Effect of curing mode on the conversion and IIT-derived mechanical properties of core build-up resin composites

Dimitriadi, Maria; Petropoulou, Aikaterini; Αναγνώστου, Μαρία; Zafiropoulou, Maria; Zinelis, Spiros; Εliades, George

doi:10.1016/j.jmbbm.2021.104757

Cited by 4 publications

(6 citation statements)

References 33 publications

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“…The results of the hardness and degree of conversion measurements confirmed the superior performance of the DC over the SC polymerization modes in both dual-cure core build-up restoratives, which agrees with the conclusions of a recent work [8] and previous studies [4][5][6]. These differences were registered after a prolonged specimen storage (3 weeks, dark/dry conditions at 37 • C), a period that included the contribution of delayed post-curing effects [17], which are especially important for slow-setting self-curing materials.…”

Section: Discussionsupporting

confidence: 91%

“…The results showed that the effects of the two touch-cure mechanisms tested on the composite base conversion were similar, regardless of the light-activation status (light-curing of the activator-containing CB adhesive, self-curing of the GB adhesive with the GA activator). Moreover, the mechanism was efficient for both composite materials with a different monomer composition (the Bis-GMA-based CF and the aliphatic UDMA-based GC) and reactivity [4,8]. Therefore, the previously documented higher bond strength to root canal dentine of core build-up materials combined with light-cured activator containing adhesives in comparison with their dual-cured versions, may be rather associated with the adhesive film properties than the conversion of the main resin composite restorative, [18].…”

Section: Discussionmentioning

confidence: 99%

“…Most of these materials are currently available in a flowable consistency containing light-curing catalysts and self-curing redox systems (i.e., amine-peroxide) for the adequate bulk curing of regions inaccessible to the activating light. However, a significant hysteresis of self-curing over dual-curing polymerization has been registered in many commercially available core build-up products affecting a series of properties with clinical implications such as the residual monomer, degree of conversion of C=C bonds, cross-linking density, hardness, flexural strength, elastic modulus and brittleness [1][2][3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

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The Effect of Touch-Cure Polymerization on the Conversion and Hardness of Core Build-Up Resin Composites: A Laboratory Study

et al. 2021

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To improve the self-curing capacity and interfacial strength with dentine of dual-cured composite materials, touch-cure activators have been introduced. The aim of the study was to evaluate the effect of these activators on the hardness and conversion of dual-cured resin composite core build-up restoratives. The materials tested were Clearfil DC Core Plus (CF) and Gradia Core (GC) with the corresponding adhesives Clearfil S3 Bond Plus (for CF) and G-Premio Bond/G-Premio DCA activator (for GC). Disk-shaped specimens (n = 6/group) were prepared for the following groups: dual-cured, self-cured and self-cured in contact with the adhesive activators at the bottom surface. After a 3-week storage period (dark/dry/37 °C) the Martens hardness (HM) and degree of conversion (DC%) were determined for the previously mentioned groups and the top surfaces of groups in contact with the adhesives. A statistical analysis was performed by a one-way ANOVA and Holm–Sidak test per material and a Pearson’s correlation analysis (HM vs. DC%) at an α = 0.05. The self-cured specimens resulted in significantly lower HM and DC% values from the dual-cured group, as expected. However, in the presence of the adhesives with touch-cure activators, the conversion of the self-cured groups showed insignificant differences in HM and DC% from the dual-cured in both composite materials. The improvements on the bottom composite surfaces in contact with the adhesives did not extend to the entire specimen length. Nevertheless, improved interfacial curing may improve interfacial durability.

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Section: Discussionsupporting

confidence: 91%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Effect of Touch-Cure Polymerization on the Conversion and Hardness of Core Build-Up Resin Composites: A Laboratory Study

et al. 2021

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“…The degree of conversion can be determined using FTIR spectroscopy [ 27 ] and Raman spectroscopy [ 28 , 29 ]. Several methods exist for measuring the hardness of resin-based materials, including the Vickers [ 30 , 31 ], Knoop [ 24 , 29 ], and Martens hardnesses [ 32 , 33 ]. However, it is important to note that hardness measurements may not always be feasible, particularly if the dual-cure resin cement is too soft.…”

Section: Discussionmentioning

confidence: 99%

Impact of CAD/CAM Material Thickness and Translucency on the Polymerization of Dual-Cure Resin Cement in Endocrowns

Ikemoto,

Komagata,

Yoshii

et al. 2024

Polymers

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The objective of this study is to evaluate the impact of the thickness and translucency of various computer-aided design/computer-aided manufacturing (CAD/CAM) materials on the polymerization of dual-cure resin cement in endocrown restorations. Three commercially available CAD/CAM materials—lithium disilicate glass (e.max CAD), resin composite (CERASMART), and a polymer-infiltrated ceramic network (ENAMIC)—were cut into plates with five different thicknesses (1.5, 3.5, 5.5, 7.5, and 9.5 mm) in both high-translucency (HT) and low-translucency (LT) grades. Panavia V5, a commercial dual-cure resin cement, was polymerized through each plate by light irradiation. Post-polymerization treatment was performed by aging at 37 °C for 24 h under light-shielding conditions. The degree of conversion and Vickers hardness measurements were used to characterize the polymerization of the cement. The findings revealed a significant decrease in both the degree of conversion and Vickers hardness with increasing thickness across all CAD/CAM materials. Notably, while the differences in the degree of conversion and Vickers hardness between the HT and LT grades of each material were significant immediately after photoirradiation, these differences became smaller after post-polymerization treatment. Significant differences were observed between samples with a 1.5 mm thickness (conventional crowns) and those with a 5.5 mm or greater thickness (endocrowns), even after post-polymerization treatment. These results suggest that dual-cure resin cement in endocrown restorations undergoes insufficient polymerization.

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“…The gel content and swelling ratio are usually used to characterize the crosslink density of composite materials. [19][20][21] In addition, some methods allow one or more reaction groups to be evaluated as a function of time, such as Nuclear magnetic resonance (NMR) spectroscopy, [22][23][24][25] attenuation total reflectance Fourier transformation infrared spectrometry (ATR-FTIR) [26][27][28][29][30] and Raman spectroscopy. [31,32] To date, it seems that there is no study demonstrating the impact of the degree of C=C conversion (DC) on dielectric loss.…”

Section: Introductionmentioning

confidence: 99%

Relationships of the Degree of C=C Double Bond Conversion with the Dielectric Properties for SiO₂/1,2‐PB/SBS/EPDM Composites Cured by Organic Peroxide

et al. 2022

ChemistrySelect

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Polymer materials with low dielectric constant and dielectric loss play an indispensable role in high speed and stable signal transmission of electronic components. In this work, the SiO 2 / 1,2-polybutadiene/ styrene-butadiene-styrene triblock copolymer/ ethylene-propylene-diene terpolymer (SiO 2 /1,2-PB/SBS/ EPDM) composites were prepared with different content of organic peroxide (bis (1-(tert-butyl peroxide)-1-methyl ethyl)benzene, BIPB). A high degree of crosslinking reaction may occur during the curing process. Attenuation total reflectance Fourier transformation infrared spectrometry (ATR-FTIR) analysis showed that the degree of C=C conversion (DC) increased with the increase of BIPB content, and the dielectric constant of the composites was reduced. However, the dielectric loss decreased initially and subsequently increased. The excess initiators transform into impurities and increase the polarization and conductivity, resulting in a larger dielectric loss value of the composite. The combined results show that the DC value of 92.76 %, the dielectric constant of 3.37 and the dielectric loss of 0.0028 were obtained for the SiO 2 /1,2-PB/SBS/EPDM composites containing 3 part-by-weight (pbw) BIPB. Furthermore, the composite had good thermal stability and superior mechanical properties.

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Effect of curing mode on the conversion and IIT-derived mechanical properties of core build-up resin composites

Cited by 4 publications

References 33 publications

The Effect of Touch-Cure Polymerization on the Conversion and Hardness of Core Build-Up Resin Composites: A Laboratory Study

The Effect of Touch-Cure Polymerization on the Conversion and Hardness of Core Build-Up Resin Composites: A Laboratory Study

Impact of CAD/CAM Material Thickness and Translucency on the Polymerization of Dual-Cure Resin Cement in Endocrowns

Relationships of the Degree of C=C Double Bond Conversion with the Dielectric Properties for SiO₂/1,2‐PB/SBS/EPDM Composites Cured by Organic Peroxide

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Effect of curing mode on the conversion and IIT-derived mechanical properties of core build-up resin composites

Cited by 4 publications

References 33 publications

The Effect of Touch-Cure Polymerization on the Conversion and Hardness of Core Build-Up Resin Composites: A Laboratory Study

The Effect of Touch-Cure Polymerization on the Conversion and Hardness of Core Build-Up Resin Composites: A Laboratory Study

Impact of CAD/CAM Material Thickness and Translucency on the Polymerization of Dual-Cure Resin Cement in Endocrowns

Relationships of the Degree of C=C Double Bond Conversion with the Dielectric Properties for SiO2/1,2‐PB/SBS/EPDM Composites Cured by Organic Peroxide

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Product

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Relationships of the Degree of C=C Double Bond Conversion with the Dielectric Properties for SiO₂/1,2‐PB/SBS/EPDM Composites Cured by Organic Peroxide