Effects of a low-shrinkage methacrylate monomer and monoacylphosphine oxide photoinitiator on curing efficiency and mechanical properties of experimental resin-based composites

Manojlović, Dragica; Dramićanin, Miroslav D.; Milošević, Miloš; Zeković, Ivana; Cvijović‐Alagić, Ivana; Mitrović, Nenad; Miletić, Vesna

doi:10.1016/j.msec.2015.08.054

Cited by 28 publications

(22 citation statements)

References 32 publications

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“…There are some concerns that their monomers or degradation products may be cytotoxic. 17,23 However, studies have shown that monomers like, for instance, PETA can be used for bone tissue engineering. 14,24 Cytotoxicity seems to be no serious problem for the polymerized material and alternative scaffold materials are under development.…”

Section: Discussionmentioning

confidence: 99%

“…PETA was chosen due to its good biocompatibility, 14,15 and BisGMA (a material frequently used for dental fillings) for its mechanical stability. 16,17 The solvent propylene glycol methyl ether acetate (PGMEA) was added to achieve good mixing of the constituents and sufficient fluidity of the photoresist.…”

Section: Methodsmentioning

confidence: 99%

“…A (80/20) mixture of the two acrylate monomers pentaerythritol triacrylate (PETA, Sigma‐Aldrich) and bisphenol A glycidyl methacrylate (BisGMA, Esschem Europe, Durham, UK) was used, including 2 wt % Irgacure 819 (BASF, Ludwigshafen, Germany)—an efficient photosensitive initiator of the radical polymerization chain reaction in acryl‐based compounds. PETA was chosen due to its good biocompatibility, and BisGMA (a material frequently used for dental fillings) for its mechanical stability . The solvent propylene glycol methyl ether acetate (PGMEA) was added to achieve good mixing of the constituents and sufficient fluidity of the photoresist.…”

Section: Methodsmentioning

confidence: 99%

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Bone‐forming cells with pronounced spread into the third dimension in polymer scaffolds fabricated by two‐photon polymerization

Heitz

Plamadeala

Wiesbauer

et al. 2016

J Biomedical Materials Res

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The main aim of this work was to stimulate bone‐forming cells to produce three‐dimensional networks of mineralized proteins such as those occurring in bones. This was achieved by a novel approach using a specific type of mesenchymal progenitor cells (i.e., primary fibroblast cells from human hair roots) seeded on to polymer scaffolds. We wrote polymer microstructures with one or more levels of quadratic pores on to a flexible substrate by means of two‐photon polymerization using a Ti‐sapphire femtosecond laser focused into a liquid acrylate‐based resin containing a photoinitiator. Progenitor cells, differentiated into an osteogenic lineage by the use of medium supplemented with biochemical stimuli, can be seeded on to the hydrophilic three‐dimensional scaffolds. Due to confinement to the microstructures and/or mechanical interaction with the scaffold, the cells are stimulated to produce high amounts of calcium‐binding proteins, such as collagen type I, and show an increased activation of the actin cytoskeleton. The best results were obtained for quadratic pore sizes of 35 µm: the pore volumes become almost filled with both cells in close contact with the walls of the structure and with extracellular matrix material produced by the cells. © 2016 Wiley Periodicals, Inc. J Biomed Mater Res Part A: 105A: 891–899, 2017.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Bone‐forming cells with pronounced spread into the third dimension in polymer scaffolds fabricated by two‐photon polymerization

Heitz

Plamadeala

Wiesbauer

et al. 2016

J Biomedical Materials Res

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“…Molds were placed horizontally on the flat table under camera system mounted and directed at the samples from above. Digital images were taken immediately after placing the molds under the cameras and then one new image was taken on each 20 s. During curing process which was lasted 20 min, 60 images of each sample were taken and analyzed using specialist software (Aramis 6.2.0) to determine von Mises strain, ɛ, which represents criteria for the 3D deformation analysis in the x‐, y‐, and z‐ axes of the photographed surfaces . The von Mises strain, ɛ, was determined by the software according to Eq .…”

Section: Methodsmentioning

confidence: 99%

Effects of oxidized/treated non‐metallic fillers obtained from waste printed circuit boards on mechanical properties and shrinkage of unsaturated polyester‐based composites

et al. 2018

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The investigation of the influence of acid/base treatment and addition level of non‐metallic fractions (NMFs), obtained by processing of printed circuit boards, on the mechanical properties and shrinkage of unsaturated polyester resin (UPR)‐based composites was main topic presented in this paper. NMF particles were treated using four different oxidative/etching agents: H2SO4/KMnO4 (NMF1), H2SO4/HNO3 (NMF2), HNO3 (NMF3), and NaOH (NMF4). Treated NMF(1–4) particles were characterized using fourier transform infrared, Boehm titration, optical microscopy and SEM analysis. Tensile strength and micro Vickers hardness of UPR/NMF(1–4) composites were the most improved with addition of 0.5wt% of filler, for 5.9–24.7%, in comparison to composite filled with non‐treated NMF particles. Cross‐linking density (ν), storage, and loss modulus (G' and G''), damping factor (tanδ) and glass transition temperature (Tg) of the composites were determined from the dynamic–mechanical analysis (DMA) testing. Shrinkage measurements, performed using Aramis 6.2.0, showed significant improvement in shrinkage reducing, for 17.8–30.6%, by introduction the oxidized NMF particles. Qualitative/quantitative evaluation of NMF(1–4) surface functionalities helped in understanding their influences on mechanical, DMA and shrinkage properties change of studied composites. POLYM. COMPOS., 40:1170–1186, 2019. © 2018 Society of Plastics Engineers

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“…Previous work has also identified the curing depth limitations of using high molar absorptivity photoinitiators alone [18,19,21]. Others have reported improved depths of cure when high and lower absorptivity properties are combined with dual initiation, although not usually exceeding those materials containing only CQ [22,23].…”

Section: Molar Absorptivitymentioning

confidence: 99%

Shining a light on high volume photocurable materials

2018

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Spatial and temporal control is a key advantage for placement and rapid setting of light-activated resin composites. Conventionally, placement of multiple thin layers (<2mm) reduces the effect of light attenuation through highly filled and pigmented materials to increase polymerisation at the base of the restoration. However, and although light curing greater than 2mm thick layers is not an entirely new phenomenon, the desire amongst dental practitioners for even more rapid processing in deep cavities has led to the growing acceptance of so-called "bulk fill" (4-6mm thick) resin composites that are irradiated for 10-20s in daily clinical practice. The change in light transmission and attenuation during photopolymerisation are complex and related to path length, absorption properties of the photoinitiator and pigment, optical properties of the resin and filler and filler morphology. Understanding how light is transmitted through depth is therefore critical for ensuring optimal material properties at the base of thick increments. This article will briefly highlight the advent of current commercial materials that rationalise bulk filling techniques in dentistry, the relationship between light transmission and polymerisation and how optimal curing depths might be achieved.

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Effects of a low-shrinkage methacrylate monomer and monoacylphosphine oxide photoinitiator on curing efficiency and mechanical properties of experimental resin-based composites

Cited by 28 publications

References 32 publications

Bone‐forming cells with pronounced spread into the third dimension in polymer scaffolds fabricated by two‐photon polymerization

Bone‐forming cells with pronounced spread into the third dimension in polymer scaffolds fabricated by two‐photon polymerization

Effects of oxidized/treated non‐metallic fillers obtained from waste printed circuit boards on mechanical properties and shrinkage of unsaturated polyester‐based composites

Shining a light on high volume photocurable materials

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