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André CB, Dos Santos A, Pfeifer CS, Giannini M, Girotto EM, Ferracane JL. Evaluation of three different decontamination techniques on biofilm formation, and on physical and chemical properties of resin composites. J Biomed Mater Res B Appl Biomater 2017; 106:945-953. [PMID: 28440891 DOI: 10.1002/jbm.b.33907] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2016] [Revised: 03/27/2017] [Accepted: 04/13/2017] [Indexed: 12/29/2022]
Abstract
OBJECTIVES This study evaluated three different sterilization/disinfection techniques for resin composites on bacterial growth and surface modification after decontamination. METHODS Two resin composites were sterilized/disinfected with three different techniques: UV light, 1% chloramine T, and 70% ethanol. Four different times were used for each technique to determine the shortest time that the solution or UV light was effective. The influence of sterilization/disinfection technique on bacterial growth was evaluated by analyzing the metabolic activity, using the AlamarBlue™ assay, bacterial viability, and SEM images from biofilms of Streptococcus mutans. The surface change, after the process, was analyzed with ATR/FTIR and SEM images. The solutions used for decontamination (1% chloramine-T and 70% ethanol) were analyzed with 1 H-NMR to identify any resin compounds leached during the process. RESULTS One minute of decontamination was efficient for all three methods tested. Chloramine-T increased the surface porosity on resin composites, no changes were observed for UV light and 70% ethanol, however, 1 H-NMR identified leached monomers only when 70% ethanol was used. No chemical change of the materials was found under ATR/FTIR analyses after the decontamination process. Chloramine-T, with no previous wash, increased the bacterial viability for both resin composites and increased the bacterial metabolism for the resin composite without fluoride. CONCLUSION UV light had no interference on the resin composites properties tested using 1 min of exposure compared to the other decontamination methods. © 2017 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 106B: 945-953, 2018.
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Affiliation(s)
- Carolina Bosso André
- Department of Restorative Dentistry, Piracicaba Dental School, University of Campinas, Campinas, Brazil
| | - Andressa Dos Santos
- Department of Chemistry, School of Chemistry, State University of Maringá, Maringá, Brazil
| | - Carmem Silvia Pfeifer
- Department of Dental Materials, School of Dentistry, Oregon Health and Science University, Portland, Oregon
| | - Marcelo Giannini
- Department of Restorative Dentistry, Piracicaba Dental School, University of Campinas, Campinas, Brazil
| | | | - Jack Liborio Ferracane
- Department of Dental Materials, School of Dentistry, Oregon Health and Science University, Portland, Oregon
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Desmet CM, Levêque P, Gallez B. Factors Affecting the Quality of Tooth Enamel for In Vivo EPR-Based Retrospective Biodosimetry. RADIATION PROTECTION DOSIMETRY 2016; 172:96-102. [PMID: 27473693 PMCID: PMC5225974 DOI: 10.1093/rpd/ncw212] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
In vivo electron paramagnetic resonance biodosimetry on tooth enamel is likely to be an important technology for triage of overexposed individuals after a major radiological incident. The accuracy and robustness of the technique relies on various properties of the enamel such as the geometry of the tooth, the presence of restorations, whitening treatments or exposition to sunlight. Those factors are reviewed, and their influence on dosimetry specifically for triage purposes is discussed.
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Affiliation(s)
- Céline M Desmet
- Biomedical Magnetic Resonance Research Group, Louvain Drug Research Institute, Université Catholique de Louvain, Avenue Mounier 73 - B1.73.08, B-1200 Brussels, Belgium
| | - Philippe Levêque
- Biomedical Magnetic Resonance Research Group, Louvain Drug Research Institute, Université Catholique de Louvain, Avenue Mounier 73 - B1.73.08, B-1200 Brussels, Belgium
| | - Bernard Gallez
- Biomedical Magnetic Resonance Research Group, Louvain Drug Research Institute, Université Catholique de Louvain, Avenue Mounier 73 - B1.73.08, B-1200 Brussels, Belgium
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Desmet CM, Djurkin A, Dos Santos-Goncalvez AM, Dong R, Kmiec MM, Kobayashi K, Rychert K, Beun S, Leprince JG, Leloup G, Levêque P, Gallez B. Tooth Retrospective Dosimetry Using Electron Paramagnetic Resonance: Influence of Irradiated Dental Composites. PLoS One 2015; 10:e0131913. [PMID: 26125565 PMCID: PMC4488324 DOI: 10.1371/journal.pone.0131913] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2015] [Accepted: 06/08/2015] [Indexed: 11/25/2022] Open
Abstract
In the aftermath of a major radiological accident, the medical management of overexposed individuals will rely on the determination of the dose of ionizing radiations absorbed by the victims. Because people in the general population do not possess conventional dosimeters, after the fact dose reconstruction methods are needed. Free radicals are induced by radiations in the tooth enamel of victims, in direct proportion to dose, and can be quantified using Electron Paramagnetic Resonance (EPR) spectrometry, a technique that was demonstrated to be very appropriate for mass triage. The presence of dimethacrylate based restorations on teeth can interfere with the dosimetric signal from the enamel, as free radicals could also be induced in the various composites used. The aim of the present study was to screen irradiated composites for a possible radiation-induced EPR signal, to characterize it, and evaluate a possible interference with the dosimetric signal of the enamel. We investigated the most common commercial composites, and experimental compositions, for a possible class effect. The effect of the dose was studied between 10 Gy and 100 Gy using high sensitivity X-band spectrometer. The influence of this radiation-induced signal from the composite on the dosimetric signal of the enamel was also investigated using a clinical L-Band EPR spectrometer, specifically developed in the EPR center at Dartmouth College. In X-band, a radiation-induced signal was observed for high doses (25-100 Gy); it was rapidly decaying, and not detected after only 24h post irradiation. At 10 Gy, the signal was in most cases not measurable in the commercial composites tested, with the exception of 3 composites showing a significant intensity. In L-band study, only one irradiated commercial composite influenced significantly the dosimetric signal of the tooth, with an overestimation about 30%. In conclusion, the presence of the radiation-induced signal from dental composites should not significantly influence the dosimetry for early dose assessment.
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Affiliation(s)
- Céline M. Desmet
- Biomedical Magnetic Resonance Research group, Louvain Drug Research Institute, Université catholique de Louvain, Brussels, Belgium
| | - Andrej Djurkin
- School of Dentistry and Stomatology, Université catholique de Louvain, Brussels, Belgium
| | - Ana Maria Dos Santos-Goncalvez
- Advanced Drug Delivery and Biomaterials Research Group, Louvain Drug Research Institute, Université catholique de Louvain, Brussels, Belgium
| | - Ruhong Dong
- EPR Center for the Study of Viable Systems, Geisel School of Medicine at Dartmouth, Hanover, NH, United States of America
| | - Maciej M. Kmiec
- EPR Center for the Study of Viable Systems, Geisel School of Medicine at Dartmouth, Hanover, NH, United States of America
| | - Kyo Kobayashi
- EPR Center for the Study of Viable Systems, Geisel School of Medicine at Dartmouth, Hanover, NH, United States of America
| | - Kevin Rychert
- EPR Center for the Study of Viable Systems, Geisel School of Medicine at Dartmouth, Hanover, NH, United States of America
| | - Sébastien Beun
- School of Dentistry and Stomatology, Université catholique de Louvain, Brussels, Belgium
| | - Julian G. Leprince
- Advanced Drug Delivery and Biomaterials Research Group, Louvain Drug Research Institute, Université catholique de Louvain, Brussels, Belgium
- Center for Research and Engineering on Biomaterials CRIBIO, Université catholique de Louvain, Brussels, Belgium
| | - Gaëtane Leloup
- Advanced Drug Delivery and Biomaterials Research Group, Louvain Drug Research Institute, Université catholique de Louvain, Brussels, Belgium
- Center for Research and Engineering on Biomaterials CRIBIO, Université catholique de Louvain, Brussels, Belgium
| | - Philippe Levêque
- Biomedical Magnetic Resonance Research group, Louvain Drug Research Institute, Université catholique de Louvain, Brussels, Belgium
| | - Bernard Gallez
- Biomedical Magnetic Resonance Research group, Louvain Drug Research Institute, Université catholique de Louvain, Brussels, Belgium
- Center for Research and Engineering on Biomaterials CRIBIO, Université catholique de Louvain, Brussels, Belgium
- * E-mail:
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Randolph LD, Palin WM, Bebelman S, Devaux J, Gallez B, Leloup G, Leprince JG. Ultra-fast light-curing resin composite with increased conversion and reduced monomer elution. Dent Mater 2014; 30:594-604. [PMID: 24679406 DOI: 10.1016/j.dental.2014.02.023] [Citation(s) in RCA: 54] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2013] [Revised: 02/13/2014] [Accepted: 02/25/2014] [Indexed: 12/20/2022]
Abstract
OBJECTIVES To test the null hypotheses that photoactive resin composites containing a Type I photoinitiator would exhibit reduced DC or increased monomer elution at substantially short curing times compared with materials based on a Type 2 ketone/amine system. METHODS Two experimental resin composites were prepared, using either Lucirin-TPO or camphorquinone/DMAEMA. Specimens were light-cured using appropriate spectral emission that coincided with the absorption properties of each initiator using different irradiation protocols (0.5, 1, 3, 9s at 500, 1000 and 2000mW/cm(2) for Lucirin-TPO based composites and 20 or 40s at 1000mW/cm(2) for Lucirin-TPO and camphorquinone-based composites). Degree of conversion (DC) was measured by Raman spectroscopy, propagating radical concentrations were collected by means of electron paramagnetic resonance (EPR) and monomer leaching was characterized using high-performance liquid chromatography (HPLC). RESULTS The null hypotheses were rejected, except for a single irradiation protocol (0.5s @ 500mW/cm(2)). Lucirin-TPO-based composites could cure 20 times faster and release at least 4 times less monomers in comparison to camphorquinone-based composites. At 1000mW/cm(2), and 1s irradiation time for curing times of 1s, Lucirin-TPO based composites displayed 10% higher DC. The difference in polymerization efficiency of Lucirin-TPO compared with camphorquinone-based resin composites were explained using EPR; the former showing a significantly greater yield of radicals which varied logarithmically with radiant exposure. SIGNIFICANCE Lucirin-TPO is substantially more efficient at absorbing and converting photon energy when using a curing-light with an appropriate spectral emission and otherwise a limitation noted in several previous publications. At concentrations of 0.0134mol/L, Lucirin-TPO-based composites require a minimum light intensity of 1000mW/cm(2) and an exposure time of 1s to provide significantly improved DC and minimal elution compared with a conventional photoinitiator system. The use of a wide range of curing protocols in the current experiment has realized the significant potential of Lucirin-TPO and its impact for clinical applications, in replacement to materials using camphorquinone.
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Affiliation(s)
- Luc D Randolph
- Louvain Drug Research Institute, Université catholique de Louvain, Brussels, Belgium; Institute of Condensed Matter and Nanosciences, Bio- and Soft- Matter, Université catholique de Louvain, Louvain-la-Neuve, Belgium; CRIBIO (Center for Research and Engineering on Biomaterials), Brussels, Belgium.
| | - William M Palin
- Biomaterials Unit, University of Birmingham, College of Medical and Dental Sciences, School of Dentistry, St Chad's Queensway, Birmingham B4 6NN, UK
| | - Sabine Bebelman
- Institute of Condensed Matter and Nanosciences, Bio- and Soft- Matter, Université catholique de Louvain, Louvain-la-Neuve, Belgium; CRIBIO (Center for Research and Engineering on Biomaterials), Brussels, Belgium
| | - Jacques Devaux
- Institute of Condensed Matter and Nanosciences, Bio- and Soft- Matter, Université catholique de Louvain, Louvain-la-Neuve, Belgium; CRIBIO (Center for Research and Engineering on Biomaterials), Brussels, Belgium
| | - Bernard Gallez
- Louvain Drug Research Institute, Université catholique de Louvain, Brussels, Belgium; CRIBIO (Center for Research and Engineering on Biomaterials), Brussels, Belgium
| | - Gaetane Leloup
- Louvain Drug Research Institute, Université catholique de Louvain, Brussels, Belgium; Institute of Condensed Matter and Nanosciences, Bio- and Soft- Matter, Université catholique de Louvain, Louvain-la-Neuve, Belgium; CRIBIO (Center for Research and Engineering on Biomaterials), Brussels, Belgium; School of Dentistry and Stomatology, Université catholique de Louvain, Brussels, Belgium
| | - Julian G Leprince
- Louvain Drug Research Institute, Université catholique de Louvain, Brussels, Belgium; Institute of Condensed Matter and Nanosciences, Bio- and Soft- Matter, Université catholique de Louvain, Louvain-la-Neuve, Belgium; CRIBIO (Center for Research and Engineering on Biomaterials), Brussels, Belgium; School of Dentistry and Stomatology, Université catholique de Louvain, Brussels, Belgium
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Effect of food/oral-simulating liquids on dynamic mechanical thermal properties of dental nanohybrid light-cured resin composites. Dent Mater 2013; 29:842-50. [DOI: 10.1016/j.dental.2013.04.013] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2012] [Revised: 11/13/2012] [Accepted: 04/25/2013] [Indexed: 11/23/2022]
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Leprince JG, Palin WM, Hadis MA, Devaux J, Leloup G. Progress in dimethacrylate-based dental composite technology and curing efficiency. Dent Mater 2013. [PMID: 23199807 DOI: 10.1016/j.dental.2012.11.005] [Citation(s) in RCA: 324] [Impact Index Per Article: 29.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Julian G Leprince
- School of Dentistry and Stomatology, Université catholique de Louvain, Brussels, Belgium.
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Dental resin curing blue light induced oxidative stress with reactive oxygen species production. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2012; 114:73-8. [DOI: 10.1016/j.jphotobiol.2012.05.012] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2012] [Revised: 05/11/2012] [Accepted: 05/15/2012] [Indexed: 01/17/2023]
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Levêque P, Leprince JG, Bebelman S, Devaux J, Leloup G, Gallez B. Spectral spatial electron paramagnetic resonance imaging as a tool to study photoactive dimethacrylate-based dental resins. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2012; 220:45-53. [PMID: 22683580 DOI: 10.1016/j.jmr.2012.04.014] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2012] [Revised: 04/20/2012] [Accepted: 04/23/2012] [Indexed: 06/01/2023]
Abstract
Photopolymerizable dimethacrylate-based dental resins, which are widely used in the current routine dental practice, show a very strong EPR signal. This signal has already been studied by EPR spectroscopy, but not by EPR imaging. The spectrum is quite complex due to hyperfine splitting and to the presence of two radical species, which is a priori not favorable to EPR imaging. In this work, the robustness of EPR imaging was investigated, both in the spatial and spectral-spatial modes, to characterize this type of material using small resin samples. The images produced using standard deconvolution and filtered backprojection procedure did not display any noticeable artifact. They also reflected the expected density of free radicals in two types of resin, photopolymerized with two different light irradiances. Moreover, the spectral-spatial imaging mode provided a complete spectrum for each pixel, which enabled to delineate the different distributions of the two radical species inside the samples. EPR imaging offered a different information compared to the usual degree of conversion measured by Raman spectrometry. These results suggest that EPR imaging could be used as a complementary tool to further characterize the dimethacrylate-based resins used in dental practice or for other applications.
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Affiliation(s)
- Philippe Levêque
- Biomedical Magnetic Resonance Research Group, Louvain Drug Research Institute, Université catholique de Louvain, Brussels, Belgium
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Leprince JG, Zeitlin BD, Tolar M, Peters OA. Interactions between immune system and mesenchymal stem cells in dental pulp and periapical tissues. Int Endod J 2012; 45:689-701. [DOI: 10.1111/j.1365-2591.2012.02028.x] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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Leprince JG, Leveque P, Nysten B, Gallez B, Devaux J, Leloup G. New insight into the "depth of cure" of dimethacrylate-based dental composites. Dent Mater 2012; 28:512-20. [PMID: 22217607 DOI: 10.1016/j.dental.2011.12.004] [Citation(s) in RCA: 92] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2011] [Revised: 11/29/2011] [Accepted: 12/01/2011] [Indexed: 10/14/2022]
Abstract
OBJECTIVES To demonstrate that determination of the depth of cure of resin-based composites needs to take into account the depth at which the transition between glassy and rubbery states of the resin matrix occurs. METHODS A commercially available nano-hybrid composite (Grandio) in a thick layer was light cured from one side for 10 or 40 s. Samples were analyzed by Vickers indentation, Raman spectroscopy, atomic force microscopy, electron paramagnetic imaging and differential scanning calorimetry to measure the evolution of the following properties with depth: microhardness, degree of conversion, elastic modulus of the resin matrix, trapped free radical concentration and glass transition temperature. These measurements were compared to the composite thickness remaining after scraping off the uncured, soft composite. RESULTS There was a progressive decrease in the degree of conversion and microhardness with depth as both properties still exhibited 80% of their upper surface values at 4 and 3.8 mm, respectively, for 10 s samples, and 5.6 and 4.8 mm, respectively, for 40 s samples. In contrast, there was a rapid decrease in elastic modulus at around 2.4 mm for the 10 s samples and 3.0 mm for the 40 s samples. A similar decrease was observed for concentrations of propagating radicals at 2 mm, but not for concentrations of allylic radicals, which decreased progressively. Whereas the upper composite layers presented a glass transition temperature - for 10 s, 55°C (±4) at 1 mm, 56.3°C (±2.3) at 2 mm; for 40 s, 62.3°C (±0.6) at 1 mm, 62°C (±1) at 2 mm, 62°C (±1.7) at 3 mm - the deeper layers did not display any glass transition. The thickness remaining after scraping off the soft composite was 7.01 (±0.07 mm) for 10 s samples and 9.48 (±0.22 mm) for 40 s samples. SIGNIFICANCE Appropriate methods show that the organic matrix of resin-based composite shifts from a glassy to a gel state at a certain depth. Hence, we propose a new definition for the "depth of cure" as the depth at which the resin matrix switches from a glassy to a rubbery state. Properties currently used to evaluate depth of cure (microhardness, degree of conversion or scraping methods) fail to detect this transition, which results in overestimation of the depth of cure.
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Affiliation(s)
- Julian G Leprince
- School of Dentistry and Stomatology, Université catholique de Louvain, Brussels, Belgium.
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Sorption of water, ethanol or ethanol/water solutions by light-cured dental dimethacrylate resins. Dent Mater 2011; 27:1003-10. [DOI: 10.1016/j.dental.2011.06.007] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2010] [Revised: 02/05/2011] [Accepted: 06/30/2011] [Indexed: 11/18/2022]
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Spasojević I. Free radicals and antioxidants at a glance using EPR spectroscopy. Crit Rev Clin Lab Sci 2011; 48:114-42. [DOI: 10.3109/10408363.2011.591772] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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