A reappraisal of the photopolymerization kinetics of triethyleneglycol dimethacrylate initiated by camphorquinone-N,N-dimethyl-p-toluidine for dental purposes

Nie, Jun; Lindén, Lars‐Åke; Rabek, Jan F.; Fouassier, Jean Pierre; Morlet‐Savary, Fabrice; Ścigalski, Franciszek; Wrzyszczyński, Andrzej; Andrzejewska, Ewa

doi:10.1002/(sici)1521-4044(199804)49:4<145::aid-apol145>3.0.co;2-d

Cited by 68 publications

(31 citation statements)

References 33 publications

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“…Non-converted double carbon links could make the material more susceptible to degradation j o u r n a l o f d e n t i s t r y 3 9 s ( 2 0 1 1 ) e 2 5 -e 2 9 reactions, 5 resulting in the reduction of color stability and in the release of products such as formaldehyde and methacrylic acid. 6 Many laboratorial and clinical studies have indicated that there is a relation between degree of conversion and the properties of the composite resins; 7 however, the degree of conversion on these properties could be dissimulated by other factors, such as the size, shape, and distribution of the inorganic fillers. 8 The cure temperature has a significant effect on the values of degree of conversion of commercial composite resins, 9 thereby affecting the properties of the polymer.…”

Section: Introductionmentioning

confidence: 99%

Color stability, opacity and degree of conversion of pre-heated composites

Mundim

Garcia

Cruvinel

et al. 2011

Journal of Dentistry

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Section: Introductionmentioning

confidence: 99%

Color stability, opacity and degree of conversion of pre-heated composites

Mundim

Garcia

Cruvinel

et al. 2011

Journal of Dentistry

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“…[3][4][5] This compound is relatively inefficient in forming radicals and requires an accelerator (typically an aliphatic amine, such as DMAEMA) so that exposure durations, which are practical to the clinician and patient, can occur. 6 CQ-based systems worked well for color shades that do not involve the high values required when restoring bleached teeth. 7 CQ is bright, canary yellow in color and, even though it is added in only small amounts, it significantly contributes to the presence of a yellowish tinge in the final restoration.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Light Curing Source on the Residual Yellowing of Resin Composites

Brackett¹,

Brackett²,

Browning³

2007

Operative Dentistry

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Laboratory Research SUMMARYPurpose. This study evaluated the amount of residual yellow in cured resin composites when polymerizing with either a quartz-tungsten-halogen (QTH) or blue light-emitting diode (LED). Material and Methods: Twelve shades (bleaching to conventional shades) of microfill, hybrid and microhybrid resin composite specimens (n=10) were polymerized with both light types. All the materials contained only camphorquinone as the photoinitiator. After exposure, the specimens were stored in the dark for 24 hours. Then, the specimen color parameters were recorded (L*, a*, b* and C* ab ) and color differences (ΔE* ab ) were determined by examining for changes among the test combinations. Group comparisons were examined using ANOVA and the Tukey-Kramer post-hoc test, and pairwise comparisons were made using Student's t-tests at a pre-set alpha of 0.05. Results: When a significant difference in residual yellow was noted, the QTH light produced a greater yellow tinge than most comparisons using the LED. The potential for producing more residual yellowing could not be anticipated with respect to composite filler classification or shade, as this effect may be more dependent on individual product composition. The extent to which residual yellowing differences were noted between light curing unit types fell within levels considered detectable by the human eye (ΔE>2.0). Clinical RelevanceThe selection of light curing unit (quartz-tungsten-halogen or blue light-emitting diode), composite classification and shade have an influence on the amount of residual yellow after photocuring and, in some combinations, the color difference may be visually detectable.

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“…[8][9][10][11] However, in a very recent study, Rabek et al suggested that in CQ-amine systems photogeneration of free radicals occurs through a sequence of electron-proton transfer processes. [12] In this paper, it is our intention to demonstrate that a pure CQ-electron donor photoredox pair might be a very inefficient photoinitiating system in comparison to a very similar pair, in which a photoinduced hydrogen-atom-transfer process can occur.…”

Section: Introductionmentioning

confidence: 99%

Reinvestigation of the Mechanism of the Free Radical Polymerization Photoinitiation Process by Camphorquinone–Coinitiator Systems: New Results

Pyszka

Kucybała²,

Pączkowski

2004

Macro Chemistry & Physics

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Summary: Comparative studies of photoinitiation processes using camphorquinone (CQ) and benzophenone (BP) as light absorbers were performed. The experimental results show that after the transformation of (phenylthio)acetic acid (PTAA) into its tetrabutylammonium salt (PTAA AS), a substantial decrease of the polymerization photoinitiation ability for the CQ–PTAA AS pair in comparison to the CQ–PTAA pair is observed. The mechanism of the photoinitiated polymerization for the tested photoredox pair was clarified based on laser flash photolysis experiments obtained using benzophenone as an electron acceptor and (phenylthio)acetic acid and its tetrabutylammonium salt as electron donors in solution in MeCN. It is documented and deduced that the photoreduction of benzophenone in the presence of (phenylthio)acetic acid and its tetrabutylammonium salt occurs by a photoinduced electron transfer process, while for CQ as initiator, the free radicals are formed by hydrogen atom abstraction by the triplet state of camphorquinone.Schematic of the transients formed after an electron‐transfer process for benzophenone–PTAA and benzophenone–PTAA AS pairs.magnified imageSchematic of the transients formed after an electron‐transfer process for benzophenone–PTAA and benzophenone–PTAA AS pairs.

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A reappraisal of the photopolymerization kinetics of triethyleneglycol dimethacrylate initiated by camphorquinone-N,N-dimethyl-p-toluidine for dental purposes

Cited by 68 publications

References 33 publications

Color stability, opacity and degree of conversion of pre-heated composites

Color stability, opacity and degree of conversion of pre-heated composites

The Effect of Light Curing Source on the Residual Yellowing of Resin Composites

Reinvestigation of the Mechanism of the Free Radical Polymerization Photoinitiation Process by Camphorquinone–Coinitiator Systems: New Results

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