Analysis of camphorquinone in composite resins as a function of shade

Alvim, Hugo Henriques; Alécio, Alberto Camilo; Vasconcellos, Walison Arthuso; Furlan, Maysa; Oliveira, José Eduardo de; Saad, José Roberto Cury

doi:10.1016/j.dental.2006.11.002

Cited by 97 publications

(86 citation statements)

References 17 publications

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“…CQ concentration of 0.1 wt% was chosen for the present study because it is in accordance with findings of previous studies [2,25]. However, the other photoinitiators tested showed different molecular masses (Table 1).…”

Section: Discussionsupporting

confidence: 62%

“…Unfortunately, it has some undesirable properties, such as the yellowing effect due to incorporation and also its need for a tertiary amine, which may cause future material discoloration [2]. These factors have stimulated researches to find new photoinitiator agents with better properties like PPD, Lucirin ® TPO and Irgacure ® 819.…”

Section: Discussionmentioning

confidence: 99%

“…The most popular photoinitiator among dental polymers is camphorquinone (CQ) [2,10,[20][21][22][23][24][25][26][27]. CQ has good absorption within the visible region of the light spectrum, with wavelength peak of 470 nm [10].…”

Section: Discussionmentioning

confidence: 99%

“…These materials are essentially composed of two phases: an organic resinous matrix, comprising dimethacrylate monomers, photoinitiator and other minor additives and an inorganic phase, known as filler, generally composed of Barium aluminum silicate particulate glass and pyrogenic silica normally surface modified by a coupling agent aiming to improve the mechanical properties after polymerization [2].…”

Section: Introductionmentioning

confidence: 99%

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Influence of Different Photoinitiators on Polymerization Kinetics and Marginal Microleakage in Restorations using Photopolymerizable Dental Composites

Alvim

Campos

Vasconcellos

et al. 2017

Pesqui. bras. odontopediatria clín. integr.

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Objective: To evaluate the influence of four different photoinitiators on the polymerization kinetics and marginal microleakage in class V restorations using photopolymerizable dental composites. Material and Methods: Four photopolymerizable dental composites based on Bis-GMA (14.5 wt %), UDMA (6.5 wt %) and silanized filler particles (79 wt %) containing different photoinitiators were formulated. Camphorquinone (CQ)/amine, phenyl-propanedione (PPD), monoacylphosphine oxide (Lucirin ® TPO) and bisacylphosphine oxide (Irgacure ® 819) were used as photoinitiators. Sixteen intact human third molars were selected and divided into four groups. All teeth received class V cavity preparations in their buccal and lingual surfaces and were submitted to a dye leakage test. Data were independently analyzed for both enamel and dentin, and the results were assessed by a Kruskal-Walis test. The polymerization reactions of the four composites were evaluated by differential scanning calorimeter coupled with photocalorimeter accessory. Results: Lucirin ® TPO presented the highest scores for microleakage in enamel, whereas the other photoinitiators have not demonstrated statistical differences. The lowest scores were obtained for PPD in dentin while the highest scores have been achieved by Irgacure ® 819 and Lucirin ® TPO. Photocalorimetric measurements demonstrated a correlation between polymerization reaction rate and marginal leakage, showing that faster reactions cause greater marginal leakage. Conclusion: Marginal microleakage scores in photopolymerizable dental composites can be greatly influenced by different types of photoinitiators through their distinct reaction rates.

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Section: Discussionsupporting

confidence: 62%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of Different Photoinitiators on Polymerization Kinetics and Marginal Microleakage in Restorations using Photopolymerizable Dental Composites

Alvim

Campos

Vasconcellos

et al. 2017

Pesqui. bras. odontopediatria clín. integr.

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“…Initiators added to these dimethacrylate monomers mixtures initiate polymerization under a light source producing radicals. In the peculiar case of camphorquinone initiator, co-catalysts such as amines are needed to perform the polymerization [5][6][7]. Organic resins are more often filled (>80w.%) with different types of inorganic fillers like silica, borosilicate glasses, and strontium glasses to improve the resistance of the final composite (rigidity, hardness…).…”

Section: Introductionmentioning

confidence: 99%

Observation of oxygen inhibited layer of organic dental resin by confocal Raman-microscopy

et al. 2012

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Abstract:This study investigated degrees of conversion of oxygen inhibited layer (OIL) of organic dental resins for restoration using Confocal-Raman spectroscopy. The aim was to determine which laser is adapted to determine the degrees of conversion of OIL and to measure variations of thickness and degrees of conversion in OIL with respect to monomers proportions. Bis-GMA (bis-phenol A glycidyl dimethacrylate) and TEGDMA (triethylene glycol dimethacrylate) based resins with various ratio of an equimolecular mixture of camphorquinone/EDMAB (ethyl (4-dimethyl amino) benzoate) were studied with different lasers by confocalRaman spectroscopy. Results show that this technique is adapted for the non destructive measurement of OIL. The Thickness of OIL is not correlated with the proportions of Bis-GMA and TEGDMA in the resin and was close to 3-4µm. Thickness of OIL is very thin without inorganic fillers (3 or 4 µm). Inorganic fillers might be responsible of greater OIL in composite resins.

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Polydopamine as a Visible‐Light Photosensitiser for Photoinitiated Polymerisation

et al. 2023

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Polydopamine (PDA) is a synthetic model for melanin and has a wide range of opto-electronic properties that underpin its utility in applied and biological settings, from broadband light absorbance to possessing stable free radical species. Here, we show that PDA free radicals are photo-responsive under visible light irradiation, enabling PDA to serve as a photo-redox catalyst. Steady-state and transient electron spin resonance spectroscopy reveals a reversible amplification in semiquinone radical population within PDA under visible light. This photo-response modifies the redox potential of PDA and supports sensitisation of exogenous species via photoinduced electron transfer (PET). We demonstrate the utility of this discovery by employing PDA nanoparticles to photosensitise a common diaryliodonium photoinitiator and initiate free-radical polymerisation (FRP) of vinylic monomers. In situ 1 H nuclear magnetic resonance spectroscopy reveals an interplay between PDA-driven photosensitising and radical quenching during FRP under blue, green, and red light. This work provides crucial insights into the photoactive free radical properties of melanin-like materials and reveals a promising new application for polydopamine as a photosensitiser.

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Analysis of camphorquinone in composite resins as a function of shade

Cited by 97 publications

References 17 publications

Influence of Different Photoinitiators on Polymerization Kinetics and Marginal Microleakage in Restorations using Photopolymerizable Dental Composites

Influence of Different Photoinitiators on Polymerization Kinetics and Marginal Microleakage in Restorations using Photopolymerizable Dental Composites

Observation of oxygen inhibited layer of organic dental resin by confocal Raman-microscopy

Polydopamine as a Visible‐Light Photosensitiser for Photoinitiated Polymerisation

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