Post-curing in dental resin-based composites

Germscheid, William; Gorre, Louis Gosse de; Sullivan, Braden; O’Neill, Catherine; Price, Richard; Labrie, D.

doi:10.1016/j.dental.2018.06.021

Cited by 31 publications

(22 citation statements)

References 42 publications

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“…4). This indicated that the polymerization reaction continued after the photo-activation step, as already demonstrated by several studies [29][30][31] . When the post-curing deformation per cusp in groups G1 and G2 was compared, it was evident that in group G1 it continued to gradually increase until the end of the examined period, unlike the absence of such progress in group G2 (Fig.…”

Section: Discussionsupporting

confidence: 75%

“…Nevertheless, the research conducted by Germscheid et al 31 stated that examination of the post-curing period of contemporary RDMs, should cover a time interval longer than 1 h (up to 15 h), due to the significant amount of measured post-curing shrinkage. Further evaluation in a prolonged period could be a topic of another study, using a modified examination protocol by recording the interference images every 10-15 min i.e., thereby rationalizing hard-disk memory storage.…”

Section: Discussionmentioning

confidence: 99%

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The cuspal deflection caused by dental composite polymerization shrinkage analyzed by digital holography

et al. 2022

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Background/Aim. The objective of this study was to measure tooth cusps deflection caused by polymerization shrinkage of a resin-based dental material (RDM), in real-time using digital holographic interferometry (DHI), in two groups of cavities restored with and without an additional wall. Simultaneously, internal tooth mechanical behavior was monitored. Methods. Standardized three class I cavities were prepared on third molar teeth. The teeth were cut in two halves in the longitudinal plane, obtaining six samples for the study (now with class II cavities), divided into two groups (group G1 - with the additional wall, group G2 - without it) and mounted in aluminum blocks. The cavities were filled with the RDM, cured with a light emitting diode (LED) for 40 s from the occlusal direction, and monitored during the curing and post-curing period using DHI. Data were analyzed using student's t-test for independent samples and Anderson-Darling test, with an alpha level of 0.05. Results. At the end of the examined period, the samples from group G1 showed significantly increased tooth cusps deflection (t (10) = 4.7; p = 0.001) compared to samples from group G2. Conclusion. Within the limitations of this study, it was concluded that the presence of the additional wall simulating a dental matrix-band, influenced increased and prolonged tooth cusps deflection during the examined RDM polymerization shrinkage.

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Section: Discussionsupporting

confidence: 75%

Section: Discussionmentioning

confidence: 99%

The cuspal deflection caused by dental composite polymerization shrinkage analyzed by digital holography

et al. 2022

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“…It is well known that the polymerization reaction of light-activated composites continues even after the exposure to visible light irradiation is interrupted. 18 Although, during initial polymerization, free radicals located at the functional groups of unreacted molecules can be quenched within the polymer network due to rapid increase in viscosity, 19 our findings suggest that even low radiant exposures to visible light can provide the unreacted molecules with sufficient molecular mobility that allows for additional polymerization in the organic matrix to proceed.…”

Section: Discussionmentioning

confidence: 79%

Effect of radiant exposure and UV accelerated aging on physico-chemical and mechanical properties of composite resins

et al. 2019

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Currently, there is no consensus in terms of defining the minimum radiant exposure values necessary for achieving adequate properties of composite resin. In addition, the long-term influence that radiant exposure has on the properties of composite resins is still questionable. Objective: The objective of this study was to evaluate the effect of radiant exposure and UV accelerated aging on the physico-chemical and mechanical properties of micro-hybrid and nanofilled composite resins. Material and Methods: A nanofilled (Filtek Supreme; 3M ESPE) and a micro-hybrid composite resin (Filtek Z250; 3M ESPE) were investigated under different radiant exposures (3.75, 9, and 24 J/cm2) and UV accelerated aging protocols (0, 500, 1000, and 1500 aging hours). The degree of conversion (DC), flexural strength (FS), modulus (M), water sorption (WS), and solubility (WL) were evaluated. The results obtained were analyzed using two-way ANOVA and Tukey's test. Comparisons were performed using a significance level of α=0.05. Results: The DC, FS, and M were found to be significantly influenced by both radiant exposure and accelerated aging time. The DC and EM increased with radiant exposure in the no-aging group (0-hour aging) for both micro-hybrid and nanofilled composites, whereas no correlation was found after accelerated aging protocols. WS and WL of micro-hybrid and nanofilled composite resins were scarcely affected by radiant exposure (p>0.05), whereas they were significantly reduced by accelerated aging (p<0.001). Conclusions: Although increasing radiant exposure affected the degree of conversion and mechanical properties of micro-hybrid and nanofilled composites, no influence on the hydrolytic degradation of the material was observed. In contrast, UV accelerated aging affected both the physico-chemical and mechanical properties of the composites.

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“…Compared to artisanal composites, the homogeneity of CAD/CAM industrial composite blocks are better, with fewer flaws and pores (Giordano, 2006) but above all it allows overcoming an important drawback which is their incomplete polymerization because of more efficient polymerization methods. Indeed, conventional photopolymerization results in low DC (55-69%) (Al-Ahdal et al, 2015;Ferracane, 2011;Germscheid et al, 2018;Par et al, 2020). As DC is related to mechanical properties and monomer release, low DC results in poor mechanical properties (Ferracane, 2013), and biological risks because of the release of monomers in oral environment (Barutcigil et al, 2020;Bouillaguet, 2004).…”

Section: Introductionmentioning

confidence: 99%

Influence of polymerization pressure and post-cure treatment on conversion degree and viscoelastic properties of polymer infiltrated ceramic network

Pomès

Béhin

Jordan

et al. 2021

Journal of the Mechanical Behavior of Biomedical Materials

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This study aimed at determining an optimum polymerization pressure for Polymer Infiltrated Ceramic Network (PICN) blocks by characterizing the conversion degree (DC) and the viscoelastic properties of experimental PICN blocks polymerized at 90 • C under various high pressures followed or not by post-cure treatment (PC). Near infrared analysis and dynamic mechanical analysis were used to characterize DC and viscoelastic properties of sixteen PICN: one control (thermo-cured) and fifteen experimental groups (one thermo-cured followed by PC and fourteen high pressure polymerized PICN, in the range of 50-350 MPa without and with PC). Conversion degree of high pressure polymerized PICN blocks without post curing displays an optimum between 100 and 150 MPa resulting in an improved E ′ and T g . Post curing induces a higher DC with a controversial effect on thermomechanical properties. The results suggested that 100-150 MPa without PC is an optimum polymerization parameter, resulting in PICN blocks with significantly better DC, T g , E'.

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Post-curing in dental resin-based composites

Cited by 31 publications

References 42 publications

The cuspal deflection caused by dental composite polymerization shrinkage analyzed by digital holography

The cuspal deflection caused by dental composite polymerization shrinkage analyzed by digital holography

Effect of radiant exposure and UV accelerated aging on physico-chemical and mechanical properties of composite resins

Influence of polymerization pressure and post-cure treatment on conversion degree and viscoelastic properties of polymer infiltrated ceramic network

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