Post-polymerization reactivity of free radicals trapped in resin-based dental restorative materials by ESR spectroscopy

Amorim, Bruna Cristina; Vicentin, Bruno Luiz Santana; Mauro, Eduardo Di

doi:10.1007/s00289-019-02914-9

Cited by 2 publications

(3 citation statements)

References 27 publications

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“…The simulated ESR spectrum is shown in Figures 3A-D, and the spectroscopic parameters are summarized in Table S5. The RI was a nine-line spectrum, whereas RIII was a five-line spectrum, as previously reported [26,32]. Irrespective of the groups and time points, the RI and RIII ratios were calculated to be approximately 90% and 10%, respectively (Table S5).…”

Section: Electron Spin Resonance Spectroscopysupporting

confidence: 57%

“…In addition, some RIs react with each other, resulting in recombination and/or disproportionation (i.e., termination of the chain reaction) [28]. Furthermore, others are trapped in the polymer matrix due to vitrification [26,28], as was evident in the late phase of polymerization. It should also be noted that the P(+) and P(−) groups showed slightly different patterns of correlation.…”

Section: Discussionmentioning

confidence: 99%

“…To further analyze the methacrylate-derived nine-line ESR spectrum composed of a propagating radical (RI) and an allylic radical (RIII) [25,26], computational spectral simulation followed by a least-square fitting was carried out using the EASYSPIN package 5.2.28 for MATLAB (Mathworks) [27] to determine the spectroscopic parameters, including the g value, hyperfine coupling constant (AIa, AIb, and AIc for RI, and AIIIa and AIIIb for RIII), line width, and ratio of RI and RIII. The chemical structures of RI and RIII determined in previous studies are shown in Figure 1C [25,28].…”

Section: Electron Spin Resonance Spectroscopymentioning

confidence: 99%

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Impact of adhesive primer and light‐curing on polymerization kinetics of self‐adhesive resin cement in association with free radical reaction

Ozaki

Shishido

Nakamura

et al. 2021

European J Oral Sciences

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This study analyzed the impact of adhesive primer and light-curing on the polymerization kinetics of urethane dimethacrylate-based self-adhesive resin cement combined with free radical reaction. Specimens were prepared by mixing the cement paste with or without adhesive primer. Subsequently, specimens were light-cured or set without light-curing. The degree of conversion (DC), Vickers hardness (Hv), and free radical concentrations were repeatedly measured up to 168 h after the curing initiation. Irrespective of the curing procedures, DC, Hv, and free radical concentration rapidly increased during the initial 30 min of curing. The specimens cured with adhesive primer and/or light-curing generally showed higher values of DC, Hv, and radical concentration than those set by chemical curing alone, especially during the initial polymerization phase. Kinetic analysis using a linear mixed model revealed that the adhesive primer had a higher coefficient estimate than light-curing, indicating that the former had a higher impact on the polymerization. Additionally, the adhesive primer alleviated the Hv reduction caused by water and air during the initial polymerization phase, although light-curing hardly prevented the polymerization inhibition. Therefore, we suggest that application of adhesive primer is beneficial to achieve higher degree of conversion and better mechanical properties of self-adhesive resin cements by enhancing free radical reactions.

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Section: Electron Spin Resonance Spectroscopysupporting

confidence: 57%