scholarly journals Light Transmittance and Polymerization of Bulk-Fill Composite Materials Doped with Bioactive Micro-Fillers

Materials ◽  
2019 ◽  
Vol 12 (24) ◽  
pp. 4087 ◽  
Author(s):  
Phoebe Dieckmann ◽  
Dirk Mohn ◽  
Matthias Zehnder ◽  
Thomas Attin ◽  
Tobias T. Tauböck
Keyword(s):  
Detection Limit ◽  
Portland Cement ◽  
Bioactive Glass ◽  
Knoop Hardness ◽  
Light Transmittance ◽  
Resin Composites ◽  
Bottom To Top ◽  
Glass Fillers ◽  
Barium Glass ◽  
Micro Fillers

This study investigated the effect of bioactive micro-fillers on the light transmittance and polymerization of three commercially available bulk-fill resin composites. These were mixed with 20 wt% bioactive glass 45S5, Portland cement, inert dental barium glass, or nothing (controls). Composites were photo-activated and light transmittance through 4 mm thick specimens was measured in real time. Moreover, degree of conversion (DC) and Knoop hardness (KHN) were assessed. Light transmittance of all bulk-fill composites significantly decreased (p < 0.05) with addition of 20 wt% bioactive glass 45S5 but not when inert barium glass was added. For bulk-fill composites modified with Portland cement, light irradiance dropped below the detection limit at 4 mm depth. The DC at the top surface of the specimens was not affected by addition of bioactive or inert micro-fillers. The bottom-to-top ratio of both DC and KHN surpassed 80% for bulk-fill composites modified with 20 wt% bioactive or inert glass fillers but fell below 20% when the composites were modified with Portland cement. In contrast to Portland cement, the addition of 20 wt% bioactive glass maintains adequate polymerization of bulk-fill composites placed at 4 mm thickness, despite a decrease in light transmittance compared to the unmodified materials.

scholarly journals Cytotoxicity of resin composites containing bioactive glass fillers

2015 ◽  
Vol 31 (2) ◽  
pp. 195-203 ◽  
Author(s):  
Satin Salehi ◽  
Fernanda Gwinner ◽  
John C. Mitchell ◽  
Carmem Pfeifer ◽  
Jack L. Ferracane
Keyword(s):  
Bioactive Glass ◽  
Resin Composites ◽  
Glass Fillers

scholarly journals Polymerization kinetics of experimental resin composites functionalized with conventional (45S5) and a customized low-sodium fluoride-containing bioactive glass

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Matej Par ◽  
Katica Prskalo ◽  
Tobias T. Tauböck ◽  
Hrvoje Skenderovic ◽  
Thomas Attin ◽  
...  
Keyword(s):  
Bioactive Glass ◽  
Polymerization Kinetics ◽  
Light Transmittance ◽  
Polymerization Reaction ◽  
Resin Composites ◽  
Dental Resin ◽  
Low Sodium ◽  
Dental Resin Composites ◽  
Light Curing ◽  
Thick Layers

AbstractThis study aimed to investigate polymerization kinetics and curing light transmittance of two series of experimental dental resin composites filled with 0–40 wt% of either 45S5 bioactive glass (BG) or a customized low-Na F-containing BG. Polymerization kinetics in 0.1-mm and 2-mm thick layers were investigated through real-time degree of conversion measurements using a Fourier transform infrared (FTIR) spectrometer. FTIR spectra were continuously collected at a rate of 2 s−1 during light-curing (1340 mW/cm2). Light transmittance through 2-mm thick composite specimens was measured using a UV–Vis spectrometer at a rate of 20 s−1. Unlike BG 45S5, which led to a dose-dependent reduction in the rate and extent of polymerization, the customized low-Na F-containing BG showed a negligible influence on polymerization. The reduction in light transmittance of experimental composites due to the addition of the low-Na F-containing BG did not translate into impaired polymerization kinetics. Additionally, the comparison of polymerization kinetics between 0.1-mm and 2-mm thick layers revealed that polymerization inhibition identified for BG 45S5 was not mediated by an impaired light transmittance, indicating a direct effect of BG 45S5 on polymerization reaction. A customized low-Na F-containing BG showed favourable behaviour for being used as a functional filler in light-curing dental resin composites.

scholarly journals Curing Depth of Light-activated Nanofiller containing Resin Composites

2012 ◽  
Vol 3 (2) ◽  
pp. 119-125 ◽  
Author(s):  
Werner J Finger ◽  
Masafumi Kanehira ◽  
Yasuyuki Araki ◽  
Takehiko Wada ◽  
Andreas Utterodt ◽  
...  
Keyword(s):  
Crosslink Density ◽  
Mechanical Characteristics ◽  
Polynomial Regression ◽  
Knoop Hardness ◽  
Resin Composites ◽  
Depth Level ◽  
Depth Of Cure ◽  
Micro Raman Spectroscopy ◽  
Parallel Lines ◽  
Order Polynomial

ABSTRACT Objective To compare the depth of cure of nanofiller containing with conventional resin composites. Materials and methods Five nanofilled and nanohybrid composites were investigated and compared with a microfilled and a microhybrid reference, using the ISO 4049 scraping test, Knoop hardness (KHN) and DC profiling. Specimens from all materials (shade A3) were activated with the same LED light source for 20s. KHN (0.25N/15s) of three specimens each, produced in split molds was measured after 24 hours dark storage on sections perpendicular to the irradiated surface at 250 µm distance along the center line and two parallel lines, 0.5 mm apart, to a depth of 3 mm. Mean KHNs of the three neighboring indentations at each level were calculated. Degree of conversion (DC) was determined on specimens as mentioned above using micro-Raman spectroscopy at 125 µm distance with three measurements at each depth level. Results The depth of cure of all materials was >2 mm when determined according to the ISO test. KHN and DC data followed second order polynomial regression lines (r2 > 0.70; p < 0.001). At 2 mm depth, the KHN of six resin composites was ≤80% of the top KHN whereas the DC of all materials was ≥86% of the maximum DC at the irradiated surface. Conclusion The ISO scraping test overemphasizes the attainable depth of cure, when compared with 80% of top KHN as arbitrarily defined curing depth. KHNs reflect the crosslink density of the polymer, whereas DC additionally includes double bond conversions not contributing to enhancement of mechanical characteristics. How to cite this article Kanehira M, Araki Y, Finger WJ, Wada T, Utterodt A, Komatsu M. Curing Depth of Light-activated Nanofiller containing Resin Composites. World J Dent 2012;3(2): 119-125.

Correlation between mechanical and dielectric relaxation processes in epoxy resin composites with nano- and micro-fillers

2012 ◽  
Vol 95 (9) ◽  
pp. 1-9 ◽  
Author(s):  
Mayumi Hyuga ◽  
Toshikatsu Tanaka ◽  
Yoshimichi Ohki ◽  
Takahiro Imai ◽  
Miyuki Harada ◽  
...  
Keyword(s):  
Dielectric Relaxation ◽  
Epoxy Resin ◽  
Relaxation Processes ◽  
Resin Composites ◽  
Epoxy Resin Composites ◽  
Micro Fillers

Ion release and hydroxyapatite precipitation of resin composites functionalized with two types of bioactive glass

2022 ◽  
pp. 103950
Author(s):  
Matej Par ◽  
Andrea Gubler ◽  
Thomas Attin ◽  
Zrinka Tarle ◽  
Andro Tarle ◽  
...  
Keyword(s):  
Bioactive Glass ◽  
Resin Composites ◽  
Ion Release

scholarly journals In Vitro Enamel Remineralization Efficacy of Calcium Silicate-Sodium Phosphate-Fluoride Salts versus NovaMin Bioactive Glass, Following Tooth Whitening

2021 ◽  
Author(s):  
Hatem M. El-Damanhoury ◽  
Nesrine A. Elsahn ◽  
Soumya Sheela ◽  
Talal Bastaty
Keyword(s):  
Surface Roughness ◽  
Bioactive Glass ◽  
Calcium Silicate ◽  
Sodium Phosphate ◽  
Knoop Hardness ◽  
High Concentration ◽  
Negative Effect ◽  
Post Hoc ◽  
Fluoride Salts

Abstract Objectives This study aimed to evaluate the effect of in-office bleaching on the enamel surface and the efficacy of calcium silicate-sodium phosphate-fluoride salt (CS) and NovaMin bioactive glass (NM) dentifrice in remineralizing bleached enamel. Materials and Methods Forty extracted premolars were sectioned mesio-distally, and the facial and lingual enamel were flattened and polished. The samples were equally divided into nonbleached and bleached with 38% hydrogen peroxide (HP). Each group was further divided according to the remineralization protocol (n = 10); no remineralization treatment (nontreated), CS, or NM, applied for 3 minutes two times/day for 7 days, or CS combined with NR-5 boosting serum (CS+NR-5) applied for 3 minutes once/day for 3 days. The average Knoop hardness number (KHN) and surface roughness (utilizing atomic force microscopy) were measured. Surface topography/elemental analysis was analyzed by using scanning electron microscopy/energy dispersive X-ray analysis. All the tests were performed at baseline, after bleaching, and following each remineralization protocol. Data were statistically analyzed by two-way analysis of variance and Bonferroni post hoc multiple comparison tests (α = 0.05). Results HP significantly reduced KHN and increased roughness (p < 0.05). All remineralization materials increased the hardness and reduced the surface roughness after bleaching except NM, which demonstrated significantly increased roughness (p < 0.05). Ca/P ratio decreased after bleaching (p < 0.05), and following treatment, CS and CS+NR-5 exhibited higher remineralization capacity in comparison to NM (p < 0.05). Conclusion Although none of the material tested was able to reverse the negative effect of high-concentration in-office HP on enamel completely, the remineralization efficacy of CS and CS+NR-5 was superior to that of NM.

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