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Josette Camilleri - One of the best experts on this subject based on the ideXlab platform.
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a quantitative method for determining the antiwashout characteristics of cement based Dental Materials including mineral trioxide aggregate
International Endodontic Journal, 2013Co-Authors: L. M. Formosa, Bertram Mallia, Josette CamilleriAbstract:Formosa LM, Mallia B, Camilleri J. A quantitative method for determining the antiwashout characteristics of cement-based Dental Materials including mineral trioxide aggregate. International Endodontic Journal. Aim To introduce and assess a novel method for measuring washout resistance of cement-based Dental Materials, including mineral trioxide aggregate (MTA), to qualitatively verify the results with a clinical simulation and to evaluate the washout resistance of a new root-end filling material. Methodology A method for assessment of washout resistance of root-end filling Materials was developed by adapting the CRD-C 661-06 (a method for evaluating the resistance of freshly mixed concrete to washout in water), to permit testing of Dental cements. White Portland cement (PC), MTA-Plus mixed with either water or a polymer-based antiwashout gel (MTA-AW), MTA-Angelus, IRM and amalgam were tested with either distilled water or HBSS as washout media. Additionally, the washout resistance was tested qualitatively by spraying the test Materials at the terminus of simulated canals with a metered jet of water. Results A mass loss of 2–7% for PC, 0.4–4% for MTA-Plus, � 0.9% for MTA-AW, 5–10% for MTAAngelus and 0% for IRM and amalgam was recorded with the modified CRD-C 661-06 method. No significant difference was found between using water and HBSS as washout media for the same material. The results of the modified CRD-C 661-06 method were similar to those obtained on the simulated canals. Conclusions The modified CRD-C 661-06 method provided repeatable results that were comparable to the simulated clinical method. The antiwashout gel used with MTA-Plus reduced the material washout and was similar to IRM and amalgam.
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A quantitative method for determining the antiwashout characteristics of cement-based Dental Materials including mineral trioxide aggregate
International Endodontic Journal, 2013Co-Authors: L. M. Formosa, Bertram Mallia, Josette CamilleriAbstract:AIM: To introduce and assess a novel method for measuring washout resistance of cement-based Dental Materials, including mineral trioxide aggregate (MTA), to qualitatively verify the results with a clinical simulation and to evaluate the washout resistance of a new root-end filling material.\n\nMETHODOLOGY: A method for assessment of washout resistance of root-end filling Materials was developed by adapting the CRD-C 661-06 (a method for evaluating the resistance of freshly mixed concrete to washout in water), to permit testing of Dental cements. White Portland cement (PC), MTA-Plus mixed with either water or a polymer-based antiwashout gel (MTA-AW), MTA-Angelus, IRM and amalgam were tested with either distilled water or HBSS as washout media. Additionally, the washout resistance was tested qualitatively by spraying the test Materials at the terminus of simulated canals with a metered jet of water.\n\nRESULTS: A mass loss of 2-7% for PC, 0.4-4% for MTA-Plus, -0.9% for MTA-AW, 5-10% for MTA-Angelus and 0% for IRM and amalgam was recorded with the modified CRD-C 661-06 method. No significant difference was found between using water and HBSS as washout media for the same material. The results of the modified CRD-C 661-06 method were similar to those obtained on the simulated canals.\n\nCONCLUSIONS: The modified CRD-C 661-06 method provided repeatable results that were comparable to the simulated clinical method. The antiwashout gel used with MTA-Plus reduced the material washout and was similar to IRM and amalgam.
L. M. Formosa - One of the best experts on this subject based on the ideXlab platform.
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a quantitative method for determining the antiwashout characteristics of cement based Dental Materials including mineral trioxide aggregate
International Endodontic Journal, 2013Co-Authors: L. M. Formosa, Bertram Mallia, Josette CamilleriAbstract:Formosa LM, Mallia B, Camilleri J. A quantitative method for determining the antiwashout characteristics of cement-based Dental Materials including mineral trioxide aggregate. International Endodontic Journal. Aim To introduce and assess a novel method for measuring washout resistance of cement-based Dental Materials, including mineral trioxide aggregate (MTA), to qualitatively verify the results with a clinical simulation and to evaluate the washout resistance of a new root-end filling material. Methodology A method for assessment of washout resistance of root-end filling Materials was developed by adapting the CRD-C 661-06 (a method for evaluating the resistance of freshly mixed concrete to washout in water), to permit testing of Dental cements. White Portland cement (PC), MTA-Plus mixed with either water or a polymer-based antiwashout gel (MTA-AW), MTA-Angelus, IRM and amalgam were tested with either distilled water or HBSS as washout media. Additionally, the washout resistance was tested qualitatively by spraying the test Materials at the terminus of simulated canals with a metered jet of water. Results A mass loss of 2–7% for PC, 0.4–4% for MTA-Plus, � 0.9% for MTA-AW, 5–10% for MTAAngelus and 0% for IRM and amalgam was recorded with the modified CRD-C 661-06 method. No significant difference was found between using water and HBSS as washout media for the same material. The results of the modified CRD-C 661-06 method were similar to those obtained on the simulated canals. Conclusions The modified CRD-C 661-06 method provided repeatable results that were comparable to the simulated clinical method. The antiwashout gel used with MTA-Plus reduced the material washout and was similar to IRM and amalgam.
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A quantitative method for determining the antiwashout characteristics of cement-based Dental Materials including mineral trioxide aggregate
International Endodontic Journal, 2013Co-Authors: L. M. Formosa, Bertram Mallia, Josette CamilleriAbstract:AIM: To introduce and assess a novel method for measuring washout resistance of cement-based Dental Materials, including mineral trioxide aggregate (MTA), to qualitatively verify the results with a clinical simulation and to evaluate the washout resistance of a new root-end filling material.\n\nMETHODOLOGY: A method for assessment of washout resistance of root-end filling Materials was developed by adapting the CRD-C 661-06 (a method for evaluating the resistance of freshly mixed concrete to washout in water), to permit testing of Dental cements. White Portland cement (PC), MTA-Plus mixed with either water or a polymer-based antiwashout gel (MTA-AW), MTA-Angelus, IRM and amalgam were tested with either distilled water or HBSS as washout media. Additionally, the washout resistance was tested qualitatively by spraying the test Materials at the terminus of simulated canals with a metered jet of water.\n\nRESULTS: A mass loss of 2-7% for PC, 0.4-4% for MTA-Plus, -0.9% for MTA-AW, 5-10% for MTA-Angelus and 0% for IRM and amalgam was recorded with the modified CRD-C 661-06 method. No significant difference was found between using water and HBSS as washout media for the same material. The results of the modified CRD-C 661-06 method were similar to those obtained on the simulated canals.\n\nCONCLUSIONS: The modified CRD-C 661-06 method provided repeatable results that were comparable to the simulated clinical method. The antiwashout gel used with MTA-Plus reduced the material washout and was similar to IRM and amalgam.
Bertram Mallia - One of the best experts on this subject based on the ideXlab platform.
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a quantitative method for determining the antiwashout characteristics of cement based Dental Materials including mineral trioxide aggregate
International Endodontic Journal, 2013Co-Authors: L. M. Formosa, Bertram Mallia, Josette CamilleriAbstract:Formosa LM, Mallia B, Camilleri J. A quantitative method for determining the antiwashout characteristics of cement-based Dental Materials including mineral trioxide aggregate. International Endodontic Journal. Aim To introduce and assess a novel method for measuring washout resistance of cement-based Dental Materials, including mineral trioxide aggregate (MTA), to qualitatively verify the results with a clinical simulation and to evaluate the washout resistance of a new root-end filling material. Methodology A method for assessment of washout resistance of root-end filling Materials was developed by adapting the CRD-C 661-06 (a method for evaluating the resistance of freshly mixed concrete to washout in water), to permit testing of Dental cements. White Portland cement (PC), MTA-Plus mixed with either water or a polymer-based antiwashout gel (MTA-AW), MTA-Angelus, IRM and amalgam were tested with either distilled water or HBSS as washout media. Additionally, the washout resistance was tested qualitatively by spraying the test Materials at the terminus of simulated canals with a metered jet of water. Results A mass loss of 2–7% for PC, 0.4–4% for MTA-Plus, � 0.9% for MTA-AW, 5–10% for MTAAngelus and 0% for IRM and amalgam was recorded with the modified CRD-C 661-06 method. No significant difference was found between using water and HBSS as washout media for the same material. The results of the modified CRD-C 661-06 method were similar to those obtained on the simulated canals. Conclusions The modified CRD-C 661-06 method provided repeatable results that were comparable to the simulated clinical method. The antiwashout gel used with MTA-Plus reduced the material washout and was similar to IRM and amalgam.
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A quantitative method for determining the antiwashout characteristics of cement-based Dental Materials including mineral trioxide aggregate
International Endodontic Journal, 2013Co-Authors: L. M. Formosa, Bertram Mallia, Josette CamilleriAbstract:AIM: To introduce and assess a novel method for measuring washout resistance of cement-based Dental Materials, including mineral trioxide aggregate (MTA), to qualitatively verify the results with a clinical simulation and to evaluate the washout resistance of a new root-end filling material.\n\nMETHODOLOGY: A method for assessment of washout resistance of root-end filling Materials was developed by adapting the CRD-C 661-06 (a method for evaluating the resistance of freshly mixed concrete to washout in water), to permit testing of Dental cements. White Portland cement (PC), MTA-Plus mixed with either water or a polymer-based antiwashout gel (MTA-AW), MTA-Angelus, IRM and amalgam were tested with either distilled water or HBSS as washout media. Additionally, the washout resistance was tested qualitatively by spraying the test Materials at the terminus of simulated canals with a metered jet of water.\n\nRESULTS: A mass loss of 2-7% for PC, 0.4-4% for MTA-Plus, -0.9% for MTA-AW, 5-10% for MTA-Angelus and 0% for IRM and amalgam was recorded with the modified CRD-C 661-06 method. No significant difference was found between using water and HBSS as washout media for the same material. The results of the modified CRD-C 661-06 method were similar to those obtained on the simulated canals.\n\nCONCLUSIONS: The modified CRD-C 661-06 method provided repeatable results that were comparable to the simulated clinical method. The antiwashout gel used with MTA-Plus reduced the material washout and was similar to IRM and amalgam.
Evandro Piva - One of the best experts on this subject based on the ideXlab platform.
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polymerization shrinkage stress of resin based Dental Materials a systematic review and meta analyses of composition strategies
Journal of The Mechanical Behavior of Biomedical Materials, 2018Co-Authors: Carine Tais Welter Meereis, Eliseu A Munchow, Wellington Luiz De Oliveira Da Rosa, Adriana Fernandes Da Silva, Evandro PivaAbstract:Abstract Purpose A systematic review was conducted to determine whether there were composition strategies available to reduce and control polymerization shrinkage stress development in resin-based restorative Dental Materials. Data sources This report was reported in accordance with the PRISMA Statement. Two reviewers performed a literature search up to December 2016, without restriction of the year of publication, in seven databases: PubMed, Web of Science, Scopus, SciELO, LILACS, IBECS, and BBO. Study selection Only laboratory studies that evaluated polymerization shrinkage stress by direct testing were included. Pilot studies, reviews and in vitro studies that evaluated polymerization shrinkage stress by indirect methods (e.g., microleakage or cuspal deflection measurements), finite elemental analysis, or theoretical and mathematical models were excluded. Of the 6113 eligible articles, 62 studies were included in the qualitative analysis, and the meta-analysis was performed with 58 studies. The composition strategy was subdivided according to the modified part of the material: filler phase, coupling agent, or resin matrix. A global comparison was performed with random-effects models (α = 0.05). The only subgroup that did not show a statistical difference between the alternative strategy and the control was ‘the use of alternative photo-initiators’ (p = 0.29). Conclusion Modification of the resin matrix made the largest contribution to minimizing stress development. The technology used for decreasing stress in the formulation of low-shrinkage and bulk-fill Materials was shown to be a promising application for reducing and controlling stress development.
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polymerization shrinkage stress of resin based Dental Materials a systematic review and meta analyses of technique protocol and photo activation strategies
Journal of The Mechanical Behavior of Biomedical Materials, 2018Co-Authors: Eliseu A Munchow, Carine Tais Welter Meereis, Wellington Luiz De Oliveira Da Rosa, Adriana Fernandes Da Silva, Evandro PivaAbstract:Abstract Purpose A systematic review was conducted to determine whether there were any alternative technique or additional step strategies available to reduce and control polymerization shrinkage stress development in Dental resin-based restorative Materials. Data sources This report followed the PRISMA Statement. A total of 36 studies were included in this review. Two reviewers performed a literature search up to December 2016, without restriction of the year of publication, in seven databases: PubMed, Web of Science, Scopus, SciELO, LILACS, IBECS, and BBO. Study selection Only in vitro studies that evaluated polymerization shrinkage stress by direct testing were included. Pilot studies, reviews and in vitro studies that evaluated polymerization shrinkage stress by indirect methods (e.g., microleakage or cuspal deflection measurements), finite elemental analysis or mathematical models were excluded. Of the 6.113 eligible articles, 36 studies were included in the qualitative analysis, and the meta-analysis was performed with 25 studies. A global comparison was performed with random-effects models (α = 0.05). The strategies were subdivided as follows: the use of an alternative technique protocol of placing the material inside the tooth cavity; the modification of the irradiation intensity or total energy delivered to the material; the use of an alternative light-curing source; or the use of an alternative photo-activation mode. All alternative strategies showed statistically significant differences when compared with their respective controls (p Conclusion The use of alternative light-curing sources contributed more to minimizing stress development than placing the material by means of an alternative technique protocol or by modifying the irradiant intensity or total energy delivered to the material during photo-activation. Moreover, the use of an alternative photo-activation mode (intermittent light, exponential, soft-start or pulse delay modes) was shown to be an effective strategy for reducing and controlling stress development in resin-based Dental Materials.
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1 3 diethyl 2 thiobarbituric acid as an alternative coinitiator for acidic photopolymerizable Dental Materials
Journal of Biomedical Materials Research Part B, 2013Co-Authors: Eliseu A Munchow, Evandro Piva, Lisia Lorea Valente, Sonia Luque Peralta, Maria Raquel Fernandez, Giana Da Silveira Lima, Cesar Liberato Petzhold, Fabricio Aulo OgliariAbstract:The ethyl-4-dimethylaminobenzoate (EDAB) is widely used as a coinitiator of the camphorquinone (CQ), but in acidic circumstances it might present some instability, reducing the polymerization efficiency of the material. Considering this, new coinitiators are being evaluated. Hence, this study evaluated the kinetic of polymerization (KP), the degree of conversion (DC), and the rate of polymerization (RP) of experimental resin adhesives containing 1,3-diethyl-2-thiobarbituric acid (TBA) as a coinitiator of the CQ. The experimental monomeric blend was prepared with bisphenol A glycidyl dimethacrylate, 2-hydroxyethyl methacrylate, and acidic monomers. CQ was added at 1 mol % as photoinitiator. Six groups were formulated: four containing concentrations of 0.1, 0.5, 1, and 2 mol % of TBA, one without coinitiator, and the last one containing 1 mol % of EDAB (control group). The KP and the RP were performed using real-time Fourier Transform infrared spectroscopy. The group without coinitiator has not formed a polymer, whereas the addition of TBA resulted in the conversion of monomers in polymer. The DC of the adhesives was as higher as the increase in the TBA content. The group with 2 mol % of TBA presented improved DC and reactivity (RP) than the other groups and the control one. Hence, the TBA has performed as a coinitiator of the CQ for the radical polymerization of methacrylate resin adhesives and it has improved the DC and the reactivity of the Materials. Thus, it is a potential coinitiator for the photopolymerization of Dental Materials. © 2013 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater 101B: 1217–1221, 2013.
Anthony J Smith - One of the best experts on this subject based on the ideXlab platform.
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tooth slice organ culture for cytotoxicity assessment of Dental Materials
Biomaterials, 2000Co-Authors: Peter E Murray, P J Lumley, Hamish F Ross, Anthony J SmithAbstract:The purpose of this work was to develop a tooth slice organ culture method to assess the response of the cells of the Dental pulp to commonly used Dental Materials and products. Wistar rat tooth slices were grown in culture for two and ten days in the presence of Dental Materials. After culture, the tooth tissues were processed and the responses of the pulpal cells were analysed histomorphometrically. Cytotoxic cell destruction was observed following the direct application of test Materials to tooth slices (n = 298) after 10 days in culture (MANOVA, P = 0.0001), whilst the restoration of prepared deep dentine cavities (n = 30), with test products, did not result in a significant amount of pulpal injury (MANOVA, P = 0.287). In rank order of causing pulpal injury, the test Materials from the most to the least cell destructive, was; Salicylic acid. Calcium hydroxide, Kalzinol zinc oxide eugenol, high-mercury Amalgam, Prime & Bond, Dycal, Barium sulphate, Hypocal, Scotchbond, Calasept, Life and One-step. Tooth slice organ culture, provided a cytotoxicity screening method for Dental Materials, bearing a closer physiological resemblance to the clinical situation than cell culture screening methods. Tooth slice culturing may have the potential to replace some types of in vivo animal experimentation, as there is a clear need to reduce this form of testing.