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“…Degree of conversion and polymerization shrinkage are positively correlated 28,38) . For the radiant emittance exceeding 1,000 mW/cm 2 , analysis on polymerization kinetics through axial polymerization shrinkage measurement was a promising substitute for measuring degree of conversion using Fourier transform infrared (FTIR) spectroscopy, and transition times at which the maximum degree of conversion and strain rate occurred were similar 39) . In the present study, strong positive correlations were observed between peak times obtained temperature-heat flow, temperature-polymerization shrinkage, and heat flow-polymerization shrinkage measurements (Fig.…”

Section: Discussionmentioning

confidence: 99%

Three methods to measure the photopolymerization kinetics for different radiant emittance and composite type

LEE,

LEE

2024

Dent. Mater. J.

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Photopolymerization kinetics affects the curing time, degree of conversion, polymerization shrinkage, and mechanical properties of composites. The aim of this study was to compare three methods (temperature, heat flow, and polymerization shrinkage) for photopolymerization kinetics measurement of composites. The photopolymerization kinetics of four composites (2 packable and 2 flowable) were measured with an LED light for 20 s (radiant emittance: 2,100 mW/cm 2 ). For the two packable composites, photopolymerization kinetics was measured with varying the radiant emittance and exposure time. For each measurement method, peak times were determined as the time when maximum temperature rise, heat flow, and shrinkage rate occurred, respectively. The photopolymerization kinetics differed among the measurement methods. The photopolymerization kinetics of composites changed as the radiant emittance and composite type varied. In clinical practice and research on the composite restoration, the kinetics should be considered comprehensively with the complementary use of various measurement methods.

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“…Monitoring of the polymerization reaction allows, among others, for quantitative studies of reaction kinetics, tracking molar mass changes and polymer molecular weight distribution, viscosity, degrees of branching, and many other parameters characteristic of polymer systems. [8][9][10] It also enables the optimization of reaction conditions and a critical evaluation of existing hypotheses and kinetic models used to describe polymerization reactions. Traditional off-line monitoring methods have many limitations, including time delay, mainly due to sampling and time-consuming qualitative and quantitative tests, which result in a significant time interval between sampling and obtaining the results of their analysis.…”

Section: Introductionmentioning

confidence: 99%

Review of quantitative and qualitative methods for monitoring photopolymerization reactions

et al. 2023

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Photo-polymerization kinetics of a dental resin at a high temporal resolution

Cited by 5 publications

References 38 publications

Effect of hybrid reinforcements on the curing kinetics and mechanical properties of light‐cured polymer composites

Effect of hybrid reinforcements on the curing kinetics and mechanical properties of light‐cured polymer composites

Three methods to measure the photopolymerization kinetics for different radiant emittance and composite type

Review of quantitative and qualitative methods for monitoring photopolymerization reactions

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