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D’Alpino PHP, Svizero NDR, Bim Júnior O, Valduga CJ, Graeff CFDO, Sauro S. Effects of age condition on the distribution and integrity of inorganic fillers in dental resin composites. Clin Oral Investig 2015; 20:1011-9. [DOI: 10.1007/s00784-015-1599-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2015] [Accepted: 09/10/2015] [Indexed: 11/29/2022]
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102
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Kong D, Xiao X, Qiu X, Zhang W, Yang Y. Synthesis of Hydroxyapatite Nanorods under Mild Conditions and Their Drug Release Properties. CHINESE J CHEM 2015. [DOI: 10.1002/cjoc.201500343] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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103
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Blöcher S, Frankenberger R, Hellak A, Schauseil M, Roggendorf MJ, Korbmacher-Steiner HM. Effect on enamel shear bond strength of adding microsilver and nanosilver particles to the primer of an orthodontic adhesive. BMC Oral Health 2015; 15:42. [PMID: 25887896 PMCID: PMC4374300 DOI: 10.1186/s12903-015-0024-8] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2014] [Accepted: 03/03/2015] [Indexed: 11/29/2022] Open
Abstract
Background The objective of this study was to determine whether the addition of microsilver or nanosilver particles to an orthodontic primer affects shear bond strength (SBS) and bracket/adhesive failure. Methods Bovine incisors were randomly divided into six groups with 16 specimens in each: In group 1 (control), brackets were bonded with Transbond™ XT primer. In the experimental groups, microsilver (groups 2 and 3) and nanosilver (groups 4–6) particles of different sizes were added to Transbond XT primer and light cured for 15 seconds [group 2: 0.1% (w/w) microsilver particle size 3.5–18 μm; group 3: 0.3% (w/w) microsilver particle size 3.5–18 μm; group 4: 0.11% (w/w) nanosilver particle size 12.6–18.5 nm; group 5: 0.18% (w/w) nanosilver particle size 12.6–18.5 nm; group 6: 0.33% (w/w) nanosilver particle size 12.6–18.5 nm]. Thereafter, brackets were bonded by light curing the adhesive for 20 seconds. After 24 hours of storage in distilled water at 37°C, SBS was measured with a Zwicki 1120 testing machine. The adhesive remnant index and the prevalence of silver spots on the specimen surface were determined under 10× magnification. Statistical two-way analysis of variance was performed to compare SBS, and a chi-square test was used to compare ARI scores and the prevalence of silver spots. Results No significant differences in SBS (control: 16.59 ± 6.82 MPa; group 2: 20.6 ± 4.19 MPa; group 3: 16.98 ± 4.84 MPa; group 4: 17.15 ± 5.92 MPa; group 5: 20.09 ± 3.35 MPa; group 6: 16.44 ± 4.51 MPa; p > 0.665) and ARI scores (p = 0.901) were found between the control group and any experimental group. Only experimental groups with nanosilver particles revealed statistically more silver spots on the remaining adhesive. Conclusions Addition of small concentrations of microsilver or nanosilver particles affects neither SBS nor ARI scores. Addition of nanosilver particles results in silver spots in the remaining primer visible under 10× magnification. Further studies are needed to investigate the anti-caries potential and clinical performance of conventional orthodontic primer with incorporated nanosilver or microsilver particles.
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Affiliation(s)
- Sonja Blöcher
- Department of Orthodontics, University Hospital Giessen and Marburg, Campus Marburg, Georg-Voigt-Strasse 3, Marburg, 35039, Germany.
| | - Roland Frankenberger
- Department of Operative Dentistry and Endodontology, University Hospital Giessen and Marburg, Campus Marburg, Georg-Voigt-Strasse 3, Marburg, 35039, Germany.
| | - Andreas Hellak
- Department of Orthodontics, University Hospital Giessen and Marburg, Campus Marburg, Georg-Voigt-Strasse 3, Marburg, 35039, Germany.
| | - Michael Schauseil
- Department of Orthodontics, University Hospital Giessen and Marburg, Campus Marburg, Georg-Voigt-Strasse 3, Marburg, 35039, Germany.
| | - Matthias J Roggendorf
- Department of Operative Dentistry and Endodontology, University Hospital Giessen and Marburg, Campus Marburg, Georg-Voigt-Strasse 3, Marburg, 35039, Germany.
| | - Heike Maria Korbmacher-Steiner
- Department of Orthodontics, University Hospital Giessen and Marburg, Campus Marburg, Georg-Voigt-Strasse 3, Marburg, 35039, Germany.
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Besinis A, De Peralta T, Tredwin CJ, Handy RD. Review of nanomaterials in dentistry: interactions with the oral microenvironment, clinical applications, hazards, and benefits. ACS NANO 2015; 9:2255-2289. [PMID: 25625290 DOI: 10.1021/nn505015e] [Citation(s) in RCA: 132] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Interest in the use of engineered nanomaterials (ENMs) as either nanomedicines or dental materials/devices in clinical dentistry is growing. This review aims to detail the ultrafine structure, chemical composition, and reactivity of dental tissues in the context of interactions with ENMs, including the saliva, pellicle layer, and oral biofilm; then describes the applications of ENMs in dentistry in context with beneficial clinical outcomes versus potential risks. The flow rate and quality of saliva are likely to influence the behavior of ENMs in the oral cavity, but how the protein corona formed on the ENMs will alter bioavailability, or interact with the structure and proteins of the pellicle layer, as well as microbes in the biofilm, remains unclear. The tooth enamel is a dense crystalline structure that is likely to act as a barrier to ENM penetration, but underlying dentinal tubules are not. Consequently, ENMs may be used to strengthen dentine or regenerate pulp tissue. ENMs have dental applications as antibacterials for infection control, as nanofillers to improve the mechanical and bioactive properties of restoration materials, and as novel coatings on dental implants. Dentifrices and some related personal care products are already available for oral health applications. Overall, the clinical benefits generally outweigh the hazards of using ENMs in the oral cavity, and the latter should not prevent the responsible innovation of nanotechnology in dentistry. However, the clinical safety regulations for dental materials have not been specifically updated for ENMs, and some guidance on occupational health for practitioners is also needed. Knowledge gaps for future research include the formation of protein corona in the oral cavity, ENM diffusion through clinically relevant biofilms, and mechanistic investigations on how ENMs strengthen the tooth structure.
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Affiliation(s)
| | - Tracy De Peralta
- ‡Plymouth University Peninsula Dental School, University of Plymouth, John Bull Building, Tamar Science Park, Plymouth PL6 8BU, U.K
| | - Christopher J Tredwin
- ‡Plymouth University Peninsula Dental School, University of Plymouth, John Bull Building, Tamar Science Park, Plymouth PL6 8BU, U.K
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105
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Halloysite nanotube incorporation into adhesive systems—effect on bond strength to human dentin. Clin Oral Investig 2015; 19:1905-12. [DOI: 10.1007/s00784-015-1413-8] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2014] [Accepted: 01/21/2015] [Indexed: 11/26/2022]
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106
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Prajatelistia E, Lim C, Oh DX, Jun SH, Hwang DS. Chitosan and hydroxyapatite composite cross-linked by dopamine has improved anisotropic hydroxyapatite growth and wet mechanical properties. Eng Life Sci 2015. [DOI: 10.1002/elsc.201400194] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Affiliation(s)
- Ekavianty Prajatelistia
- School of Interdisciplinary Bioscience and Bioengineering; Pohang University of Science and Technology; Pohang Korea
| | - Chanoong Lim
- School of Interdisciplinary Bioscience and Bioengineering; Pohang University of Science and Technology; Pohang Korea
| | - Dongyeop X. Oh
- POSTECH Ocean Science and Technology Institute; Pohang University of Science and Technology; Pohang Korea
| | - Sang Ho Jun
- Division of Oral and Maxillofacial Surgery; Department of Dentistry; Korea University Anam Hospital; Seoul Korea
| | - Dong Soo Hwang
- School of Interdisciplinary Bioscience and Bioengineering; Pohang University of Science and Technology; Pohang Korea
- POSTECH Ocean Science and Technology Institute; Pohang University of Science and Technology; Pohang Korea
- Integrative Bioscience and Bioengineering; Pohang University of Science and Technology; Pohang Korea
- School of Environmental Science and Engineering; Pohang University of Science and Technology; Pohang Korea
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107
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Mechanical properties of dental resin/composite containing urchin-like hydroxyapatite. Dent Mater 2014; 30:1358-68. [DOI: 10.1016/j.dental.2014.10.003] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2013] [Revised: 03/29/2014] [Accepted: 10/15/2014] [Indexed: 11/21/2022]
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108
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Affiliation(s)
- Yingying Zhang
- School of Materials Science and Engineering, Jiangsu Key Laboratory for Advanced Metallic Materials, Southeast University, Nanjing, P. R. China
| | - Yinsheng Dong
- School of Materials Science and Engineering, Jiangsu Key Laboratory for Advanced Metallic Materials, Southeast University, Nanjing, P. R. China
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109
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Belli R, Kreppel S, Petschelt A, Hornberger H, Boccaccini AR, Lohbauer U. Strengthening of dental adhesives via particle reinforcement. J Mech Behav Biomed Mater 2014; 37:100-8. [DOI: 10.1016/j.jmbbm.2014.05.007] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2014] [Revised: 04/24/2014] [Accepted: 05/03/2014] [Indexed: 10/25/2022]
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110
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Mahmoodi M, Hashemi PM, Imani R. Characterization of a novel nanobiomaterial fabricated from HA, TiO 2 and Al 2O 3 powders: an in vitro study. Prog Biomater 2014; 3:25. [PMID: 29470734 PMCID: PMC5151102 DOI: 10.1007/s40204-014-0025-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2014] [Accepted: 06/02/2014] [Indexed: 02/05/2023] Open
Abstract
For the purposes of this study, hydroxyapatite (HA)–Al2O3–TiO2 nanobiomaterial with significant surface properties and biocompatibility capable of forming surface apatite was fabricated by cold-press and sintering method. Samples were examined for hardness and porosity. The results showed that in terms of hardness and porosity, sample A (50 wt% TiO2–30 wt% HA–20 wt% Al2O3) was superior to sample B (30 wt% TiO2–50 wt% HA–20 wt% Al2O3), and also the density of nanobiomaterial was close to natural bone density. Bioactivity of the samples in a simulated body fluid (SBF) was investigated. Then, after immersing the samples in SBF solution for a period of 7 days, sample B exhibited greater ability to form calcium phosphate compounds on the surface as compared to sample A. In addition, in vitro studies showed that MG-67 osteoblast-like cells attached and spread on the samples surface. The results showed that cells proliferated in greater numbers on the sample B as compared to the sample A. Finally, X-ray diffraction, scanning electron microscopy, and energy-dispersive X-ray analysis were performed to identify phases, study microstructure, and determine percentage of elements, respectively. The results revealed that considering their different properties, both nanobiomaterials can be used in medical applications.
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Affiliation(s)
- Mahboobeh Mahmoodi
- Department of Materials and Mechanic, Yazd Branch, Islamic Azad University, Yazd, Iran.
| | - Peyman Mahmoodi Hashemi
- Department of Biomedical Engineering, College of Engineering and Technical, Yazd Science and Research Branch, Islamic Azad University, Yazd, Iran
| | - Rana Imani
- Biomaterial Group, Faculty of Biomedical Engineering, Amirkabir University of Technology, Tehran, Iran
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111
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Toledano M, Cabello I, Vílchez MAC, Fernández MA, Osorio R. Surface microanalysis and chemical imaging of early dentin remineralization. MICROSCOPY AND MICROANALYSIS : THE OFFICIAL JOURNAL OF MICROSCOPY SOCIETY OF AMERICA, MICROBEAM ANALYSIS SOCIETY, MICROSCOPICAL SOCIETY OF CANADA 2014; 20:245-256. [PMID: 24160361 DOI: 10.1017/s1431927613013639] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
This study reports physical and chemical changes that occur at early dentin remineralization stages. Extracted human third molars were sectioned to obtain dentin discs. After polishing the dentin surfaces, three groups were established: (1) untreated dentin (UD), (2) 37% phosphoric acid application for 15 s (partially demineralized dentin-PDD), and (3) 10% phosphoric acid for 12 h at 25° C (totally demineralized dentin-TDD). Five different remineralizing solutions were used: chlorhexidine (CHX), artificial saliva (AS), phosphate solution (PS), ZnCl2, and ZnO. Wettability (contact angle), ζ potential and Raman spectroscopy analysis were determined on dentin surfaces. Demineralization of dentin resulted in a higher contact angle. Wettability decreased after immersion in all solutions. ζ potential analysis showed dissimilar performance ranging from -6.21 mV (TDD + AS) up to 3.02 mV (PDD + PS). Raman analysis showed an increase in mineral components after immersing the dentin specimens, in terms of crystallinity, mineral content, and concentration. This confirmed the optimal incorporation and deposition of mineral on dentin collagen. Organic content reflected scarce changes, except in TDD that appeared partially denatured. Pyridinium, as an expression of cross-linking, appeared in all spectra except in specimens immersed in PS.
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Affiliation(s)
- Manuel Toledano
- Faculty of Dentistry, University of Granada, Dental Materials Section, Colegio Máximo de Cartuja s/n, 18071 Granada, Spain
| | - Inmaculada Cabello
- Faculty of Dentistry, University of Granada, Dental Materials Section, Colegio Máximo de Cartuja s/n, 18071 Granada, Spain
| | | | - Miguel Angel Fernández
- Faculty of Sciences, University of Granada, Applied Physics Section, Campus de Fuentenueva s/n, 18071 Granada, Spain
| | - Raquel Osorio
- Faculty of Dentistry, University of Granada, Dental Materials Section, Colegio Máximo de Cartuja s/n, 18071 Granada, Spain
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Jain S, Jain AP, Jain S, Gupta ON, Vaidya A. WITHDRAWN: Nanotechnology: An emerging area in the field of dentistry. J Dent Sci 2013. [DOI: 10.1016/j.jds.2013.08.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
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113
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Bottino MC, Batarseh G, Palasuk J, Alkatheeri MS, Windsor LJ, Platt JA. Nanotube-modified dentin adhesive—Physicochemical and dentin bonding characterizations. Dent Mater 2013; 29:1158-65. [DOI: 10.1016/j.dental.2013.08.211] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2013] [Revised: 07/23/2013] [Accepted: 08/27/2013] [Indexed: 02/05/2023]
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114
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Ma J, Xu Q, Zhou J, Zhang J, Zhang L, Tang H, Chen L. Synthesis and biological response of casein-based silica nano-composite film for drug delivery system. Colloids Surf B Biointerfaces 2013; 111:257-63. [DOI: 10.1016/j.colsurfb.2013.06.011] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2013] [Revised: 05/27/2013] [Accepted: 06/06/2013] [Indexed: 11/26/2022]
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115
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Yasaei M, Zamanian A, Moztarzadeh F, Ghaffari M, Mozafari M. Characteristics improvement of calcium hydroxide dental cement by hydroxyapatite nanoparticles. Part 1: Formulation and microstructure. Biotechnol Appl Biochem 2013; 60:502-9. [DOI: 10.1002/bab.1119] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2012] [Accepted: 04/05/2013] [Indexed: 11/12/2022]
Affiliation(s)
- Mana Yasaei
- Biomaterials Group, Faculty of Biomedical Engineering (Center of Excellence); Amirkabir University of Technology; Tehran Iran
| | - Ali Zamanian
- Nanotechnology and Advanced Materials Department; Materials and Energy Research Center; Karaj Iran
| | - Fathollah Moztarzadeh
- Biomaterials Group, Faculty of Biomedical Engineering (Center of Excellence); Amirkabir University of Technology; Tehran Iran
| | - Maryam Ghaffari
- Biomaterials Group, Faculty of Biomedical Engineering (Center of Excellence); Amirkabir University of Technology; Tehran Iran
| | - Masoud Mozafari
- Biomaterials Group, Faculty of Biomedical Engineering (Center of Excellence); Amirkabir University of Technology; Tehran Iran
- Helmerich Advanced Technology Research Center; School of Material Science and Engineering; Oklahoma State University; Tulsa OK USA
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116
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Akhavan A, Sodagar A, Mojtahedzadeh F, Sodagar K. Investigating the effect of incorporating nanosilver/nanohydroxyapatite particles on the shear bond strength of orthodontic adhesives. Acta Odontol Scand 2013; 71:1038-42. [PMID: 23294142 DOI: 10.3109/00016357.2012.741699] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
INTRODUCTION Development of clinically acceptable orthodontic adhesives with additional anti-microbial and remineralizing features could be undertaken only if their mechanical properties have also been considered. The purpose of this study was to investigate the effect of incorporating Silver and Hydroxyapatite (HA) nanoparticles on the shear bond strength (SBS) of an orthodontic adhesive. METHODS Silver and HA nanoparticles were prepared and inspected by scanning electron microscopy and EDAX analysis. The nanoparticles were added to the primer of Transbond XT in 1%, 5% and 10% silver concentrations. Each compound (along with a control) was used for bonding stainless steel brackets to 12 human premolars (48 in total) and the SBS of all samples, along with their ARI scores were measured. RESULTS The SBS of the control, 1%, 5% and 10% nanoparticle groups were 12.06 ± 5.48, 20.66 ± 5.72, 10.77 ± 8.16 and 5.40 ± 2.00 MPa, respectively. A significant difference existed between all study groups (p < 0.05), except for the control-5% and 5%-10% study groups (p = 0.99 and p = 0.35). There was no statistically significant difference in distribution of ARI scores across the study groups (p = 0.44). CONCLUSIONS Incorporation of silver/HA nanoparticles containing 5% and 1% silver maintains and increases the SBS of orthodontic adhesives, respectively, whereas increasing the amount of particles to 10% has an undesirable effect when compared to the control group.
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Affiliation(s)
- Azam Akhavan
- Radiation Applications Research School, Nuclear Science and Technology Research Institute, Tehran, Iran
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117
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Sadat-Shojai M, Khorasani MT, Dinpanah-Khoshdargi E, Jamshidi A. Synthesis methods for nanosized hydroxyapatite with diverse structures. Acta Biomater 2013; 9:7591-621. [PMID: 23583646 DOI: 10.1016/j.actbio.2013.04.012] [Citation(s) in RCA: 516] [Impact Index Per Article: 46.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2012] [Revised: 04/02/2013] [Accepted: 04/04/2013] [Indexed: 01/15/2023]
Abstract
Hydroxyapatite (HAp) is the major mineral constituent of vertebrate bones and teeth. It has been well documented that HAp nanoparticles can significantly increase the biocompatibility and bioactivity of man-made biomaterials. Over the past decade, HAp nanoparticles have therefore increasingly been in demand, and extensive efforts have been devoted to develop many synthetic routes, involving both scientifically and economically new features. Several investigations have also been made to determine how critical properties of HAp can be effectively controlled by varying the processing parameters. With such a wide variety of methods for the preparation of HAp nanoparticles, choosing a specific procedure to synthesize a well-defined powder can be laborious; accordingly, in the present review, we have summarized all the available information on the preparation methodologies of HAp, and highlighted the inherent advantages and disadvantages involved in each method. This article is focused on nanosized HAp, although recent articles on microsized particles, especially those assembled from nanoparticles and/or nanocrystals, have also been reviewed for comparison. We have also provided several scientific figures and discussed a number of critical issues and challenges which require further research and development.
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118
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Lezaja M, Veljovic DN, Jokic BM, Cvijovic-Alagic I, Zrilic MM, Miletic V. Effect of hydroxyapatite spheres, whiskers, and nanoparticles on mechanical properties of a model BisGMA/TEGDMA composite initially and after storage. J Biomed Mater Res B Appl Biomater 2013; 101:1469-76. [DOI: 10.1002/jbm.b.32967] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2013] [Revised: 04/12/2013] [Accepted: 04/21/2013] [Indexed: 11/11/2022]
Affiliation(s)
- Maja Lezaja
- School of Dental Medicine; University of Belgrade; Rankeova 4 11000 Belgrade Serbia
| | - Djordje N. Veljovic
- Faculty of Technology and Metallurgy; University of Belgrade; Karnegijeva 4 11120 Belgrade Serbia
| | - Bojan M. Jokic
- Faculty of Technology and Metallurgy; University of Belgrade; Karnegijeva 4 11120 Belgrade Serbia
| | - Ivana Cvijovic-Alagic
- Institute of Nuclear Science “Vinca”; University of Belgrade; P.O. Box 522, 11001 Belgrade Serbia
| | - Milorad M. Zrilic
- Faculty of Technology and Metallurgy; University of Belgrade; Karnegijeva 4 11120 Belgrade Serbia
| | - Vesna Miletic
- School of Dental Medicine; University of Belgrade; Rankeova 4 11000 Belgrade Serbia
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119
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Dong X, Ritts AC, Staller C, Yu Q, Chen M, Wang Y. Evaluation of plasma treatment effects on improving adhesive-dentin bonding by using the same tooth controls and varying cross-sectional surface areas. Eur J Oral Sci 2013; 121:355-62. [PMID: 23841788 DOI: 10.1111/eos.12052] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/20/2013] [Indexed: 11/30/2022]
Abstract
The objective of this study was to evaluate and verify the effectiveness of plasma treatment for improving adhesive-dentin interfacial bonding by performing microtensile bond-strength (μTBS) testing using the same-tooth controls and varying cross-sectional surface areas. Extracted unerupted human third molars were used after removal of the crowns to expose the dentin surface. One half of each dentin surface was treated with a non-thermal argon plasma brush, whilst the other was shielded with glass slide and used as an untreated control. Adper Single Bond Plus adhesive and Filtek Z250 dental composite were then applied as directed. The teeth thus prepared were further cut into micro-bar specimens, with cross-sectional sizes of 1 × 1 mm², 1 × 2 mm², and 1 × 3 mm², for μTBS testing. The test results showed that plasma-treated specimens gave substantially stronger adhesive-dentin bonding than their corresponding same-tooth controls. Compared with their untreated controls, plasma treatment gave statistically significant higher bonding strength for specimens with a cross-sectional area of 1 × 1 mm² and 1 × 2 mm², with mean increases of 30.8% and 45.1%, respectively. Interface examination using optical and electron microscopy verified that plasma treatment improved the quality of the adhesive-dentin interface by reducing defects/voids and increasing the resin tag length in dentin tubules.
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Affiliation(s)
- Xiaoqing Dong
- Department of Mechanical and Aerospace Engineering, Center for Surface Science and Plasma Technology, University of Missouri, Columbia, MO 65211, USA
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120
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Tavassoli Hojati S, Alaghemand H, Hamze F, Ahmadian Babaki F, Rajab-Nia R, Rezvani MB, Kaviani M, Atai M. Antibacterial, physical and mechanical properties of flowable resin composites containing zinc oxide nanoparticles. Dent Mater 2013; 29:495-505. [PMID: 23562673 DOI: 10.1016/j.dental.2013.03.011] [Citation(s) in RCA: 149] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2012] [Revised: 02/21/2013] [Accepted: 03/04/2013] [Indexed: 10/27/2022]
Abstract
OBJECTIVES The aim of this study is evaluating the antibacterial activity of resin composites containing ZnO nanoparticles against Streptococcus mutans and examining their physical and mechanical properties. METHODS The properties of flowable resin composites containing 0-5wt.% nano-ZnO are investigated using different tests: RESULTS Although the agar diffusion test reveals no significant difference between the groups, the direct contact test demonstrates that by increasing the nanoparticle content, the bacterial growth is significantly diminished (p<0.05). In the aging test, however, the antibacterial properties reduce significantly (p<0.05). The flexural strength and compressive modulus remains unchanged by incorporation of nanoparticles (p>0.05) while the compressive strength and flexural modulus significantly increase (p<0.05). The ZnO containing resins show significantly lower depth of cure (p<0.05), and higher bond strength (p<0.05). There is no significant difference between the degrees of conversion, measured by FTIR technique, of the groups (p>0.05). SIGNIFICANCE Production of a dental resin composite with antibacterial activity without significant sacrificing effect on the mechanical properties is desirable in dental material science.
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121
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Sadat-Shojai M, Khorasani MT, Jamshidi A, Irani S. Nano-hydroxyapatite reinforced polyhydroxybutyrate composites: a comprehensive study on the structural and in vitro biological properties. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2013; 33:2776-87. [PMID: 23623096 DOI: 10.1016/j.msec.2013.02.041] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2012] [Accepted: 02/23/2013] [Indexed: 11/28/2022]
Abstract
Nanocomposites based on polyhydroxybutyrate (PHB) and hydroxyapatite (HAp) have recently been proposed for application in bone repair and regeneration, but very limited studies have investigated the effect of HAp on the rheological and thermal behavior of PHB. More important, the efficiency of a biomaterial depends greatly on its ability to interact with cells, but little is known about this interaction for this kind of nanocomposite. Hence, this paper dealt with some of the characteristics of solution-casted PHB/HAp nanocomposite films, and tried to explore the effect of HAp nanoparticles on cellular responses. The results showed that both rheological and thermal properties can be tailored by incorporating appropriate amounts of nanoparticles. In vitro studies showed a significant increase in proliferation and differentiation of MC3T3-E1 on nanocomposites compared to the neat polymer. Surface examination indicated that topography and chemistry of surface are important factors influencing cellular processes; while no cell differentiation was found on the neat polymer, nanocomposite with 15 wt.% filler content exhibited a pronounced differentiation resulting from high surface roughness and large amount of exposed HAp. These results suggest that HAp particles play a much more important role in determining the biological performance of PHB than has previously been supposed.
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Affiliation(s)
- Mehdi Sadat-Shojai
- Department of Biomaterials, Iran Polymer and Petrochemical Institute, P.O. Box 14965/115, Tehran, Iran.
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Leitune VCB, Collares FM, Takimi A, Lima GBD, Petzhold CL, Bergmann CP, Samuel SMW. Niobium pentoxide as a novel filler for dental adhesive resin. J Dent 2013; 41:106-13. [DOI: 10.1016/j.jdent.2012.04.022] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2012] [Revised: 04/18/2012] [Accepted: 04/20/2012] [Indexed: 10/28/2022] Open
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Leitune VCB, Collares FM, Trommer RM, Andrioli DG, Bergmann CP, Samuel SMW. The addition of nanostructured hydroxyapatite to an experimental adhesive resin. J Dent 2013; 41:321-7. [PMID: 23313828 DOI: 10.1016/j.jdent.2013.01.001] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2012] [Revised: 12/15/2012] [Accepted: 01/02/2013] [Indexed: 12/14/2022] Open
Abstract
OBJECTIVES Was produced nanostructured hydroxyapatite (HAnano) and evaluated the influence of its incorporation in an adhesive resin. METHODS HAnano was produced by a flame-based process and was characterized by scanning electron microscopy. The surface area, particle size, micro-Raman and cytotoxicity were evaluated. The organic phase was formulated by mixing 50 wt.% Bis-GMA, 25 wt.% TEGDMA, and 25 wt.% HEMA. HAnano was added at seven different concentrations: 0; 0.5; 1; 2; 5; 10 and 20 wt.%. Adhesive resins with hydroxyapatite incorporation were evaluated for their radiopacity, degree of conversion, flexural strength, softening in solvent and microshear bond strength. The data were analyzed by one-way ANOVA and Tukey's post hoc test (α=0.05), except for softening in solvent (paired t-test) and cytotoxicity (two-way ANOVA and Bonferroni). RESULTS HAnano presented 15.096 m(2)/g of specific surface area and a mean size of 26.7 nm. The radiopacity values were not different from those of 1-mm aluminium. The degree of conversion ranged from 52.2 to 63.8%. The incorporation of HAnano did not influence the flexural strength, which ranged from 123.3 to 143.4MPa. The percentage of reduction of the microhardness after immersion in the solvent became lower as the HAnano concentration increased. The addition of 2% nanostructured hydroxyapatite resulted in a higher value of microshear bond strength than the control group (p<0.05). CONCLUSIONS The incorporation of 2% of nanostructured hydroxyapatite into an adhesive resin presented the best results. CLINICAL SIGNIFICANCE The incorporation of nanostructured hydroxyapatite increases the adhesive properties and may be a promising filler for adhesive resin.
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Yang YH, Liu CH, Liang YH, Lin FH, Wu KCW. Hollow mesoporous hydroxyapatite nanoparticles (hmHANPs) with enhanced drug loading and pH-responsive release properties for intracellular drug delivery. J Mater Chem B 2013; 1:2447-2450. [DOI: 10.1039/c3tb20365d] [Citation(s) in RCA: 137] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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Shear bond strengths and morphological evaluation of filled and unfilled adhesive interfaces to enamel and dentine. Int J Dent 2012; 2012:858459. [PMID: 23209471 PMCID: PMC3502849 DOI: 10.1155/2012/858459] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2012] [Revised: 09/24/2012] [Accepted: 09/28/2012] [Indexed: 11/17/2022] Open
Abstract
In this laboratory study shear bond strengths of three filled and one unfilled adhesive systems to enamel and dentine were compared. Forty-eight extracted intact noncarious human mandibular molars were randomly assigned to two groups of 24 one for bonding to enamel and the other for bonding to dentine. Buccal and lingual surfaces of each tooth were randomly assigned for application of each one of filled (Prime & Bond NT (PBNT), Optibond Solo Plus (OBSP), and Clearfil SE Bond (CSEB)) and unfilled (Single Bond (SB)) adhesive systems (n = 12). A universal resin composite was placed into the translucent plastic cylinders (3 mm in diameter and 2 mm in length) and seated against the enamel and dentine surfaces and polymerized for 40 seconds. Shear bond strength was determined using a universal testing machine, and the results were statistically analyzed using two-way ANOVA, one-way ANOVA, t-test, and Tukey HSD post hoc test with a 5% level of significance.There were no statistically significant differences in bond strength between the adhesive systems in enamel, but CSEB and SB exhibited significantly higher and lower bond strength to dentine, respectively, than the other tested adhesive systems while there were no statistically significant differences between PBNT and OBSP.
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A novel dentin bonding system containing poly(methacrylic acid) grafted nanoclay: synthesis, characterization and properties. Dent Mater 2012; 28:1041-50. [PMID: 22795491 DOI: 10.1016/j.dental.2012.06.004] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2012] [Revised: 06/04/2012] [Accepted: 06/18/2012] [Indexed: 10/28/2022]
Abstract
OBJECTIVES Developing a novel dentin bonding system containing poly(methacrylic acid)-grafted-nanoclay (PMAA-g-nanoclay) as reinforcing filler, with high stability of nanoparticle dispersion and improved bond strength and mechanical properties were the main objectives of this study. MATERIALS AND METHODS Poly(methacrylic acid) (PMAA) was grafted onto the pristine sodium montmorrillonite (Na-MMT) nanoclay surface and characterized using FTIR, TGA, and X-ray diffraction (XRD). The PMAA-g-nanoclay was incorporated into an experimental dentin bonding system as filler in different concentrations and stability of nanoclay dispersion in the dilute adhesive, morphology of nanoclay layers in the photocured adhesive matrix, shear bond strength to caries-free extracted human premolar teeth, and mode of failure were studied. The mechanical properties including diametral tensile strength (DTS), flexural strength (FS), and flexural modulus (FM) were also investigated. The measured FM was also compared to theoretical prediction models. RESULTS The grafting of PMAA onto the nanoclay surface was confirmed and the results revealed a partially exfoliated structure for PMAA-g-nanoclay. The dispersion stability of the modified nanoparticles in the dilute adhesive increased more than 45 times in comparison with the pristine nanoclay. The incorporation of 0.5wt.% PMAA-g-nanoclay to the adhesive resulted in a significant increase in microshear bond strength, DTS, and FS. Higher PMAA-g-nanoclay contents resulted in increased flexural modulus. The experimental flexural modulus was in good agreement with the Halpin-Tsai theoretical model. SIGNIFICANCE Incorporation of PMAA-g-nanoclay particles as novel functional fillers into dental adhesive could result in the development of bonding systems with improved physical, mechanical, and adhesion properties.
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Solhi L, Atai M, Nodehi A, Imani M, Ghaemi A, Khosravi K. Poly(acrylic acid) grafted montmorillonite as novel fillers for dental adhesives: Synthesis, characterization and properties of the adhesive. Dent Mater 2012; 28:369-77. [DOI: 10.1016/j.dental.2011.11.010] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2011] [Revised: 10/24/2011] [Accepted: 11/08/2011] [Indexed: 11/26/2022]
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Atai M, Pahlavan A, Moin N. Nano-porous thermally sintered nano silica as novel fillers for dental composites. Dent Mater 2012; 28:133-45. [DOI: 10.1016/j.dental.2011.10.015] [Citation(s) in RCA: 68] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2011] [Revised: 07/14/2011] [Accepted: 10/24/2011] [Indexed: 10/14/2022]
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Collares FM, Leitune VCB, Rostirolla FV, Trommer RM, Bergmann CP, Samuel SMW. Nanostructured hydroxyapatite as filler for methacrylate-based root canal sealers. Int Endod J 2011; 45:63-7. [DOI: 10.1111/j.1365-2591.2011.01948.x] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Dong Y, Gui Z, Jiang S, Hu Y, Zhou K. Carbonization of Poly(methyl methacrylate) by Incorporating Hydroxyapatite Nanorods during Thermal Degradation. Ind Eng Chem Res 2011. [DOI: 10.1021/ie200319e] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yangyang Dong
- State Key Laboratory of Fire Science and ‡Department of Chemistry, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui 230027, P.R. China
| | - Zhou Gui
- State Key Laboratory of Fire Science and ‡Department of Chemistry, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui 230027, P.R. China
| | - Saihua Jiang
- State Key Laboratory of Fire Science and ‡Department of Chemistry, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui 230027, P.R. China
| | - Yuan Hu
- State Key Laboratory of Fire Science and ‡Department of Chemistry, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui 230027, P.R. China
| | - Keqing Zhou
- State Key Laboratory of Fire Science and ‡Department of Chemistry, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui 230027, P.R. China
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Abstract
Strontium hydroxyapatite powders was prepared by the hydrothermal method using Sr(NO3)2 and (NH4)2HPO4 as reagents. Fourier transform infrared spectroscopy, X-ray diffraction, Transmission electron microscope, Energy dispersive X-ray, and Thermogravimetric-differential thermal analysis were employed to investigate the crystalline phase, chemical composition, morphology, and thermal stability of the Strontium hydroxyapatite. And the cytotoxicity of Strontium hydroxyapatite was analyzed through MTT assay. Results showed that Strontium hydroxyapatite prepared by hydrothermal Method has excellent crystal structure, good dispersion, high purity, and rod-like morphology with dimensions 200-500 nm in length and 20 nm in diameter. Meanwhile, the apatite has poor thermal stability. However, the apatite is cytocompatible and may have better biocompatibility, which can serve as strontium source incorporation into calcium phosphate cement and for bone repair.
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