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Felipe de Almeida Nobre C, Feitosa VP, Fronza BM, Cipriano Leal AM, Rocha MG, Roulet JF, Coelho Sinhoreti MA. Physicochemical properties of experimental resin-based composites using tris(trimethylsilyl)silane associated with diphenyl iodonium hexafluorophosphate (DPIHP) salt. J Mech Behav Biomed Mater 2022; 130:105169. [DOI: 10.1016/j.jmbbm.2022.105169] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2022] [Revised: 02/27/2022] [Accepted: 03/03/2022] [Indexed: 11/26/2022]
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Modified POSS nano-structures as novel co-initiator-crosslinker: Synthesis and characterization. Dent Mater 2021; 37:1283-1294. [PMID: 34023144 DOI: 10.1016/j.dental.2021.04.012] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2021] [Accepted: 04/30/2021] [Indexed: 11/21/2022]
Abstract
OBJECTIVE To synthesize an amine-modified polyhedral oligomeric silsesquioxane (POSS) nano-structure as a novel co-initiator-crosslinker (co-Ini-Linker) and to determine the effect of the co-Ini-linker on the physical and mechanical behavior of an experimental dental composite. METHODS The amine-methacrylate POSS nano-structures (AMA-POSS) were chemically synthesized by anchoring a tertiary amine functionality on the methacrylate POSS (MA-POSS) branches. Three types of AMA-POSS, having different amine branches in their structures, were synthesized through the Aza Michael reaction. The chemical structure of AMA-POSSs were evaluated by1H-NMR spectroscopy. Afterward, the AMA-POSS was incorporated into a dental resin system composed of Bis-GMA, TEGDMA, and photo-initiator. Three resin systems with different AMA-POSS types were then prepared, and their properties were compared with a resin containing DMAEMA as a conventional co-initiator. The degree of conversion evaluated by FTIR spectroscopy and the shrinkage kinetics of the resins were determined through the bonded-disk technique. The flexural properties of the photopolymerized resins were also investigated. The distribution of nano-structures in the matrix resin was analyzed using EDX analysis. RESULTS The modified POSS structure and the number of amine branches were confirmed with1H-NMR spectroscopy. The resin containing 8 amine branches (P8) showed the same degree of conversion (DC%) as the resin containing DMAEMA (P > 0.05). Decreasing the amine branches in the POSS structure, however, revealed an increasing trend in DC%. The resin containing P8 showed the lowest shrinkage strain. By incorporating AMA-POSS into the resin system, the water sorption significantly decreased (P < 0.05). The flexural strength and modulus increased by adding P3 into the resin system (P < 0.05). EDX Si-map revealed that the co-Ini-linker was well dispersed in the resin matrix. SIGNIFICANCE The synthesized novel amine-methacrylate POSS nanostructures not only act as an amine co-initiator but also work as a reinforcing filler and a cross-linking agent.
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Giacoletto N, Ibrahim-Ouali M, Dumur F. Recent advances on squaraine-based photoinitiators of polymerization. Eur Polym J 2021. [DOI: 10.1016/j.eurpolymj.2021.110427] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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Ramos RQ, Moraes RR, Lopes GC. Effect of LED Light-Curing Spectral Emission Profile on Light-Cured Resin Cement Degree of Conversion. Oper Dent 2021; 46:63-74. [PMID: 33351938 DOI: 10.2341/19-234-l] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/27/2019] [Indexed: 11/23/2022]
Abstract
CLINICAL RELEVANCE The use of multipeak LED light-curing guarantees efficiency on light activation of Ivocerin-containing light-cured resin cement. SUMMARY
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Hasegawa M, Tichy A, Hosaka K, Kuno Y, Ikeda M, Nozaki K, Chiba A, Nakajima M, Tagami J. Degree of conversion and dentin bond strength of light-cured multi-mode adhesives pretreated or mixed with sulfinate agents. Dent Mater J 2021; 40:877-884. [PMID: 33678732 DOI: 10.4012/dmj.2020-346] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The influence of sulfinate agents applied as a dentin pretreatment or a mixture with multi-mode one-step self-etch adhesives (1-SEAs) on the degree of conversion (DC) and micro-tensile bond strength (μTBS) of light-cured 1-SEAs was investigated. 1-SEAs Clearfil Universal Bond Quick (UBQ) or Scotchbond Universal Adhesive (SBU) were applied to dentin in etch&rinse or self-etch mode using various application strategies: 1) no pretreatment, 2) pretreatment with 90 wt% ethanol, 3) pretreatment with a sulfinate agent Clearfil DC Activator (UDC) or Scotchbond Universal DCA (SDC), or 4) a mixture of UBQ+UDC or SBU+SDC. μTBS was measured after 24 h. Additionally, DC was measured using attenuated total reflectance Fourier-transform infrared spectroscopy. Pretreatment with sulfinate agents resulted in the highest μTBS and DC, significantly improving them especially in etch&rinse mode. The mixture of sulfinate agents with 1-SEAs was less effective. Pretreatment with ethanol significantly improved μTBS in etch&rinse mode but compromised μTBS in self-etch mode.
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Affiliation(s)
- Mayu Hasegawa
- Department of Cariology and Operative Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University
| | - Antonin Tichy
- Department of Cariology and Operative Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University.,Institute of Dental Medicine, First Faculty of Medicine of the Charles University and General University Hospital in Prague
| | - Keiichi Hosaka
- Department of Cariology and Operative Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University
| | - Yusuke Kuno
- Department of Cariology and Operative Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University
| | - Masaomi Ikeda
- Department of Oral Prosthetic Engineering, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University
| | - Kosuke Nozaki
- Department of Fixed Prosthodontics, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University
| | - Ayaka Chiba
- Department of Cariology and Operative Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University
| | - Masatoshi Nakajima
- Department of Cariology and Operative Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University
| | - Junji Tagami
- Department of Cariology and Operative Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University
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Wu Q, Liao W, Wang X, Xiong Y, Tang H. Sole‐Component Visible Macrophotoinitiators with Si‐H: Decreased Oxygen Inhibition and Modified Cured Polymer Materials. ChemistrySelect 2020. [DOI: 10.1002/slct.202001069] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Qingqing Wu
- Guizhou Provincial Key Laboratory of Computational Nano-Material Science Guizhou Education University Guiyang 550018 P. R. China
- Engineering Research Center of Organosilicon Compounds and Materials Ministry of Education College of Chemistry and Molecular Sciences Wuhan University Wuhan 430072 P. R. China
| | - Wen Liao
- Engineering Research Center of Organosilicon Compounds and Materials Ministry of Education College of Chemistry and Molecular Sciences Wuhan University Wuhan 430072 P. R. China
| | - Xiaoling Wang
- Engineering Research Center of Organosilicon Compounds and Materials Ministry of Education College of Chemistry and Molecular Sciences Wuhan University Wuhan 430072 P. R. China
| | - Ying Xiong
- Engineering Research Center of Organosilicon Compounds and Materials Ministry of Education College of Chemistry and Molecular Sciences Wuhan University Wuhan 430072 P. R. China
| | - Hongding Tang
- Engineering Research Center of Organosilicon Compounds and Materials Ministry of Education College of Chemistry and Molecular Sciences Wuhan University Wuhan 430072 P. R. China
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Bim-Júnior O, Gaglieri C, Bedran-Russo AK, Bueno-Silva B, Bannach G, Frem R, Ximenes VF, Lisboa-Filho PN. MOF-Based Erodible System for On-Demand Release of Bioactive Flavonoid at the Polymer–Tissue Interface. ACS Biomater Sci Eng 2020; 6:4539-4550. [DOI: 10.1021/acsbiomaterials.0c00564] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Odair Bim-Júnior
- Department of Physics, School of Sciences, São Paulo State University (UNESP), Bauru 17033-360, Brazil
| | - Caroline Gaglieri
- Department of Chemistry, School of Sciences, São Paulo State University (UNESP), Bauru 17033-360, Brazil
| | - Ana K. Bedran-Russo
- Department of Restorative Dentistry, College of Dentistry, University of Illinois at Chicago (UIC), Chicago 60612, United States
| | - Bruno Bueno-Silva
- Dental Research Division, Guarulhos University (UNG), Guarulhos 07023-080, Brazil
| | - Gilbert Bannach
- Department of Chemistry, School of Sciences, São Paulo State University (UNESP), Bauru 17033-360, Brazil
| | - Regina Frem
- Department of Inorganic Chemistry, Institute of Chemistry, São Paulo State University (UNESP), Araraquara 14800-060, Brazil
| | - Valdecir Farias Ximenes
- Department of Chemistry, School of Sciences, São Paulo State University (UNESP), Bauru 17033-360, Brazil
| | - Paulo N. Lisboa-Filho
- Department of Physics, School of Sciences, São Paulo State University (UNESP), Bauru 17033-360, Brazil
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Abedin F, Ye Q, Spencer P. Hydrophilic dyes as photosensitizers for photopolymerization of dental adhesives. J Dent 2020; 99:103405. [PMID: 32522687 DOI: 10.1016/j.jdent.2020.103405] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2020] [Revised: 05/30/2020] [Accepted: 06/03/2020] [Indexed: 11/17/2022] Open
Abstract
OBJECTIVES This study explored hydrophilic dyes as photosensitizers for application in dental adhesives. The goal was to identify dyes that enhance the degree of conversion (DC) of the hydrophilic-rich phase without impairing polymerization of the hydrophobic-rich phase. METHODS Properties that were investigated included the molar extinction coefficient at 480 nm, relative normalized photon absorption efficiency (PAE), rate of polymerization and degree of conversion (DC). The following hydrophilic dyes: Bromophenol blue sodium salt, Rosebengal sodium salt, Erythrosin B, New Fuchsin and Victoria blue B were identified as suitable photosensitizers. RESULTS In this study it was observed that dyes such as Bromophenol blue sodium salt, New Fuchsin, Victoria blue B and Rosebengal sodium salt were suitable candidates for dental adhesive photopolymerization, leading to substantial degree of conversion to both the hydrophilic-rich phase and the hydrophobic-rich phase. CONCLUSIONS In addition to the ability of the photosensitizer to absorb light in the visible range and transition to an excited state as a result of the absorbed energy, other factors such as the efficiency of the photosensitizer/light curing unit (LCU) combination, stability/efficiency of the excited state of the photosensitizer and/or initiating reactive species play an important role in the photopolymerization of the dental adhesive.
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Affiliation(s)
- Farhana Abedin
- Department of Electromechanical Engineering Technology, California State Polytechnic University, 3801 W Temple Ave, Pomona, CA, 91768, United States.
| | - Qiang Ye
- Institute of Bioengineering Research Laboratories, The University of Kansas, 1530 W 15thStreet, Lawrence, KS, 66045, United States.
| | - Paulette Spencer
- Institute of Bioengineering Research Laboratories, The University of Kansas, 1530 W 15thStreet, Lawrence, KS, 66045, United States; Department of Mechanical Engineering, The University of Kansas, 1530 W 15thStreet, Lawrence, KS, 66045, United States.
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Balcerak A, Kwiatkowska D, Iwińska K, Kabatc J. Highly efficient UV-Vis light activated three-component photoinitiators composed of tris(trimethylsilyl)silane for polymerization of acrylates. Polym Chem 2020. [DOI: 10.1039/d0py00763c] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The goal of this paper concerns the evaluation of the efficiency of novel three-component systems for initiating the photopolymerization process of 2-ethyl-2-(hydroxymethyl)-1,3-propanediol triacrylate (TMPTA).
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Affiliation(s)
- Alicja Balcerak
- UTP University of Science and Technology
- Faculty of Chemical Technology and Engineering
- 85-326 Bydgoszcz
- Poland
| | - Dominika Kwiatkowska
- UTP University of Science and Technology
- Faculty of Chemical Technology and Engineering
- 85-326 Bydgoszcz
- Poland
| | - Katarzyna Iwińska
- UTP University of Science and Technology
- Faculty of Chemical Technology and Engineering
- 85-326 Bydgoszcz
- Poland
| | - Janina Kabatc
- UTP University of Science and Technology
- Faculty of Chemical Technology and Engineering
- 85-326 Bydgoszcz
- Poland
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Kirschner J, Szillat F, Bouzrati-Zerelli M, Becht JM, Klee JE, Lalevée J. Sulfinates and sulfonates as high performance co-initiators in CQ based systems: Towards aromatic amine-free systems for dental restorative materials. Dent Mater 2019; 36:187-196. [PMID: 31791740 DOI: 10.1016/j.dental.2019.11.020] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2019] [Revised: 10/27/2019] [Accepted: 11/15/2019] [Indexed: 12/30/2022]
Abstract
OBJECTIVE The aim of our study is to develop amine-free photoinitiating systems (PISs) for the polymerization of representative dental methacrylate resins under blue light irradiation. PISs based on camphorquinone (CQ)/sulfinate and CQ/sulfonate, eventually in combination with an iodonium salt, are proposed and compared to the well-established CQ/amine system. The polymerization performances of thick (1.4 mm) samples of different methacrylate blends upon exposure to a commercial blue LED centered at 477 nm under air are described. Finally, the performances of the new developed PISs are evaluated for dental composites application. METHODS FTIR is used to monitor the photopolymerization profiles. ESR spectroscopy and electrochemical experiments are used to identify the radicals generated. Mechanical properties measurements and color stability measurements are carried out to determine the key properties of the dental composites prepared. RESULTS AND SIGNIFICIANCE The performances of the new proposed PISs for the photopolymerization of thick (1.4 mm) samples of methacrylate upon exposure to a blue dental LED under air are excellent. Similar or better performances and bleaching properties are obtained with the new proposed amine-free systems compared to those reached with the CQ/amine reference system. Dental composites with excellent mechanical properties and exceptional color stability are obtained. The involved chemical mechanisms for the initiation step were also established.
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Affiliation(s)
- Julie Kirschner
- Institut de Science des Matériaux de Mulhouse IS2M, UMR CNRS 7361, UHA, 15 Rue Jean Starcky, 68057 Mulhouse Cedex, France
| | | | - Mariem Bouzrati-Zerelli
- Institut de Science des Matériaux de Mulhouse IS2M, UMR CNRS 7361, UHA, 15 Rue Jean Starcky, 68057 Mulhouse Cedex, France
| | - Jean-Michel Becht
- Institut de Science des Matériaux de Mulhouse IS2M, UMR CNRS 7361, UHA, 15 Rue Jean Starcky, 68057 Mulhouse Cedex, France
| | | | - Jacques Lalevée
- Institut de Science des Matériaux de Mulhouse IS2M, UMR CNRS 7361, UHA, 15 Rue Jean Starcky, 68057 Mulhouse Cedex, France.
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Graf D, Burchard S, Crespo J, Megnin C, Gutsch S, Zacharias M, Hanemann T. Influence of Al₂O₃ Nanoparticle Addition on a UV Cured Polyacrylate for 3D Inkjet Printing. Polymers (Basel) 2019; 11:polym11040633. [PMID: 30959918 PMCID: PMC6523912 DOI: 10.3390/polym11040633] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2019] [Revised: 03/29/2019] [Accepted: 04/04/2019] [Indexed: 12/20/2022] Open
Abstract
The brittleness of acrylic photopolymers, frequently used in 3D Inkjet printing, limits their utilization in structural applications. In this study, a process was developed for the production and characterization of an alumina-enhanced nanocomposite with improved mechanical properties for Inkjet printing. Ceramic nanoparticles with an average primary particle size (APPS) of 16 nm and 31 nm, which was assessed via high-resolution scanning electron microscopy (HRSEM), were functionalized with 3.43 and 5.59 mg/m2 3-(trimethoxysilyl)propyl methacrylate (MPS), respectively, while being ground in a ball mill. The suspensions of the modified fillers in a newly formulated acrylic mixture showed viscosities of 14 and 7 mPa∙s at the printing temperature of 60 °C. Ink-jetting tests were conducted successfully without clogging the printing nozzles. Tensile tests of casted specimens showed an improvement of the tensile strength and elongation at break in composites filled with 31 nm by 10.7% and 74.9%, respectively, relative to the unfilled polymer.
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Affiliation(s)
- Dennis Graf
- Institute for Applied Materials, Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany.
- Laboratory for Materials Processing, University of Freiburg, 79110 Freiburg, Germany.
| | - Sven Burchard
- Laboratory for Materials Processing, University of Freiburg, 79110 Freiburg, Germany.
| | - Julian Crespo
- TECNAN, Tecnología Navarra de Nanoproductos S.L, Industrial Area Perguita, C/A No. 1, 31210 Los Arcos, Spain.
| | - Christof Megnin
- Institute of Microstructure Technology, Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany.
| | - Sebastian Gutsch
- Laboratory for Nanotechnology, University of Freiburg, 79110 Freiburg, Germany.
| | - Margit Zacharias
- Laboratory for Nanotechnology, University of Freiburg, 79110 Freiburg, Germany.
| | - Thomas Hanemann
- Institute for Applied Materials, Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany.
- Laboratory for Materials Processing, University of Freiburg, 79110 Freiburg, Germany.
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Effect of diphenyliodonium hexafluorophosphate salt on experimental infiltrants containing different diluents. Odontology 2018; 107:202-208. [DOI: 10.1007/s10266-018-0391-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2018] [Accepted: 09/19/2018] [Indexed: 10/28/2022]
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Ye Q, Abedin F, Parthasarathy R, Spencer P. Photoinitiators in Dentistry: Challenges and Advances. PHOTOPOLYMERISATION INITIATING SYSTEMS 2018. [DOI: 10.1039/9781788013307-00297] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Photopolymerization is used in a wide range of clinical applications in dentistry and the demand for dental materials that can restore form, function and esthetics is increasing rapidly. Simultaneous with this demand is the growing need for photoinitiators that provide effective and efficient in situ polymerization of dental materials using visible light irradiation. This chapter reviews the fundamentals of Type I and II photoinitiators. The advantages and disadvantages of these photoinitiators will be considered with a particular focus on parameters that affect the polymerization process in the oral cavity. The chapter examines recent developments in photoinitiators and opportunities for future research in the design and development of photoinitiators for dental applications. Future research directions that employ computational models in conjunction with iterative synthesis and experimental methods will also be explored in this chapter.
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Affiliation(s)
- Qiang Ye
- Institute for Bioengineering Research, School of Engineering, University of Kansas 1530 W. 15th St Lawrence KS 66045 USA
| | - Farhana Abedin
- Electromechanical Engineering Technology program, College of Engineering, California State Polytechnic University Pomona 3801 W. Temple Ave Pomona CA 91768 USA
| | - Ranganathan Parthasarathy
- Nanomaterials Research Lab, Tennessee State University 3500 John A Merritt Blvd Nashville TN 37209 USA
| | - Paulette Spencer
- Institute for Bioengineering Research, School of Engineering, University of Kansas 1530 W. 15th St Lawrence KS 66045 USA
- Department of Mechanical Engineering, University of Kansas 1530 W. 15th St Lawrence KS 66045 USA
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Chatgilialoglu C, Ferreri C, Landais Y, Timokhin VI. Thirty Years of (TMS)3SiH: A Milestone in Radical-Based Synthetic Chemistry. Chem Rev 2018; 118:6516-6572. [DOI: 10.1021/acs.chemrev.8b00109] [Citation(s) in RCA: 138] [Impact Index Per Article: 23.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
| | - Carla Ferreri
- ISOF, Consiglio Nazionale delle Ricerche, Via P. Gobetti 101, 40129 Bologna, Italy
| | - Yannick Landais
- University of Bordeaux, Institute of Molecular Sciences, UMR-CNRS 5255, 351 cours de la libération, 33405 Talence Cedex, France
| | - Vitaliy I. Timokhin
- Department of Biochemistry, University of Wisconsin-Madison, 1552 University Avenue, Madison, Wisconsin 53726, United States
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Keskin D, Mokabbar T, Pei Y, Van Rijn P. The Relationship between Bulk Silicone and Benzophenone-Initiated Hydrogel Coating Properties. Polymers (Basel) 2018; 10:E534. [PMID: 30966568 PMCID: PMC6415430 DOI: 10.3390/polym10050534] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2018] [Revised: 05/04/2018] [Accepted: 05/09/2018] [Indexed: 12/28/2022] Open
Abstract
Polydimethylsiloxane (PDMS) is a silicone elastomer-based material that is used in various applications, including coatings, tubing, microfluidics, and medical implants. PDMS has been modified with hydrogel coatings to prevent fouling, which can be done through UV-mediated free radical polymerization using benzophenone. However, to the best of our knowledge, the properties of hydrogel coatings and their influence on the bulk properties of PDMS under various preparation conditions, such as the type and concentration of monomers, and UV treatment time, have never been investigated. Acrylate-based monomers were used to perform free radical polymerization on PDMS surfaces under various reaction conditions. This approach provides insights into the relationship between the hydrogel coating and bulk properties of PDMS. Altering the UV polymerization time and the monomer concentration resulted in different morphologies with different roughness and thickness of the hydrogel coating, as well as differences in the bulk material stiffness. The surface morphology of the coated PDMS was characterized by AFM. The cross section and thickness of the coatings were examined using scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy. The dependence of coating development on the monomer type and concentration used was evaluated by surface hydrophilicity, as measured by water contact angle. Elongation-until-break analysis revealed that specific reaction conditions affected the bulk properties and made the coated PDMS brittle. Therefore, boundary conditions have been identified to enable high quality hydrogel coating formation without affecting the bulk properties of the material.
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Affiliation(s)
- Damla Keskin
- University Medical Center Groningen, Department of Biomedical Engineering-FB40, W.J. Kolff Institute for Biomedical Engineering and Materials Science-FB41, University of Groningen, A. Deusinglaan 1, 9713 AV Groningen, The Netherlands.
| | - Taraneh Mokabbar
- Engineering and Technology Institute Groningen, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands.
| | - Yutao Pei
- Engineering and Technology Institute Groningen, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands.
| | - Patrick Van Rijn
- University Medical Center Groningen, Department of Biomedical Engineering-FB40, W.J. Kolff Institute for Biomedical Engineering and Materials Science-FB41, University of Groningen, A. Deusinglaan 1, 9713 AV Groningen, The Netherlands.
- Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands.
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Song L, Ye Q, Ge X, Misra A, Tamerler C, Spencer P. Probing the neutralization behavior of zwitterionic monomer-containing dental adhesive. Dent Mater 2017; 33:564-574. [PMID: 28366234 PMCID: PMC5480395 DOI: 10.1016/j.dental.2017.03.013] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2016] [Revised: 01/28/2017] [Accepted: 03/14/2017] [Indexed: 01/29/2023]
Abstract
OBJECTIVE To investigate the polymerization kinetics, neutralization behavior, and mechanical properties of amine-functionalized dental adhesive cured in the presence of zwitterionic monomer, methacryloyloxyethyl phosphorylcholine (MPC). METHODS The control adhesive was a mixture based on HEMA/BisGMA/2-N-morpholinoethyl methacrylate (MEMA) (40/30/30, w/w/w). The control and experimental formulations containing MPC were characterized with regard to water miscibility of liquid resins, photopolymerization kinetics, water sorption and solubility, dynamic mechanical properties and leachables from the polymers (aged in ethanol). The neutralization behavior of the adhesives was determined by monitoring the pH of lactic acid (LA) solution. RESULTS The water miscibility decreased with increasing MPC amount. The water sorption of experimental copolymer specimen was greater than the control. The addition of 8wt% water led to improved photo-polymerization efficiency for experimental formulations at MPC of 2.5 and 5wt%, and significant reduction in the cumulative amounts of leached HEMA, BisGMA, and MEMA, i.e. 90, 60 and 50% reduction, respectively. The neutralization rate of MPC-containing adhesive was faster than control. The optimal MPC concentration in the formulations was 5wt%. SIGNIFICANCE Incompatibility between MEMA and MPC led to a decrease in water miscibility of the liquid resins. Water (at 8wt%) in the MPC-containing formulations (2.5-5wt% MPC) led to higher DC, faster RPmax and significant reduction in leached HEMA, BisGMA, and MEMA. The neutralization rate was enhanced with the addition of MPC in the amine-containing formulation. Promoting the neutralization capability of dentin adhesives could play an important role in reducing recurrent decay at the composite/tooth interface.
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Affiliation(s)
- Linyong Song
- University of Kansas, Bioengineering Research Center, 1530 W. 15th Street, Lawrence, KS 66045-7609, USA
| | - Qiang Ye
- University of Kansas, Bioengineering Research Center, 1530 W. 15th Street, Lawrence, KS 66045-7609, USA.
| | - Xueping Ge
- University of Kansas, Bioengineering Research Center, 1530 W. 15th Street, Lawrence, KS 66045-7609, USA
| | - Anil Misra
- University of Kansas, Bioengineering Research Center, 1530 W. 15th Street, Lawrence, KS 66045-7609, USA; University of Kansas, Department of Civil Engineering, 1530 W. 15th Street, Lawrence, KS 66045-7609, USA
| | - Candan Tamerler
- University of Kansas, Bioengineering Research Center, 1530 W. 15th Street, Lawrence, KS 66045-7609, USA; University of Kansas, Department of Mechanical Engineering, 1530 W. 15th Street, Lawrence, KS 66045-7609, USA
| | - Paulette Spencer
- University of Kansas, Bioengineering Research Center, 1530 W. 15th Street, Lawrence, KS 66045-7609, USA; University of Kansas, Department of Mechanical Engineering, 1530 W. 15th Street, Lawrence, KS 66045-7609, USA.
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