Increased rates of photopolymerisation by ternary type II photoinitiator systems in dental resins

Lima, Adriano Fonseca; Salvador, Marcos Vinicius Oliveira; Dressano, Diogo; Saraceni, Cíntia Helena Coury; Gonçalves, Luciano de Souza; Hadis, Mohammed; Palin, William M.

doi:10.1016/j.jmbbm.2019.06.005

Cited by 45 publications

(36 citation statements)

References 35 publications

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“…This makes the photopolymerization process initiated by the ternary initiation system extremely efficient and fast. A similar degree of conversion and rate of polymerization compared to acylphosphine oxide (MAPO) or bis-acylphosphine oxide (BAPO) photoinitiators is even obtained [201][202][203].…”

Section: Two-or Three-component Photoinitiating Systems Containing Iomentioning

confidence: 86%

“…The photoinitiating system based on CQ/iodonium salt or CQ/iodonium salt/amine have mainly found application in initiating traditional methacrylate monomers used in the production of dental composites [201,202,[204][205][206][207]. The addition of iodonium salt to the photoinitiating systems used to prepare dental composites brings many benefits.…”

Section: Two-or Three-component Photoinitiating Systems Containing Iomentioning

confidence: 99%

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Moving Towards a Finer Way of Light-Cured Resin-Based Restorative Dental Materials: Recent Advances in Photoinitiating Systems Based on Iodonium Salts

Topa

Ortyl

2020

Materials

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The photoinduced polymerization of monomers is currently an essential tool in various industries. The photopolymerization process plays an increasingly important role in biomedical applications. It is especially used in the production of dental composites. It also exhibits unique properties, such as a short time of polymerization of composites (up to a few seconds), low energy consumption, and spatial resolution (polymerization only in irradiated areas). This paper describes a short overview of the history and classification of different typical monomers and photoinitiating systems such as bimolecular photoinitiator system containing camphorquinone and aromatic amine, 1-phenyl-1,2-propanedione, phosphine derivatives, germanium derivatives, hexaarylbiimidazole derivatives, silane-based derivatives and thioxanthone derivatives used in the production of dental composites with their limitations and disadvantages. Moreover, this article represents the challenges faced when using the latest inventions in the field of dental materials, with a particular focus on photoinitiating systems based on iodonium salts. The beneficial properties of dental composites cured using initiation systems based on iodonium salts have been demonstrated.

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Section: Two-or Three-component Photoinitiating Systems Containing Iomentioning

confidence: 86%

Section: Two-or Three-component Photoinitiating Systems Containing Iomentioning

confidence: 99%

Moving Towards a Finer Way of Light-Cured Resin-Based Restorative Dental Materials: Recent Advances in Photoinitiating Systems Based on Iodonium Salts

Topa

Ortyl

2020

Materials

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“…This affects the activation of alternative initiators present in the resin material, even though some of these alternative photoinitiators such as MAPO and BAPO present a significantly higher quantum yield compared to CQ. [15] Therefore, owing to the reduction of the violet light, the activation of alternative photoinitiators will be compromised when the ceramic is thicker than 1 mm. This can affect the mechanical properties of the resin cement.…”

Section: Discussionmentioning

confidence: 99%

“…The CQ initiates the polymerization after it reacts with a co-initiator. [14,15] However, since CQ is yellow, alternative initiator systems have been studied and used in an effort to improve the polymerization process. [10,[16][17][18][19] Although CQ has a yellow appearance, the yellow appearance in resins with the cited photosensitizer reduces after curing and over time.…”

Section: Introductionmentioning

confidence: 99%

“…[10,[16][17][18][19] Although CQ has a yellow appearance, the yellow appearance in resins with the cited photosensitizer reduces after curing and over time. [14] While the results on the rate of polymerization and the degree of conversion are promising [15,18,20], the new initiator systems require a shorter wavelength of light in the violet region compared to the blue light used for CQ-containing materials. [10,18] Thus, to polymerize materials containing other initiators (mono-acyl phosphine oxide-MAPO, bisacyl phosphine oxide-BAPO), clinicians must use a broad-spectrum LCU that emits both blue and violet wavelengths of light.…”

Section: Introductionmentioning

confidence: 99%

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Transmission of violet and blue light and current light units through glass-reinforced ceramics with different thicknesses

Lima

2021

J Prosthodont Res

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Purpose: To evaluate the effect of glass-reinforced ceramics (leucite and lithium disilicate) with different thicknesses (1, 2, and 3 mm) on the wavelength and irradiance spectrum of blue and violet lights. In addition, the effect of the ceramics on four current light-curing units (LCUs) was evaluated: a halogen lamp, a single peak LED, and two multi-peak LEDs. Methods: Ceramic discs of different thicknesses (1, 2, and 3 mm) were obtained from computer-aided design and computer-aided manufacturing (CAD-CAM) blocks. The irradiance, radiant exposure, and emission spectrum of the four LCUs were analyzed using a spectrometer-based instrument. To evaluate the violet and blue lights, a specific device that provides a narrow emission spectrum was used. Results: The ceramics reduced the irradiance of all the tested LCUs. However, the wavelength of the transmitted light was only altered slightly. The effect of leucite and lithium disilicate varied according to the type of LCU and thickness of the ceramic disc evaluated. Conclusions: From the results, it could be concluded that the thickness of the leucite and lithium disilicate ceramic significantly reduced the irradiance of the light emitted by the LCUs, with minimal changes on the wavelength spectrum of the lights. The effects of the ceramic on irradiance and transmitted wavelengths of the blue and violet lights was slightly different.

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Synthesis and properties of acyldiphenylphosphine oxides photoinitiators carrying triphenylamine or pyrene group for free radical photopolymerization

Luo

2023

J of Applied Polymer Sci

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Two new photoinitiators of acyldiphenylphosphine oxides carrying triphenylamine (NHPO) or pyrene group (BHPO) were designed and synthesized with diphenylphosphine oxide reacting with 4‐(diphenylamino) benzaldehyde or 1‐pyrenecarboxaldehyde. The solubility of NHPO is about 13.7 wt% in TMPTA, which is higher than that of (2,4,6‐trimethylbenzoyl) diphenylphosphine oxide (TPO) (about 12.5 wt%). The UV–Vis spectrum of NHPO and BHPO revealed that their maximum absorption wavelengths have redshifted to 397 and 419 nm, respectively, with a molar extinction coefficient of around 19,057 and 24,257 M−1 cm−1, suggesting that they are likely to be effective photoinitiators when exposed to light from LEDs. According to real‐time Fourier transform infrared spectroscopies, the degree of double bond conversion of NHPO reached 65%, which was higher than that of TPO (about 45%), showing that NHPO had substantially better photoinitiated properties than TPO. Using steady‐state photolysis and electron spin resonance spin‐trapping studies, the photocuring mechanism was examined, and it was discovered that the NHPO and BHPO had produced two free radicals. Additionally, NHPO exhibited superior biocompatibility performance as demonstrated by cytotoxicity assays and had a low migration rate of only 0.23%, as determined by migration. As a result, NHPO might be utilized in coatings for food packaging.

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Increased rates of photopolymerisation by ternary type II photoinitiator systems in dental resins

Cited by 45 publications

References 35 publications

Moving Towards a Finer Way of Light-Cured Resin-Based Restorative Dental Materials: Recent Advances in Photoinitiating Systems Based on Iodonium Salts

Moving Towards a Finer Way of Light-Cured Resin-Based Restorative Dental Materials: Recent Advances in Photoinitiating Systems Based on Iodonium Salts

Transmission of violet and blue light and current light units through glass-reinforced ceramics with different thicknesses

Synthesis and properties of acyldiphenylphosphine oxides photoinitiators carrying triphenylamine or pyrene group for free radical photopolymerization

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