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Olguín Y, Selva M, Benavente D, Orellana N, Montenegro I, Madrid A, Jaramillo-Pinto D, Otero MC, Corrales TP, Acevedo CA. Effect of Electrical Stimulation on PC12 Cells Cultured in Different Hydrogels: Basis for the Development of Biomaterials in Peripheral Nerve Tissue Engineering. Pharmaceutics 2023; 15:2760. [PMID: 38140099 PMCID: PMC10747664 DOI: 10.3390/pharmaceutics15122760] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2023] [Revised: 11/26/2023] [Accepted: 12/02/2023] [Indexed: 12/24/2023] Open
Abstract
Extensive damage to peripheral nerves is a health problem with few therapeutic alternatives. In this context, the development of tissue engineering seeks to obtain materials that can help recreate environments conducive to cellular development and functional repair of peripheral nerves. Different hydrogels have been studied and presented as alternatives for future treatments to emulate the morphological characteristics of nerves. Along with this, other research proposes the need to incorporate electrical stimuli into treatments as agents that promote cell growth and differentiation; however, no precedent correlates the simultaneous effects of the types of hydrogel and electrical stimuli. This research evaluates the neural differentiation of PC12 cells, relating the effect of collagen, alginate, GelMA, and PEGDA hydrogels with electrical stimulation modulated in four different ways. Our results show significant correlations for different cultivation conditions. Electrical stimuli significantly increase neural differentiation for specific experimental conditions dependent on electrical frequency, not voltage. These backgrounds allow new material treatment schemes to be formulated through electrical stimulation in peripheral nerve tissue engineering.
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Affiliation(s)
- Yusser Olguín
- Departamento de Química y Medio Ambiente, Universidad Técnica Federico Santa María, Avenida España 1680, Valparaíso 2390123, Chile
- Centro Científico y Tecnológico de Valparaíso (CCTVal), Universidad Técnica Federico Santa María, Avenida España 1680, Valparaíso 2390123, Chile; (D.B.); (C.A.A.)
- Centro de Biotecnología, Universidad Técnica Federico Santa María, Avenida España 1680, Valparaíso 2390123, Chile; (M.S.); (N.O.); (T.P.C.)
| | - Mónica Selva
- Centro de Biotecnología, Universidad Técnica Federico Santa María, Avenida España 1680, Valparaíso 2390123, Chile; (M.S.); (N.O.); (T.P.C.)
| | - Diego Benavente
- Centro Científico y Tecnológico de Valparaíso (CCTVal), Universidad Técnica Federico Santa María, Avenida España 1680, Valparaíso 2390123, Chile; (D.B.); (C.A.A.)
| | - Nicole Orellana
- Centro de Biotecnología, Universidad Técnica Federico Santa María, Avenida España 1680, Valparaíso 2390123, Chile; (M.S.); (N.O.); (T.P.C.)
| | - Ivan Montenegro
- Centro de Investigaciones Biomédicas, Escuela de Obstetricia, Facultad de Medicina, Universidad de Valparaíso, Angamos 655, Reñaca, Viña del Mar 2520000, Chile;
| | - Alejandro Madrid
- Laboratorio de Productos Naturales y Síntesis Orgánica (LPNSO), Departamento de Ciencias y Geografía, Facultad de Ciencias Naturales y Exactas, Universidad de Playa Ancha, Avda. Leopoldo Carvallo 270, Playa Ancha, Valparaíso 2390123, Chile;
| | - Diego Jaramillo-Pinto
- Departamento de Física, Universidad Técnica Federico Santa María, Avenida España 1680, Valparaíso 2390123, Chile;
- Millenium Nucleus in NanoBioPhysics (NNBP), Universidad Técnica Federico Santa María, Valparaíso 2390123, Chile
| | - María Carolina Otero
- Escuela de Química y Farmacia, Facultad de Medicina, Universidad Andres Bello, Republica 252, Santiago 8370071, Chile;
| | - Tomas P. Corrales
- Centro de Biotecnología, Universidad Técnica Federico Santa María, Avenida España 1680, Valparaíso 2390123, Chile; (M.S.); (N.O.); (T.P.C.)
- Departamento de Física, Universidad Técnica Federico Santa María, Avenida España 1680, Valparaíso 2390123, Chile;
- Millenium Nucleus in NanoBioPhysics (NNBP), Universidad Técnica Federico Santa María, Valparaíso 2390123, Chile
| | - Cristian A. Acevedo
- Centro Científico y Tecnológico de Valparaíso (CCTVal), Universidad Técnica Federico Santa María, Avenida España 1680, Valparaíso 2390123, Chile; (D.B.); (C.A.A.)
- Centro de Biotecnología, Universidad Técnica Federico Santa María, Avenida España 1680, Valparaíso 2390123, Chile; (M.S.); (N.O.); (T.P.C.)
- Departamento de Física, Universidad Técnica Federico Santa María, Avenida España 1680, Valparaíso 2390123, Chile;
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N N, Sandeep A H, Bhandari S, Solete P, Choudhari S. Comparative Analysis of the Surface Roughness of Class V Composite Restorations Using a Conventional Polishing System and Pre-contoured Cervical Matrices: An In Vitro Study. Cureus 2023; 15:e45901. [PMID: 37885495 PMCID: PMC10599089 DOI: 10.7759/cureus.45901] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2023] [Accepted: 09/25/2023] [Indexed: 10/28/2023] Open
Abstract
BACKGROUND Rough surfaces of restorations have an impact on the accumulation of plaque, unaesthetic contour, and marginal adaptation, thereby affecting their functional, aesthetic, and clinical performance and the long-term stability of the restoration. Several polishing systems are currently in use for composite restorations, but information on their impact on surface roughness is limited. The present study aimed to determine the surface roughness of class V composite restorations polished using pre-contoured cervical matrices and to compare it with a conventional disc polishing system. MATERIALS AND METHODS Twenty maxillary anterior teeth were collected and used in the study. Class V cavity preparation was done, and the cavities were restored with two types of composites (microhybrid and nanohybrid) from commercially available brands (Ivoclar and Dentsply) and finished and polished using two polishing systems (super-snap and pre-contoured cervical matrices). The evaluation of surface roughness was done using an atomic force microscope (AFM). RESULTS The surface roughness parameters (Ra-arithmetic mean/average line roughness and Sa-average surface roughness) of the class V cavities restored using pre-contoured cervical matrices were significantly lower for both the tested resin composites. CONCLUSION The surface roughness of Class V cavities restored using pre-contoured cervical matrix systems was significantly less for both microhybrid and nanohybrid composites.
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Affiliation(s)
- Neha N
- Conservative Dentistry and Endodontics, Saveetha Dental College and Hospitals, Saveetha Institute of Medical and Technical Sciences, Saveetha University, Chennai, IND
| | - Hima Sandeep A
- Conservative Dentistry and Endodontics, Saveetha Dental College and Hospitals, Saveetha Institute of Medical and Technical Sciences, Saveetha University, Chennai, IND
| | - Sarita Bhandari
- Conservative Dentistry and Endodontics, Saveetha Dental College and Hospitals, Saveetha Institute of Medical and Technical Sciences, Saveetha University, Chennai, IND
| | - Pradeep Solete
- Conservative Dentistry and Endodontics, Saveetha Dental College and Hospitals, Saveetha Institute of Medical and Technical Sciences, Saveetha University, Chennai, IND
| | - Sahil Choudhari
- Conservative Dentistry and Endodontics, Saveetha Dental College and Hospitals, Saveetha Institute of Medical and Technical Sciences, Saveetha University, Chennai, IND
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Jaikumar RA, Karthigeyan S, Ramesh Bhat TR, Naidu M, Praveen Raj GR, Natarajan S. Analysis of Surface Roughness and Three-dimensional Scanning Topography of Zirconia Implants before and after Photofunctionalization by Atomic Force Microscopy: An In Vitro Study. JOURNAL OF PHARMACY AND BIOALLIED SCIENCES 2021; 13:S766-S771. [PMID: 34447198 PMCID: PMC8375956 DOI: 10.4103/jpbs.jpbs_724_20] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2020] [Accepted: 11/25/2020] [Indexed: 11/26/2022] Open
Abstract
Aim: To analyze surface roughness and three-dimensional (3D) scanning topography parameters of zirconia implants before and after photofunctionalization by atomic force microscopy (AFM). Materials and Methods: Ten commercially available zirconia implants five each in the study and control group were taken. The study group was subjected to ultraviolet (UV) radiation for 48 h using the shorter wavelength of 254 nm. After washing all the implants with 70% alcohol and drying, 3D surface topography and roughness parameters were analyzed using CSC 17 probe AFM at three different magnifications 25 μm, 50 μm, and 80 μm, respectively. Results: The surface topography and calculated mean amplitude, spatial, and hybrid parameters of the study group were higher than the control group (P < 0.05) in all three magnifications. Up to scale depth and peak value for the study and control group were (−0.4–0.4: −2-1) (−0.75 to 0.6:−1–1.3) (−0.75-−0.5: −1.5-1.3) for the study and control group at 25, 50, and 80 μm magnification, respectively. This indicates that photofunctionalization increased surface roughness of Zirconia implants to desirable extent. Conclusion: There is a definite difference in the quantitative topographic characteristics with zirconia implants being microroughned after photofunctionalization (UV treatment).
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Affiliation(s)
- R Arun Jaikumar
- Department of Prosthodontics, Best Dental Science College, Madurai, Tamil Nadu, India
| | - Suma Karthigeyan
- Department of Prosthodontics, Rajah Mutiah Dental College, Chidambaram, Tamil Nadu, India
| | - T R Ramesh Bhat
- Department of Prosthodontics, Best Dental Science College, Madurai, Tamil Nadu, India
| | - Madhulika Naidu
- Department of Oral Medicine and Radiology, Best Dental Science College, Madurai, Tamil Nadu, India
| | - G R Praveen Raj
- Department of Prosthodontics, Vinayaka Mission Sankarachariya Dental College, Salem, Tamil Nadu, India
| | - Senthil Natarajan
- Department of Conservative Dentistry and Endodontics, Tagore Dental College, Rathinamangalam, Tamil Nadu, India
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Al Ankily M, Makkeyah F, Bakr M, Shamel M. Effect of different scaling methods and materials on the enamel surface topography: An in vitro SEM study. J Int Oral Health 2020. [DOI: 10.4103/jioh.jioh_121_20] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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Ruggeri FS, Šneideris T, Vendruscolo M, Knowles TPJ. Atomic force microscopy for single molecule characterisation of protein aggregation. Arch Biochem Biophys 2019; 664:134-148. [PMID: 30742801 PMCID: PMC6420408 DOI: 10.1016/j.abb.2019.02.001] [Citation(s) in RCA: 83] [Impact Index Per Article: 16.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2018] [Revised: 02/03/2019] [Accepted: 02/05/2019] [Indexed: 12/22/2022]
Abstract
The development of atomic force microscopy (AFM) has opened up a wide range of novel opportunities in nanoscience and new modalities of observation in complex biological systems. AFM imaging has been widely employed to resolve the complex and heterogeneous conformational states involved in protein aggregation at the single molecule scale and shed light onto the molecular basis of a variety of human pathologies, including neurodegenerative disorders. The study of individual macromolecules at nanoscale, however, remains challenging, especially when fully quantitative information is required. In this review, we first discuss the principles of AFM with a special emphasis on the fundamental factors defining its sensitivity and accuracy. We then review the fundamental parameters and approaches to work at the limit of AFM resolution in order to perform single molecule statistical analysis of biomolecules and nanoscale protein aggregates. This single molecule statistical approach has proved to be powerful to unravel the molecular and hierarchical assembly of the misfolded species present transiently during protein aggregation, to visualise their dynamics at the nanoscale, as well to study the structural properties of amyloid-inspired functional nanomaterials.
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Affiliation(s)
- Francesco Simone Ruggeri
- Centre for Misfolding Disease, Department of Chemistry, University of Cambridge, Cambridge, CB2 1EW, United Kingdom.
| | - Tomas Šneideris
- Centre for Misfolding Disease, Department of Chemistry, University of Cambridge, Cambridge, CB2 1EW, United Kingdom; Institute of Biotechnology, Life Sciences Center, Vilnius University, Vilnius, Lithuania
| | - Michele Vendruscolo
- Centre for Misfolding Disease, Department of Chemistry, University of Cambridge, Cambridge, CB2 1EW, United Kingdom
| | - Tuomas P J Knowles
- Centre for Misfolding Disease, Department of Chemistry, University of Cambridge, Cambridge, CB2 1EW, United Kingdom; Cavendish Laboratory, University of Cambridge, Cambridge, CB3 0HE, United Kingdom.
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Stylianou A, Kontomaris SV, Grant C, Alexandratou E. Atomic Force Microscopy on Biological Materials Related to Pathological Conditions. SCANNING 2019; 2019:8452851. [PMID: 31214274 PMCID: PMC6535871 DOI: 10.1155/2019/8452851] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2018] [Revised: 02/23/2019] [Accepted: 03/07/2019] [Indexed: 05/16/2023]
Abstract
Atomic force microscopy (AFM) is an easy-to-use, powerful, high-resolution microscope that allows the user to image any surface and under any aqueous condition. AFM has been used in the investigation of the structural and mechanical properties of a wide range of biological matters including biomolecules, biomaterials, cells, and tissues. It provides the capacity to acquire high-resolution images of biosamples at the nanoscale and allows at readily carrying out mechanical characterization. The capacity of AFM to image and interact with surfaces, under physiologically relevant conditions, is of great importance for realistic and accurate medical and pharmaceutical applications. The aim of this paper is to review recent trends of the use of AFM on biological materials related to health and sickness. First, we present AFM components and its different imaging modes and we continue with combined imaging and coupled AFM systems. Then, we discuss the use of AFM to nanocharacterize collagen, the major fibrous protein of the human body, which has been correlated with many pathological conditions. In the next section, AFM nanolevel surface characterization as a tool to detect possible pathological conditions such as osteoarthritis and cancer is presented. Finally, we demonstrate the use of AFM for studying other pathological conditions, such as Alzheimer's disease and human immunodeficiency virus (HIV), through the investigation of amyloid fibrils and viruses, respectively. Consequently, AFM stands out as the ideal research instrument for exploring the detection of pathological conditions even at very early stages, making it very attractive in the area of bio- and nanomedicine.
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Affiliation(s)
- Andreas Stylianou
- Cancer Biophysics Laboratory, Department of Mechanical and Manufacturing Engineering, University of Cyprus, Nicosia 2238, Cyprus
| | - Stylianos-Vasileios Kontomaris
- Mobile Radio Communications Laboratory, School of Electrical and Computer Engineering, National Technical University of Athens, Iroon Polytechniou, Athens 15780, Greece
- Athens Metropolitan College, Sorou 74, Marousi 15125, Greece
| | - Colin Grant
- Hitachi High-Technologies Europe, Techspace One, Keckwick Lane, Warrington WA4 4AB, UK
| | - Eleni Alexandratou
- Biomedical Optics and Applied Biophysics Laboratory, School of Electrical and Computer Engineering, National Technical University of Athens, Iroon Polytechniou, Athens 15780, Greece
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Núñez-Toldrà R, Martínez-Sarrà E, Gil-Recio C, Carrasco MÁ, Al Madhoun A, Montori S, Atari M. Dental pulp pluripotent-like stem cells (DPPSC), a new stem cell population with chromosomal stability and osteogenic capacity for biomaterials evaluation. BMC Cell Biol 2017; 18:21. [PMID: 28427322 PMCID: PMC5399345 DOI: 10.1186/s12860-017-0137-9] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2016] [Accepted: 04/12/2017] [Indexed: 12/31/2022] Open
Abstract
Background Biomaterials are widely used to regenerate or substitute bone tissue. In order to evaluate their potential use for clinical applications, these need to be tested and evaluated in vitro with cell culture models. Frequently, immortalized osteoblastic cell lines are used in these studies. However, their uncontrolled proliferation rate, phenotypic changes or aberrations in mitotic processes limits their use in long-term investigations. Recently, we described a new pluripotent-like subpopulation of dental pulp stem cells derived from the third molars (DPPSC) that shows genetic stability and shares some pluripotent characteristics with embryonic stem cells. In this study we aim to describe the use of DPPSC to test biomaterials, since we believe that the biomaterial cues will be more critical in order to enhance the differentiation of pluripotent stem cells. Methods The capacity of DPPSC to differentiate into osteogenic lineage was compared with human sarcoma osteogenic cell line (SAOS-2). Collagen and titanium were used to assess the cell behavior in commonly used biomaterials. The analyses were performed by flow cytometry, alkaline phosphatase and mineralization stains, RT-PCR, immunohistochemistry, scanning electron microscopy, Western blot and enzymatic activity. Moreover, the genetic stability was evaluated and compared before and after differentiation by short-comparative genomic hybridization (sCGH). Results DPPSC showed excellent differentiation into osteogenic lineages expressing bone-related markers similar to SAOS-2. When cells were cultured on biomaterials, DPPSC showed higher initial adhesion levels. Nevertheless, their osteogenic differentiation showed similar trend among both cell types. Interestingly, only DPPSC maintained a normal chromosomal dosage before and after differentiation on 2D monolayer and on biomaterials. Conclusions Taken together, these results promote the use of DPPSC as a new pluripotent-like cell model to evaluate the biocompatibility and the differentiation capacity of biomaterials used in bone regeneration. Electronic supplementary material The online version of this article (doi:10.1186/s12860-017-0137-9) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Raquel Núñez-Toldrà
- Regenerative Medicine Research Institute, Universitat Internacional de Catalunya, Barcelona, Spain.,Chair of Regenerative Implantology MIS-UIC, Barcelona, Spain
| | - Ester Martínez-Sarrà
- Regenerative Medicine Research Institute, Universitat Internacional de Catalunya, Barcelona, Spain.,Chair of Regenerative Implantology MIS-UIC, Barcelona, Spain
| | - Carlos Gil-Recio
- Regenerative Medicine Research Institute, Universitat Internacional de Catalunya, Barcelona, Spain.,Chair of Regenerative Implantology MIS-UIC, Barcelona, Spain
| | | | | | - Sheyla Montori
- Regenerative Medicine Research Institute, Universitat Internacional de Catalunya, Barcelona, Spain.,Chair of Regenerative Implantology MIS-UIC, Barcelona, Spain
| | - Maher Atari
- Regenerative Medicine Research Institute, Universitat Internacional de Catalunya, Barcelona, Spain. .,Chair of Regenerative Implantology MIS-UIC, Barcelona, Spain. .,Surgery and Oral Implantology Department, Universitat Internacional de Catalunya, Barcelona, Spain.
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Uskoković V, Wu VM. Calcium Phosphate as a Key Material for Socially Responsible Tissue Engineering. MATERIALS 2016; 9. [PMID: 27347359 PMCID: PMC4917371 DOI: 10.3390/ma9060434] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Socially responsible technologies are designed while taking into consideration the socioeconomic, geopolitical and environmental limitations of regions in which they will be implemented. In the medical context, this involves making therapeutic platforms more accessible and affordable to patients in poor regions of the world wherein a given disease is endemic. This often necessitates going against the reigning trend of making therapeutic nanoparticles ever more structurally complex and expensive. However, studies aimed at simplifying materials and formulations while maintaining the functionality and therapeutic response of their more complex counterparts seldom provoke a significant interest in the scientific community. In this review we demonstrate that such compositional simplifications are meaningful when it comes to the design of a solution for osteomyelitis, a disease that is in its natural, non-postoperative form particularly prevalent in the underdeveloped parts of the world wherein poverty, poor sanitary conditions, and chronically compromised defense lines of the immune system are the norm. We show that calcium phosphate nanoparticles, which are inexpensive to make, could be chemically designed to possess the same functionality as a hypothetic mixture additionally composed of: (a) a bone growth factor; (b) an antibiotic for prophylactic or anti-infective purposes; (c) a bisphosphonate as an antiresorptive compound; (d) a viral vector to enable the intracellular delivery of therapeutics; (e) a luminescent dye; (f) a radiographic component; (g) an imaging contrast agent; (h) a magnetic domain; and (i) polymers as viscous components enabling the injectability of the material and acting as carriers for the sustained release of a drug. In particular, calcium phosphates could: (a) produce tunable drug release profiles; (b) take the form of viscous and injectable, self-setting pastes; (c) be naturally osteo-inductive and inhibitory for osteoclastogenesis; (d) intracellularly deliver bioactive compounds; (e) accommodate an array of functional ions; (f) be processed into macroporous constructs for tissue engineering; and (g) be naturally antimicrobial. All in all, we see in calcium phosphates the presence of a protean nature whose therapeutic potentials have been barely tapped into.
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Affiliation(s)
- Vuk Uskoković
- Department of Bioengineering, University of Illinois, Chicago, IL 60607-7052, USA;
- Department of Biomedical and Pharmaceutical Sciences, Chapman University, Irvine, CA 92618-1908, USA
- Correspondence: or ; Tel.: +1-415-412-0233
| | - Victoria M. Wu
- Department of Bioengineering, University of Illinois, Chicago, IL 60607-7052, USA;
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Kumari CM, Bhat KM, Bansal R. Evaluation of surface roughness of different restorative composites after polishing using atomic force microscopy. J Conserv Dent 2016; 19:56-62. [PMID: 26957795 PMCID: PMC4760015 DOI: 10.4103/0972-0707.173200] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Abstract
INTRODUCTION Resin based composites are widely used aesthetic restorative materials in clinical restorative dentistry. The filler size and the percentage of fillers affects smooth surface, clinical durability, aesthetics, better optical properties, compatibility with natural enamel tissue, surface gloss, and preventing the discoloration of the restoration. The finishing and polishing of tooth-coloured restorations are necessary clinical steps for better aesthetics and longevity of restored teeth. AIM In this study nano composites were chosen, because these contain nano particles which provide better overall composites features, including the quality of polished surface. The aim of this study was to evaluate the surface roughness of different newer posterior composites. MATERIAL AND METHOD Five commercially available posterior restorative composite were tested in this study. All the specimens were polished with shofu multi step polishing system. After polishing the samples were all analyzed by atomic force microscopy which is used to study surface topography and surface morphology of materials. RESULTS The values of surface roughness of each specimen were statistically analyzed using Kruskal Wallis ANOVA, and Pair wise comparisons by Mann-Whitney U test setting the statistical significance at p ≤ 0.05. CONCLUSION Tetric Evo Ceram, Z350 exhibited less surface roughness compared to Ever X, Clearfil Majesty and Sure fil SDR. There was no statistical difference between groups regarding surface rough ness between groups.
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Affiliation(s)
- C Meena Kumari
- Department of Conservative Dentistry and Endodontics, M. M. College of Dental Sciences and Research, Mullana, Ambala, Haryana, India
| | - K Manohar Bhat
- Department of Pedodontia, Jaipur Dental College, Jaipur, Rajasthan, India
| | - Rahul Bansal
- Department of Conservative Dentistry and Endodontics, M. M. College of Dental Sciences and Research, Mullana, Ambala, Haryana, India
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Stylianou A, Yova D, Alexandratou E. Investigation of the influence of UV irradiation on collagen thin films by AFM imaging. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2014; 45:455-68. [PMID: 25491851 DOI: 10.1016/j.msec.2014.09.006] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2014] [Revised: 08/21/2014] [Accepted: 09/08/2014] [Indexed: 01/06/2023]
Abstract
Collagen is the major fibrous extracellular matrix protein and due to its unique properties, it has been widely used as biomaterial, scaffold and cell-substrate. The aim of the paper was to use Atomic Force Microscopy (AFM) in order to investigate well-characterized collagen thin films after ultraviolet light (UV) irradiation. The films were also used as in vitro culturing substrates in order to investigate the UV-induced alterations to fibroblasts. A special attention was given in the alteration on collagen D-periodicity. For short irradiation times, spectroscopy (fluorescence/absorption) studies demonstrated that photodegradation took place and AFM imaging showed alterations in surface roughness. Also, it was highlighted that UV-irradiation had different effects when it was applied on collagen solution than on films. Concerning fibroblast culturing, it was shown that fibroblast behavior was affected after UV irradiation of both collagen solution and films. Furthermore, after a long irradiation time, collagen fibrils were deformed revealing that collagen fibrils are consisting of multiple shells and D-periodicity occurred on both outer and inner shells. The clarification of the effects of UV light on collagen and the induced modifications of cell behavior on UV-irradiated collagen-based surfaces will contribute to the better understanding of cell-matrix interactions in the nanoscale and will assist in the appropriate use of UV light for sterilizing and photo-cross-linking applications.
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Affiliation(s)
- Andreas Stylianou
- Biomedical Optics and Applied Biophysics Laboratory, Division of Electromagnetics, Electrooptics and Electronic Materials, School of Electrical and Computer Engineering, National Technical University of Athens, 9 Iroon Polytechniou, Athens 15780 Greece.
| | - Dido Yova
- Biomedical Optics and Applied Biophysics Laboratory, Division of Electromagnetics, Electrooptics and Electronic Materials, School of Electrical and Computer Engineering, National Technical University of Athens, 9 Iroon Polytechniou, Athens 15780 Greece
| | - Eleni Alexandratou
- Biomedical Optics and Applied Biophysics Laboratory, Division of Electromagnetics, Electrooptics and Electronic Materials, School of Electrical and Computer Engineering, National Technical University of Athens, 9 Iroon Polytechniou, Athens 15780 Greece
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11
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Bastos AS, Spin-Neto R, Conte-Neto N, Galina K, Boeck-Neto RJ, Marcantonio C, Marcantonio E, Marcantonio E. Calvarial Autogenous Bone Graft for Maxillary Ridge and Sinus Reconstruction for Rehabilitation With Dental Implants. J ORAL IMPLANTOL 2014; 40:469-78. [DOI: 10.1563/aaid-joi-d-11-00090] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Autogenous bone grafting is the gold-standard technique for bone augmentation procedures prior to implant placement. If the amount of available intraoral donor bone is insufficient, it is necessary to harvest bone graft from extraoral sites, such as calvaria. Although this technique is well established, only a few case reports show the histological analysis of the grafted bone at the moment of implant placement. This article reports the case of a 48-year-old female patient with a critical atrophic maxillary ridge reconstructed using autogenous calvarial bone graft prior to implant placement, with clinical and histological evaluation. Bone was collected under general anesthesia from the parietal bone. The outer cortical originated the bone blocks, and the medullar bone layer between was collected to be used in the sinus augmentation procedure, together with 5 of the bone blocks triturated. Six months after bone augmentation, 8 implants were placed in the grafted area and 2 biopsies were retrieved (anterior and the posterior regions), allowing the visualization of the bone-remodeling process in the grafted areas. The patient had a stable recovery. Our results showed that although necrotic bone could still be seen in the outer layer of the grafted area, the interface between this necrotic bone and the already remodeled bone was consistent with biocompatibility. Two-year radiographic evaluation showed success of the grafts and the implants in supporting an esthetic and functionally stable prosthesis. Summarizing, calvarial bone grafts are a viable alternative for the attainment of adequate bone volume prior to implant placement.
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Affiliation(s)
- Alliny Souza Bastos
- Department of Periodontology, Araraquara Dental School, UNESP-Univ Estadual Paulista, Araraquara, São Paulo, Brazil
| | - Rubens Spin-Neto
- Department of Periodontology, Araraquara Dental School, UNESP-Univ Estadual Paulista, Araraquara, São Paulo, Brazil
- Department of Dentistry, Faculty of Health, Aarhus University, Aarhus, Denmark
| | - Nicolau Conte-Neto
- Department of Periodontology, Araraquara Dental School, UNESP-Univ Estadual Paulista, Araraquara, São Paulo, Brazil
| | | | - Rodolfo Jorge Boeck-Neto
- Department of Bucco-maxillo-facial Surgery, UNIARA–Centro Universitá rio de Araraquara, Araraquara, São Paulo, Brazil
| | - Cláudio Marcantonio
- FAEPO–Araraquara Foundation for Research and Education in Dentistry, Araraquara, São Paulo, Brazil
| | - Elcio Marcantonio
- Department of Bucco-maxillo-facial Surgery, UNESP–Univ Estadual Paulista, Araraquara Dental School, Araraquara, São Paulo, Brazil
| | - Elcio Marcantonio
- Department of Periodontology, Araraquara Dental School, UNESP-Univ Estadual Paulista, Araraquara, São Paulo, Brazil
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Bragazzi NL, Pechkova E, Nicolini C. Proteomics and Proteogenomics Approaches for Oral Diseases. ADVANCES IN PROTEIN CHEMISTRY AND STRUCTURAL BIOLOGY 2014; 95:125-62. [DOI: 10.1016/b978-0-12-800453-1.00004-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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Stylianou A, Yova D. Surface nanoscale imaging of collagen thin films by Atomic Force Microscopy. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2013; 33:2947-57. [DOI: 10.1016/j.msec.2013.03.029] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/16/2012] [Revised: 03/01/2013] [Accepted: 03/14/2013] [Indexed: 01/24/2023]
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14
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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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15
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16
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Salerno M, Giacomelli L, Larosa C. Biomaterials for the programming of cell growth in oral tissues: The possible role of APA. Bioinformation 2011; 5:291-3. [PMID: 21364837 PMCID: PMC3043349 DOI: 10.6026/97320630005291] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2010] [Accepted: 09/14/2010] [Indexed: 11/26/2022] Open
Abstract
Examples of programmed tissue response after the interaction of cells with biomaterials are a hot topic in current dental research. We propose here the use
of anodic porous alumina (APA) for the programming of cell growth in oral tissues. In particular, APA may trigger cell growth by the controlled release
of specific growth factors and/or ions. Moreover, APA may be used as a scaffold to promote generation of new tissue, due to the high interconnectivity of
pores and the high surface roughness displayed by this material.
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Affiliation(s)
- Marco Salerno
- Italian Institute of Technology, via Morego 30, I-16163 Bolzaneto (Genova), Italy
- Marco Salerno: Phone: 0039-010-71781444; Fax: 0039-010-72032
| | - Luca Giacomelli
- Tirrenian Stomatologic Institute, via Aurelia 335, I-55041 Lido di Camaiore (Lucca), Italy
| | - Claudio Larosa
- National Research Center, via De Marini 6, I-16149 Genova, Italy
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Lavenus S, Ricquier JC, Louarn G, Layrolle P. Cell interaction with nanopatterned surface of implants. Nanomedicine (Lond) 2010; 5:937-47. [PMID: 20735227 DOI: 10.2217/nnm.10.54] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
Abstract
Metals such as titanium and alloys are commonly used for manufacturing orthopedic and dental implants because their surface properties provide a biocompatible interface with peri-implant tissues. Strategies for modifying the nature of this interface frequently involve changes to the surface at the nanometer level, thereby affecting protein adsorption, cell-substrate interactions and tissue development. Recent methods to control these biological interactions at the nanometer scale on the surface of implants are reviewed. Future strategies to control peri-implant tissue healing are also discussed.
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Affiliation(s)
- Sandrine Lavenus
- Faculty of Medicine, Inserm, U957, LPRO, University of Nantes, 1 Rue Gaston Veil, 44042 Nantes cedex1, France
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18
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Giacomelli L, Derchi G, Frustaci A, Orlando B, Bruno O, Covani U, Barone A, De Santis D, Chiappelli F. Surface roughness of commercial composites after different polishing protocols: an analysis with atomic force microscopy. Open Dent J 2010; 4:191-4. [PMID: 21228920 PMCID: PMC3019617 DOI: 10.2174/1874210601004010191] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2010] [Revised: 06/04/2010] [Accepted: 07/06/2010] [Indexed: 11/22/2022] Open
Abstract
Background and Aims: Polishing may increase the surface roughness of composites, with a possible effect on bacterial growth and material properties. This preliminary in vitro study evaluates the effect of three different polishing systems (PoGo polishers, Enhance, Venus Supra) on six direct resin composites (Gradia Direct, Venus, Venus Diamond, Enamel Plus HFO, Tetric Evoceram, Filtek Supreme XT). Materials and Methods: For each composite, 12 square specimens were prepared: 9 specimens were polished, three for each different method, while three specimens were used as controls. Surface roughness was determined with AFM by measuring Root Mean Square (RMS) of average height. Results: PoGo polisher determined a significantly rougher surface, versus controls, in 5 out of 6 composites evaluated. Some significant differences from unpolished controls were observed also for Enhance polishing. Polishing with Venus Supra did not result in any significant difference in surface roughness versus controls. No differences were observed between different polishing systems. Conclusions: These preliminary results suggest that Venus Supra polishing system could determine a smoother composite surface if compared to the other polishing systems tested. On this basis, we are conducting an in vivo study to evaluate bacterial colonization on some combinations of composites and polishing protocols.
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Affiliation(s)
- Luca Giacomelli
- Tirrenian Stomatologic Institute, Lido di Camaiore (Lucca), Italy
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