Development of a new photoinitiation system for dental light-cure composite resins

Park, Kyung Hee; Chae, Kyu Ho; Rawls, H. Ralph

doi:10.1016/s0109-5641(99)00021-4

Cited by 219 publications

(219 citation statements)

References 24 publications

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“…CQ is a chiral bicyclic 2,3-dione (see Fig. 1) and is widely used as photosensitizer for dental resin composites [20], or as photo-initiator for lightcure resin compositions [21,22] due to its photochemical reactivity upon excitation in the 400-500 nm range [23]. So far, its liquid-state room temperature phosphorescence spectra have been reported for nonpolar solvents as methylcyclohexane but not yet for aqueous CD solutions [24]; in aqueous solvents phosphorescence is hardly visible [18].…”

Section: Introductionmentioning

confidence: 99%

Enantioselective detection of chiral phosphorescent analytes in cyclodextrin complexes

García-Ruiz

Scholtes

Ariese

et al. 2005

Talanta

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Inclusion complexes between camphorquinone (CQ) and cyclodextrins (CDs) in deoxygenated aqueous solutions are shown to exhibit relatively strong room temperature phosphorescence (RTP). Among the various CDs tested, ␣-CD showed the strongest RTP signals. Interestingly, these signals differed significantly for the two enantiomers of CQ; the phosphorescence lifetime of (+)-CQ was about four times longer than that of (−)-CQ, being 352 ± 16 and 89 ± 6 s, respectively. This enantiomeric selectivity is attributed to a difference in dissociation rates (competing with the radiative emission process) for the diastereoisomeric inclusion complexes dealt with, which have a 2:1 stoichiometry (␣-CD:CQ:␣-CD). Time-resolved RTP detection using different delay times enables the determination of the two enantiomers in a mixture without involving a separation technique. The minimum detectable fraction of (+)-CQ in a 2 mM sample was 13%.

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Section: Introductionmentioning

confidence: 99%

Enantioselective detection of chiral phosphorescent analytes in cyclodextrin complexes

García-Ruiz

Scholtes

Ariese

et al. 2005

Talanta

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“…CQ operates predominantly by proton abstraction of the amine hydrogen, whereas PPD can undergo photocleavage and proton abstraction, which forms free radicals more efficiently. 9 Apparently, this had no effect on polymerization stress in this study, because PPD composites and CQ composites generated similar stress values. Thus, it appears that both photoinitiators were able to promote double link conversion; although PPD reduced the reaction velocity, this did not decrease total composite polymerization shrinkage.…”

Section: Discussionmentioning

confidence: 63%

“…This result is inconsistent with a previous study reporting a synergistic effect between CQ and PPD, suggesting that one could expect more efficient use of photon energy. 9 Not all polymerization shrinkage occurs immediately after light activation. 20 Our results showed that stress increased at 24 hours and remained constant at 7 days for all composites except Silorane.…”

Section: Discussionmentioning

confidence: 99%

“…8 1-Phenyl-1,2-propanedione (PPD) has been suggested as a possible CQ substitute, with the potential to reduce discoloration and improve the aesthetic properties of composites. 9 Generally, PPD-containing composites attain maximum polymerization values more slowly than those with CQ, because the polymerization rate and degree of conversion depend on the absorbed power density. 10 The aim of this study was to use photoelastic analysis to evaluate polymerization shrinkage stress.…”

Section: Introductionmentioning

confidence: 99%

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Photoelastic evaluation of the effect of composite formulation on polymerization shrinkage stress

et al. 2012

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We compared polymerization stress in two commercial composites and three experimental composites made using camphorquinone (CQ) and/or phenylpropanedione (PPD) as photoinitiators. The internal surfaces of photoelastic resin discs with cylindrical cavities were roughened and treated with adhesive. Composites were divided into five groups: two commercial composites (Filtek Silorane and Filtek Z250) and three experimental composites with CQ/amine, CQ/PPD/amine, and PPD/amine. Composites were photopolymerized inside cavities, and subjected to photoelastic analysis immediately and at 24 hours and 7 days later using a plane polariscope. Stress created by Silorane (3.08 ± 0.09 MPa) was similar to that of Z250 (3.19 ± 0.13 MPa) immediately after photopolymerization (p > 0.05). After 24 hours and 7 days, Z250 (3.53 ± 0.15 and 3.69 ± 0.10 MPa, respectively) showed higher stress than Silorane (3.19 ± 0.10 and 3.16 ± 0.10 MPa, respectively). Qualitative analysis immediately after photopolymerization showed composite/CQ promoted higher stress than PPD, but stress levels at other evaluated times were statistically similar, varying between 3.45 ± 0.11 MPa and 3.92 ± 0.13 MPa. At 24 hours and 7 days, Silorane created the lowest stress. All photoinitiators created comparable tensions during polymerization.

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“…The photo-initiator phenyl propadione (PPD) has an absorption peak of 420 nm 18 , which means that LEDs are not able to start polymerization of composite resins and adhesive systems that contain this photo-initiator.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the microtensile bond strength to enamel of two adhesive systems polymerized by halogen light or LED

Carvalho

Turbino

2005

Braz. oral res.

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ABSTRACT:With the development of composite resin polymerization techniques, LEDs were introduced to the market place. Based on the studied literature, the aim of this study was to evaluate, through microtensile testing, the bond strength to enamel of a composite resin associated to a conventional (multi-bottle) adhesive system or to a self etching primer adhesive system, polymerized by halogen light or LED (light emitting diode). Bovine teeth were divided into 4 groups with 10 teeth each (n = 10). Then the adhesives Scotchbond Multipurpose Plus (3M-ESPE) and Clearfil SE Bond (Kuraray) were applied following the manufacturers' instructions. Both systems were polymerized for 10 s by halogen light (Degulux Soft Start -Degussa Hulls) set at 550 mW/cm 2 or by LED (Kerr Demetron) set at 600 mW/cm 2 . The composite resin Filtek Z-250 was applied in four 1 mm increments with the aid of a square, condensation silicon, 5 mm x 5 mm matrix, and polymerized by either of light sources for 40 s. Scotchbond Multipurpose Plus polymerized by halogen light presented the highest bond strength values (39.69 ± 7.07 MPa), and the other groups did not present statistically significant differences: Scotchbond Multipurpose Plus polymerized by LED (22.28 ± 2.63 MPa), Clearfil SE Bond polymerized by halogen light (27.82 ± 2.65 MPa) and by LED (22.89 ± 5.09 MPa). DESCRIPTORS: Adhesives; Dental bonding; Polymerization; Light-emitting diode (LED). RESUMO:Com a grande busca pelo desenvolvimento das técnicas de polimerização das resinas compostas e dos sistemas adesivos, foram introduzidos no mercado os LEDs. Com base na literatura estudada, neste trabalho é avaliada a força de união da resina composta ao esmalte associado a um sistema adesivo convencional e a um sistema autocondicionante polimerizados por luz halógena e LED, por meio do teste de microtração. Os dentes bovinos foram divididos em 4 grupos com 10 dentes em cada um (n = 10), para aplicação do adesivo Scotchbond Multipurpose Plus (3M-ESPE) e do Clearfil SE Bond (Kuraray) conforme orientação do fabricante, ambos polimerizados por 10 s tanto pela luz halógena (Degulux Soft Start -Degussa Hulls) com potência de 550 mW/cm 2 como pelo LED (Kerr Demetron) com potência de 600 mW/cm 2 . A resina composta Filtek Z-250 foi aplicada em 4 incrementos de 1 mm com auxílio de uma matriz de silicona de condensação de formato quadrado com dimensões de 5 mm x 5 mm; sendo polimerizada tanto pela luz halógena como pelo LED por 40 s. O adesivo Scotchbond Multipurpose Plus polimerizado com luz halógena apresentou os maiores valores de adesão (39,69 ± 7,07 MPa) e os outros grupos não apresentaram diferença estatisticamente significante entre si: Scotchbond Multipurpose Plus polimerizado por LED (22,28 ± 2,63 MPa), Clearfil SE Bond polimerizado por luz halógena (27,82 ± 2,65 MPa) e por LED (22,89 ± 5,09 MPa).

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Development of a new photoinitiation system for dental light-cure composite resins

Cited by 219 publications

References 24 publications

Enantioselective detection of chiral phosphorescent analytes in cyclodextrin complexes

Enantioselective detection of chiral phosphorescent analytes in cyclodextrin complexes

Photoelastic evaluation of the effect of composite formulation on polymerization shrinkage stress

Analysis of the microtensile bond strength to enamel of two adhesive systems polymerized by halogen light or LED

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