Examining the Effect of Radiant Exposure on Commercial Photopolimerizable Dental Resin Composites

Cuevas‐Suárez, Carlos Enrique; Pimentel-García, Belinda; Rivera-Gonzaga, Alejandro; Álvarez-Gayosso, Carlos; Ancona-Meza, Adriana Leticia; Grazioli, Guillermo; Zamarripa-Calderón, Juan Eliezer

doi:10.3390/dj6040055

Cited by 12 publications

(12 citation statements)

References 38 publications

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“…This finding is in agreement with the hypothesis that the moderate radiant exitance with extended curing times generates high DC, densely crosslinked polymer networks, which yield higher modulus [ 32 ]. Similar results are found in other studies examining the dependence of FM to different radiation energies [ 33 , 34 , 35 ]. Radiant exposure, a product of radiant exitance and the exposure time [ 6 ], shows the amount of energy per unit of surface area the specimens received.…”

Section: Discussionsupporting

confidence: 91%

Rapid 3 s Curing: What Happens in Deep Layers of New Bulk-Fill Composites?

et al. 2021

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This study assessed the influence of rapid 3 s light curing on the new generation of bulk-fill resin composites under the simulated aging challenge and depths up to 4 mm. Four bulk-fill materials were tested: two materials designed for rapid curing (Tetric PowerFill—PFILL; Tetric PowerFlow—PFLW) and two regular materials (Filtek One Bulk Fill Restorative—FIL; SDR Plus Bulk Fill Flowable—SDR). Three-point bending (n = 10) was used to measure flexural strength (FS) and flexural modulus (FM). In the 3 s group, two 2 mm thick specimens were stacked to obtain 4 mm thickness, while 2 mm-thick specimens were used for ISO group. Specimens were aged for 1, 30, or 30 + 3 days in ethanol. The degree of conversion (DC) up to 4 mm was measured by Raman spectroscopy. There was no difference between curing protocols in FS after 1 day for all materials except PFLW. FM was higher for all materials for ISO curing protocol. Mechanical properties deteriorated by increasing depth (2–4 mm) and aging. ISO curing induced higher DC for PFLW and FIL, while 3 s curing was sufficient for PFILL and SDR. The 3 s curing negatively affected FM of all tested materials, whereas its influence on FS and DC was highly material-specific.

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Section: Discussionsupporting

confidence: 91%

Rapid 3 s Curing: What Happens in Deep Layers of New Bulk-Fill Composites?

et al. 2021

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“…The final degree of conversion values determined for the neat Bis-GMA/TEGDMA resin and the total of the obtained dental nanocomposite resins and some representative commercially available dental composite resins are listed in Table 3 . The calculated conversions for the most resins varied between 54.2% and 59.5% and were almost comparable to those found in literature for Bis-GMA/TEGDMA systems ranging from 46.84% to 75% [ 21 , 62 , 63 , 64 ] and higher than two typically commercial Filtek TM Z350 XT and Tetric ® N-Ceram Bulk Fill [ 65 ]. Moreover, it is clear that dental nanocomposites loaded with neat nanosilica and S.QAMTESi modified nanoparticles slightly increased the ultimate double bond conversion of the organic monomers up to 54.98% and 55.67%, respectively.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of Novel Dental Nanocomposite Resins by Incorporating Polymerizable, Quaternary Ammonium Silane-Modified Silica Nanoparticles

et al. 2021

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Diverse approaches dealing with the reinforcement of dental composite resins with quaternary ammonium compounds (QAC) have been previously reported. This work aims to investigate the physicochemical and mechanical performance of dental resins containing silica nanofillers with novel QAC. Different types of quaternary ammonium silane compounds (QASiC) were initially synthesized and characterized with proton nuclear magnetic resonance (1H-NMR) and Fourier transform infrared (FTIR) spectroscopy. Silica nanoparticles were surface modified with the above QASiC and the structure of silanized products (S.QASiC) was confirmed by means of FTIR and thermogravimetric analysis. The obtained S.QASiC were then incorporated into methacrylate based dental resins. Scanning electron microscopy images revealed a satisfactory dispersion of silica nanoclusters for most of the synthesized nanocomposites. Curing kinetics disclosed a rise in both the autoacceleration effect and degree of conversion mainly induced by shorter QASiC molecules. Polymerization shrinkage was found to be influenced by the particular type of S.QASiC. The flexural modulus and strength of composites were increased by 74% and 19%, while their compressive strength enhancement reached up to 19% by adding 22 wt% S.QASiC nanoparticles. These findings might contribute to the proper design of multifunctional dental materials able to meet the contemporary challenges in clinical practice.

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“…The experimental values of the final DC (%) are listed in Table 2. Representative data for some commercial dental resins [64,65] are also given in Table 2.…”

Section: Resultsmentioning

confidence: 99%

“…Figure 7b shows the apparatus used for shrinkage measurements, as was discussed in Section 2.3. The total strain (%) values are listed in Table 2, while corresponding values are also included for several commercially available dental resins [64,65]. As it was expected, the setting contraction proceeds faster for pure matrix than nanocomposites, and reaches an ultimate strain value almost 3-fold higher compared to the majority of nanocomposites.…”

Section: Resultsmentioning

confidence: 99%

“…Their flexural modulus and strength dependence on the various OMMT type are shown in Figure 8a,b, respectively, while the corresponding mean values accompanied by standard deviations are listed in Table 2. Typical data are also included for some commercially available resins based on previous studies [64,65]. Concerning the flexural modulus, significant statistic differences were found to exist between Bis-GMA/TEGDMA and nanocomposites with MMT-DMAHDM, S.MMT-DMAHDM, and S.MMT-CTAC.…”

Section: Resultsmentioning

confidence: 99%

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Synthesis and Characterization of Dental Nanocomposite Resins Filled with Different Clay Nanoparticles

et al. 2019

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Nanotechnology comprises a promising approach towards the update of dental materials.The present study focuses on the reinforcement ofdental nanocomposite resins with diverse organomodified montmorillonite (OMMT) nanofillers. The aim is to investigate whether the presence of functional groups in the chemical structure of the nanoclay organic modifier may virtually influence the physicochemical and/or the mechanical attitude of the dental resin nanocomposites. The structure and morphology of the prepared materials were investigated by means of wide angle X-ray diffraction and scanning electron microscopy analysis. Fourier transform infrared spectroscopy was used to determine the variation of the degree of conversion over time. Measurements of polymerization shrinkage and mechanical properties were conducted with a linear variable displacement transducer apparatus and a dynamometer, respectively. All the obtained nanocomposites revealed intercalated structures and most of them had an extensive filler distribution into the polymer matrix. Polymerization kinetics werefound to be influenced by the variance of the clay organomodifier, whilenanoclays with vinyl groups considerably increased the degree of conversion. Polymerization shrinkage was almost limited up to 50% by incorporating nanoclays. The absence of reactive groups in the OMMT structure may retain setting contraction atlow levels. An enhancement of the flexural modulus was observed, mainly by using clay nanoparticles decorated with methacrylated groups, along with a decrease in the flexural strength at a high filler loading. The overall best performance was found for the nanocomposites with OMMTs containing double bonds. The significance of the current work relies on providing novel information about chemical interactions phenomena between nanofillers and the organic matrix towards the improvement of dental restorative materials.

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Examining the Effect of Radiant Exposure on Commercial Photopolimerizable Dental Resin Composites

Cited by 12 publications

References 38 publications

Rapid 3 s Curing: What Happens in Deep Layers of New Bulk-Fill Composites?

Rapid 3 s Curing: What Happens in Deep Layers of New Bulk-Fill Composites?

Synthesis of Novel Dental Nanocomposite Resins by Incorporating Polymerizable, Quaternary Ammonium Silane-Modified Silica Nanoparticles

Synthesis and Characterization of Dental Nanocomposite Resins Filled with Different Clay Nanoparticles

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