A comparison of efficiency of two photoinitiators for polymerization of light‐cure dental composite resins

Lizymol, P. P.; Krishnan, V. Kalliyana

doi:10.1002/app.27493

Cited by 12 publications

(11 citation statements)

References 47 publications

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“…Freeze-dried swollen hydrogels samples were fixed Figure 1 Key steps of the mechanism of visible light photoinitiation of free radical polymerization by CQ/amine systems. 12 on aluminum disks with a carbon band and were coated with gold by vapor deposition. Brightness and contrast of each SEM photograph were carefully adjusted to the same level, because the pore size detection by images analysis software is based upon the gray-scale of the images.…”

Section: Sem Investigationmentioning

confidence: 99%

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Crosslinking behavior of dextran modified with hydroxyethyl methacrylate upon irradiation with visible light—Effect of concentration, coinitiator type, and solvent

Kamoun

Menzel

2010

J of Applied Polymer Sci

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This study presents the synthesis of a crosslinkable dextran as starting material for the development of new hydrogels as drug delivery system in dental applications. 2-Hydroxyethyl methacrylate (HEMA) was coupled to dextran after activation with carbonyldiimidazole as monitored by FTIR and 1 H-NMR spectroscopy. The Dex-HEMA was crosslinked by visible light in the presence of camphorquinone (CQ) as photoinitiator and a coinitiator in a proper solvent. Aliphatic or aromatic amines were used as coinitiators and the content of the coinitiator was varied from 0.25 to 3.0 mol %. Diphenyliodonium chloride was added as a third component to the above photoinitiation system. It was observed that, the degree of swelling decreased upon an increase of Dex-HEMA concentration and the water content in the solvent system due to formation of more crosslinking points, that is, increasing crosslink density (P x ). The type of coinitiator shows a prominent impact on the swelling behavior and crosslinking efficiency of hydrogels. Special cryofixation and cryofracture techniques were used to investigate the surface and interior of swollen Dex-HEMA hydrogel samples by SEM. V C

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Section: Sem Investigationmentioning

confidence: 99%

“… Key steps of the mechanism of visible light photoinitiation of free radical polymerization by CQ/amine systems 12…”

Section: Introductionmentioning

confidence: 99%

Crosslinking behavior of dextran modified with hydroxyethyl methacrylate upon irradiation with visible light—Effect of concentration, coinitiator type, and solvent

Kamoun

Menzel

2010

J of Applied Polymer Sci

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“…Efforts to enhance the quality of the polymer matrix have investigated alternative photosensitizers suitable for dental resins. [7][8][9] 2,2-Dimethoxy-2-phenylacetophenone (DMPA) is a very efficient and frequently used free radical photoinitiator for thin photocurable coatings ($ 20 lm). 10,11 The colorless nature of DMPA makes it very attractive for the formulation of dental resins with improved esthetical properties.…”

Section: Introductionmentioning

confidence: 99%

Efficiency of 2,2‐dimethoxy‐2‐phenylacetophenone for the photopolymerization of methacrylate monomers in thick sections

Mucci

Vallo

2011

J of Applied Polymer Sci

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The efficiency of 2,2-Dimethoxy-2-phenylacetophenone (DMPA) for the photopolymerization of methacrylate monomers in thick sections was assessed. DMPA is an efficient photoinitiator for thick sections (%2 mm) because a fast reaction and high conversions are obtained with concentrations as low as 0.25 wt % DMPA. The polymerization rate increased when the DMPA content increased from 0.125 wt % to 0.25 wt %. However, the conversion versus irradiation time profiles in resins containing 0.25 wt % or 0.5 wt % DMPA were similar. This is attributed to the screening effect caused by excessive levels of DMPA. In addition, the consumption of DMPA under UV irradiation was accompanied by the appearance of light absorbing photoproducts. Because the absorbing species nearest to the light source absorb part of it, the light fails to reach the deeper layers of the sample. The overall effect of light screening is a reduced photoinitiation rate and double bond conversion along the irradiation path. This effect was compensated by the use of irradiation sources of higher intensity; which increased the initiation rate by increasing the production of primary radicals. DMPA is colorless and it does not require the presence of amine as coinitiator. These properties make DMPA attractive as photoinitiator of dental composites.

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“…The restoration of teeth commonly involves a methacrylate based dental composition that is polymerized in air in the presence of suitable photoinitiating systems (PISs) . The most commonly used PISs are based on a photoinitiator (camphorquinone, CQ) and a co‐initiator (such as ethyldimethylaminobenzoate, EDB) . Other usable compounds include, for example, hydrogen, electron/proton or electron donors, β‐allyl sulfones, cleavable ketones (e.g.…”

Section: Introductionmentioning

confidence: 99%

A low migration phosphine to overcome the oxygen inhibition in new high performance photoinitiating systems for photocurable dental type resins

Bouzrati-Zerelli

Maier²,

Fik³

et al. 2016

Polymer International

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The objective of this work was to propose a novel low migration additive (i.e. a phosphine) to overcome the oxygen inhibition in a camphorquinone (CQ) base photoinitiating system for the polymerization of methacrylates (e.g. a bisphenol A‐glycidyl methacrylate (Bis‐GMA)/triethyleneglycol dimethacrylate (TEGDMA) blend (70%/30% w/w)) upon exposure to a commercial blue light emitting diode centred at 477 nm. CQ/amine/phosphine derivative or CQ/amine/iodonium salt/phosphine derivative combinations were studied. Real‐time Fourier transform IR and photo‐DSC experiments were used to monitor the polymerization profiles. Remarkably, it was found that the addition of the new phosphine derivative to CQ/amine or CQ/amine/iodonium salt noticeably improved the rate of polymerization and the final conversion in air. A low migration was found for this additive as shown by HPLC experiments in agreement with a copolymerizable behaviour. No additional yellowing of the film was observed. Electron spin resonance spectrometry was used to detect the produced radicals. The overall chemical mechanisms are investigated and discussed. © 2016 Society of Chemical Industry

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A comparison of efficiency of two photoinitiators for polymerization of light‐cure dental composite resins

Cited by 12 publications

References 47 publications

Crosslinking behavior of dextran modified with hydroxyethyl methacrylate upon irradiation with visible light—Effect of concentration, coinitiator type, and solvent

Crosslinking behavior of dextran modified with hydroxyethyl methacrylate upon irradiation with visible light—Effect of concentration, coinitiator type, and solvent

Efficiency of 2,2‐dimethoxy‐2‐phenylacetophenone for the photopolymerization of methacrylate monomers in thick sections

A low migration phosphine to overcome the oxygen inhibition in new high performance photoinitiating systems for photocurable dental type resins

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