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Thermoluminescence and optically stimulated luminescence properties of in-vitro aged dental porcelain. Radiat Phys Chem Oxf Engl 1993 2023. [DOI: 10.1016/j.radphyschem.2023.110758] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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Prabhakar V, Chidambaranathan AS, Balasubramanium M. Effect of Cathodic Arc Plasma Deposition on Shear Bond Strength between Palladium Cobalt Chromium Coated with Titanium Nitride and Titanium Aluminium Nitride with Ceramic. Contemp Clin Dent 2021; 12:49-54. [PMID: 33967538 PMCID: PMC8092097 DOI: 10.4103/ccd.ccd_79_20] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2020] [Revised: 05/17/2020] [Accepted: 06/17/2020] [Indexed: 11/19/2022] Open
Abstract
Background: The success of esthetic ceramo-metal restoration is strongly influenced by its bond strength. The success of ceramo-metal restoration is subjective to its bond strength. Aim and Objectives: The aim of this study is to evaluate the shear bond strength between palladium-based cobalt chromium (Co-Cr) alloy coated with titanium nitride (TiNi) and titanium aluminum nitride with feldspathic ceramics. Materials and Methods: According to the International Organization for standardization 9693; technical report 1,140,640 samples were prepared using Palladium-based Co-Cr alloy with ×4 vertical projection resting on 5 mm diameter base. The samples were divided into Group: A (control), Group: B (Sandblasted), Group: C (TiNi coated), and Group: D (titanium aluminum nitride coated by cathodic arc plasma deposition, following which feldspathic ceramic application was performed. Shear bond test was performed using universal testing machine and surface analysis was performed using scanning electron microscope. Results: The mean shear bond strength for Group A was 172.994 ± 3.739 N, Group B 209.485 ± 5.913 N, Group C 176.536 ± 4.780 N, and Group D 260.576 ± 16.351 N. Comparison within the groups was made using one-way ANOVA, and multiple group comparisons were made using Tukey's honestly significant difference Post hoc test where the P < 0.001was considered statistically significant. Conclusion: Palladium based Co-Cr alloy coated with titanium aluminum nitride by cathodic plasma arc deposition showed maximum shear bond strength with feldspathic ceramic compared to noncoated, sandblasted, and TiNi coated alloy.
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Affiliation(s)
- Vaishnavi Prabhakar
- Department of Prosthodontics, SRM Dental College, Chennai, Tamil Nadu, India
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Pandoleon P, Bakopoulou A, Papadopoulou L, Koidis P. Evaluation of the biological behaviour of various dental implant abutment materials on attachment and viability of human gingival fibroblasts. Dent Mater 2019; 35:1053-1063. [PMID: 31060818 DOI: 10.1016/j.dental.2019.04.010] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2018] [Revised: 04/18/2019] [Accepted: 04/21/2019] [Indexed: 12/13/2022]
Abstract
OBJECTIVE This study aimed to investigate the biological effects of yttria-stabilized zirconia (Y-TZP) compared to other dental implant abutment materials, i.e. lithium disilicate (LS2) and titanium alloy (Ti), as well as the effects of aging of Y-TZP on viability/proliferation and attachment properties of Human Gingival Fibroblasts (HGFs). METHODS Cylindrical specimens of each material were prepared as per manufacturer's instructions. Y-TZP specimens were divided into three groups: 1. no aging (Zr0), 2. aging for 5 h, 134 °C, 2 bars, 100% humidity (Zr5), 3. aging for 10 h under the same conditions (Zr10). Surface roughness was evaluated by optical profilometry; cell metabolic activity/viability by MTT assay, morphological changes by Scanning Electron Microscopy (SEM) and ratio of live/dead cells by confocal microscopy. RESULTS Results showed statistically significant reduction of HGF metabolic activity/viability in contact with Y-TZP after aging. Nevertheless, non-aged zirconia showed no significant differences compared with LS2, Ti and control cultures. In contrast, significant stimulation of cell metabolic activity/viability was observed in HGFs exposed to LS2 eluates. Differential morphological patterns were observed for HGF in contact with different materials/treatments, with obviously increased number of dead cells and sparser distribution of HGFs cultured on Zr10 specimens. These effects were not correlated with surface topography, since Y-TZP aging did not alter surface micro-roughness. SIGNIFICANCE These findings indicate that Y-TZP shows comparable biological properties to Ti and LS2 as implant abutment material. Nevertheless, Y-TZP aging might influence gingival cell attachment and proliferation properties, providing an alert to a potentially negative effect on the long-term maintenance of gingival architecture.
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Affiliation(s)
- Panagiotis Pandoleon
- Department of Prosthodontics, School of Dentistry, Faculty of Health Sciences, Aristotle University of Thessaloniki (A.U.Th), GR-54124, Thessaloniki, Greece
| | - Athina Bakopoulou
- Department of Prosthodontics, School of Dentistry, Faculty of Health Sciences, Aristotle University of Thessaloniki (A.U.Th), GR-54124, Thessaloniki, Greece
| | - Lambrini Papadopoulou
- Department of Mineralogy-Petrology-Ec. Geology, School of Geology, Faculty of Sciences, Aristotle University of Thessaloniki (A.U.Th), Greece
| | - Petros Koidis
- Department of Prosthodontics, School of Dentistry, Faculty of Health Sciences, Aristotle University of Thessaloniki (A.U.Th), GR-54124, Thessaloniki, Greece.
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Beketova A, Varitis S, Kontonasaki E, Zorba T, Papadopoulou L, Kantiranis N, Theodorou GS, Paraskevopoulos KM, Koidis P. Evaluation of the micro-mechanical and bioactive properties of bioactive glass-dental porcelain composite. J Mech Behav Biomed Mater 2018; 86:77-83. [PMID: 29957447 DOI: 10.1016/j.jmbbm.2018.06.019] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2018] [Revised: 06/08/2018] [Accepted: 06/12/2018] [Indexed: 02/06/2023]
Abstract
The aim of this study was to evaluate microhardness and elastic modulus of a novel sol-gel derived dental ceramic - 58S bioactive glass composite (BP67: Bioactive Glass:33.3%, Dental Ceramic:66.7%) BP671 material by micro-indentation and to investigate its microstructure and bioactivity. The research hypotheses were that the values of microhardness (1) and elastic modulus (2) of the novel bioceramic composite and the commercial dental ceramic will be of the same order. The experimental sol-gel derived ceramics showed similar microstructural characteristics to a commercial feldspathic porcelain, and presence of additional calcium phosphate phases, which contributed its bioactivity. The formation of an apatite-like layer on the materials' surface observed by Fourier Transform Infrared (FTIR)2 spectroscopy, X-ray Diffraction (XRD)3 and Scanning Electron Microscopy-Energy Dispersive Spectroscopy (SEM-EDS)4 techniques after 12 days of maintenance in Conventional Simulated Body Fluid (cSBF)5 solution. The BP67 exhibited values of microhardness and modulus of elasticity which were not statistically significant different compared to dental ceramic, indicating the adequate mechanical integrity of the material. The results of this study suggest that the novel bioactive composite could be potentially applied in prosthetic dentistry, while its thermal and optical properties should be investigated in future studies.
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Affiliation(s)
- Anastasia Beketova
- School of Health Sciences, Dentistry Department, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
| | - Savvas Varitis
- Physics Department, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
| | - Eleana Kontonasaki
- School of Health Sciences, Dentistry Department, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
| | - Triantafillia Zorba
- Physics Department, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
| | - Lambrini Papadopoulou
- Department of Geology, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
| | - Nikolaos Kantiranis
- Department of Geology, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
| | - Georgios S Theodorou
- Physics Department, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
| | | | - Petros Koidis
- School of Health Sciences, Dentistry Department, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece.
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Sakoda S, Nakao N, Watanabe I. The effect of abrading and cutting instruments on machinability of dental ceramics. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2018; 29:34. [PMID: 29549513 DOI: 10.1007/s10856-018-6031-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2017] [Accepted: 01/16/2018] [Indexed: 06/08/2023]
Abstract
The aim was to investigate the effect of machining instruments on machinability of dental ceramics. Four dental ceramics, including two zirconia ceramics were machined by three types (SiC, diamond vitrified, and diamond sintered) of wheels with a hand-piece engine and two types (diamond and carbide) of burs with a high-speed air turbine. The machining conditions used were abrading speeds of 10,000 and 15,000 r.p.m. with abrading force of 100 gf for the hand-piece engine, and a pressure of 200 kPa and a cutting force of 80 gf for the air-turbine hand-piece. The machinability efficiency was evaluated by volume losses after machining the ceramics. A high-abrading speed had high-abrading efficiency (high-volume loss) compared to low-abrading speed in all abrading instruments used. The diamond vitrified wheels demonstrated higher volume loss for two zirconia ceramics than those of SiC and diamond sintered wheels. When the high-speed air-turbine instruments were used, the diamond points showed higher volume losses compared to the carbide burs for one ceramic and two zirconia ceramics with high-mechanical properties. The results of this study indicated that the machinability of dental ceramics depends on the mechanical and physical properties of dental ceramics and machining instruments. The abrading wheels show autogenous action of abrasive grains, in which ground abrasive grains drop out from the binder during abrasion, then the binder follow to wear out, subsequently new abrasive grains come out onto the instrument surface (autogenous action) and increase the grinding amount (volume loss) of grinding materials.
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Affiliation(s)
- Satoshi Sakoda
- Department of Dental and Biomedical Materials Science, Nagasaki University Graduate School of Biomedical Sciences, 1-7-1 Sakamoto, Nagasaki, 852-8102, Japan
| | - Noriko Nakao
- Department Perioperative Oral Management, Nagasaki University Hospital, Nagasaki, 1-7-1 Sakamoto, Nagasaki, 852-8102, Japan
| | - Ikuya Watanabe
- Department of Dental and Biomedical Materials Science, Nagasaki University Graduate School of Biomedical Sciences, 1-7-1 Sakamoto, Nagasaki, 852-8102, Japan.
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Goudouri OM, Kontonasaki E, Papadopoulou L, Manda M, Kavouras P, Triantafyllidis KS, Stefanidou M, Koidis P, Paraskevopoulos KM. An experimental bioactive dental ceramic for metal-ceramic restorations: Textural characteristics and investigation of the mechanical properties. J Mech Behav Biomed Mater 2016; 66:95-103. [PMID: 27842244 DOI: 10.1016/j.jmbbm.2016.10.019] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2016] [Revised: 10/19/2016] [Accepted: 10/26/2016] [Indexed: 11/17/2022]
Abstract
The aim of this study was the evaluation of the textural characteristics of an experimental sol-gel derived feldspathic dental ceramic, which has already been proven bioactive and the investigation of its flexural strength through Weibull Statistical Analysis. The null hypothesis was that the flexural strength of the experimental and the commercial dental ceramic would be of the same order, resulting in a dental ceramic with apatite forming ability and adequate mechanical integrity. Although the flexural strength of the experimental ceramics was not statistically significant different compared to the commercial one, the amount of blind pores due to processing was greater. The textural characteristics of the experimental ceramic were in accordance with the standard low porosity levels reported for dental ceramics used for fixed prosthetic restorations. Feldspathic dental ceramics with typical textural characteristics and advanced mechanical properties as well as enhanced apatite forming ability can be synthesized through the sol-gel method.
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Affiliation(s)
| | - Eleana Kontonasaki
- School of Health Sciences, Dentistry Department, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
| | - Lambrini Papadopoulou
- Department of Geology, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
| | - Marianthi Manda
- School of Health Sciences, Dentistry Department, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
| | - Panagiotis Kavouras
- Research center of Advanced Unit Composites, Nano Materials and Nanotechnology, Department of Materials Science and Engineering, School of Chemical Engineering, National Technical University, Athens GR-157 80, Greece
| | | | - Maria Stefanidou
- Department of Civil Engineering, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
| | - Petros Koidis
- School of Health Sciences, Dentistry Department, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
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Singh A, Nagpal A, Pawah S, Pathak C, Issar G, Sharma P. Qualitative Assessment of Wear Resistance and Surface Hardness of Different Commercially Available Dental Porcelain: An in vitro Study. J Contemp Dent Pract 2016; 17:755-761. [PMID: 27733720 DOI: 10.5005/jp-journals-10024-1925] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
INTRODUCTION In an attempt to minimize wear damage to the enamel of antagonist teeth, new low and medium fusing ceramic materials have been developed. Manufacturers usually claim that these ceramics are wear-friendly because of their lower hardness, lower concentrations of crystal phase, and smaller crystal sizes. This study aimed to quantitatively analyze the wear strength of various commercially available dental porcelain with tooth enamel as well as the surface hardness of these dental porcelain. MATERIALS AND METHODS The basic model was designed as a pin on plate arrangement. The tooth specimens were mounted on the stylus which was centered on the ceramic specimen in a wear testing machine. The dental ceramic specimen was centered in the metal die. A load of 40 N was applied at a rate of 80 cycles/minute for 15 minutes. In the current study, mean wear depth (Ra) value, volumetric loss, and surface hardness were obtained by standard quantification method and were statistically evaluated. RESULTS Ceramco-3 was reported to be most abrasive for enamel; however, Duceram love significantly more abraded itself than the other two, Ceramco-3 and Vita Alpha, and generated the lowest loss of enamel. Also, same abrasive type of wear was revealed for all three variants of tested ceramics. CONCLUSION Ceramco-3 was the most abrasive for enamel, while surface roughness (mean wear depth) of Duceram love was maximum and for Ceramco-3 it was minimum. The value of surface roughness for Vita Alpha was in between Duceram love and Ceramco-3. Nonetheless, the mean surface hardness of Duceram love was found to be least and maximum for Vita Alpha. CLINICAL SIGNIFICANCE In situations of dental wear and wasting tooth disease (Attrition/Abrasion), Duceram can be applied in lieu of Ceramco-3 so as to prevent worsening of existing dentition. However, in younger patients Vita Alpha would offer maximum durability due to its greater surface hardness.
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Affiliation(s)
- Abhishek Singh
- Department of Prosthodontics, Sudha Rustagi College of Dental Sciences and Research, Faridabad, Haryana, India, Phone: +919818613206 e-mail:
| | - Abhishek Nagpal
- Department of Prosthodontics, ITS-CDSR Dental College and Hospital, Ghaziabad, Uttar Pradesh, India
| | - Salil Pawah
- Department of Prosthodontics, Sudha Rustagi College of Dental Sciences and Research, Faridabad, Haryana, India
| | - Chetan Pathak
- Department of Prosthodontics, Sudha Rustagi College of Dental Sciences and Research, Faridabad, Haryana, India
| | - Gaurav Issar
- Department of Prosthodontics, ITS-CDSR Dental College and Hospital, Ghaziabad, Uttar Pradesh, India
| | - Pankaj Sharma
- Department of Prosthodontics, Sudha Rustagi College of Dental Sciences and Research, Faridabad, Haryana, India
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Abbasi Z, Bahrololoum ME, Bagheri R, Shariat MH. Characterization of the bioactive and mechanical behavior of dental ceramic/sol–gel derived bioactive glass mixtures. J Mech Behav Biomed Mater 2016; 54:115-22. [DOI: 10.1016/j.jmbbm.2015.09.025] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2015] [Revised: 09/17/2015] [Accepted: 09/21/2015] [Indexed: 10/23/2022]
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Bae EJ, Kim JH, Kim WC, Kim HY. Bond and fracture strength of metal-ceramic restorations formed by selective laser sintering. J Adv Prosthodont 2014; 6:266-71. [PMID: 25177469 PMCID: PMC4146726 DOI: 10.4047/jap.2014.6.4.266] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2013] [Revised: 06/13/2014] [Accepted: 06/16/2014] [Indexed: 11/08/2022] Open
Abstract
PURPOSE The purpose of this study was to compare the fracture strength of the metal and the bond strength in metal-ceramic restorations produced by selective laser sintering (SLS) and by conventional casting (CAST). MATERIALS AND METHODS Non-precious alloy (StarLoy C, DeguDent, Hanau, Germany) was used in CAST group and metal powder (SP2, EOS GmbH, Munich, Germany) in SLS group. Metal specimens in the form of sheets (25.0 × 3.0 × 0.5 mm) were produced in accordance with ISO 9693:1999 standards (n=30). To measure the bond strength, ceramic was fired on a metal specimen and then three-point bending test was performed. In addition, the metal fracture strength was measured by continuing the application of the load. The values were statistically analyzed by performing independent t-tests (α=.05). RESULTS The mean bond strength of the SLS group (50.60 MPa) was higher than that of the CAST group (46.29 MPa), but there was no statistically significant difference. The metal fracture strength of the SLS group (1087.2 MPa) was lower than that of the CAST group (2399.1 MPa), and this difference was statistically significant. CONCLUSION In conclusion the balling phenomenon and the gap formation of the SLS process may increase the metal-ceramic bond strength.
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Affiliation(s)
- Eun-Jeong Bae
- Department of Dental Laboratory Science and Engineering, Korea University, Seoul, Republic of Korea
| | - Ji-Hwan Kim
- Department of Dental Laboratory Science and Engineering, Korea University, Seoul, Republic of Korea
| | - Woong-Chul Kim
- Department of Dental Laboratory Science and Engineering, Korea University, Seoul, Republic of Korea
| | - Hae-Young Kim
- Department of Dental Laboratory Science and Engineering, Korea University, Seoul, Republic of Korea
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Abstract
The objective of this study was to evaluate the potential of a survival prediction method for the assessment of ceramic dental restorations. For this purpose, fast-fracture and fatigue reliabilities for 2 bilayer (metal ceramic alloy core veneered with fluorapatite leucite glass-ceramic, d.Sign/d.Sign-67, by Ivoclar; glass-infiltrated alumina core veneered with feldspathic porcelain, VM7/In-Ceram Alumina, by Vita) and 3 monolithic (leucite-reinforced glass-ceramic, Empress, and ProCAD, by Ivoclar; lithium-disilicate glass-ceramic, Empress 2, by Ivoclar) single posterior crown restorations were predicted, and fatigue predictions were compared with the long-term clinical data presented in the literature. Both perfectly bonded and completely debonded cases were analyzed for evaluation of the influence of the adhesive/restoration bonding quality on estimations. Material constants and stress distributions required for predictions were calculated from biaxial tests and finite element analysis, respectively. Based on the predictions, In-Ceram Alumina presents the best fast-fracture resistance, and ProCAD presents a comparable resistance for perfect bonding; however, ProCAD shows a significant reduction of resistance in case of complete debonding. Nevertheless, it is still better than Empress and comparable with Empress 2. In-Ceram Alumina and d.Sign have the highest long-term reliability, with almost 100% survivability even after 10 years. When compared with clinical failure rates reported in the literature, predictions show a promising match with clinical data, and this indicates the soundness of the settings used in the proposed predictions.
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Affiliation(s)
- H Lekesiz
- Bursa Technical University, Department of Mechanical Engineering, Gaziakdemir Mah. Mudanya Cad. No: 4/10 Osmangazi, Bursa, Turkey
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Pinheiro JB, Reis AC, Pisani MX, Leite VMF, Souza RF, Paranhos HFO, Cláudia Helena SL. Microstructural characterization and evaluation of the properties of polymeric materials for maxillofacial prosthetics. J Med Eng Technol 2014; 38:67-75. [DOI: 10.3109/03091902.2013.864715] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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Elsaka SE. Influence of surface treatments on the surface properties of different zirconia cores and adhesion of zirconia-veneering ceramic systems. Dent Mater 2013; 29:e239-51. [DOI: 10.1016/j.dental.2013.07.003] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2012] [Revised: 12/03/2012] [Accepted: 07/02/2013] [Indexed: 11/16/2022]
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Sabbatini M, Boccafoschi F, Bosetti M, Cannas M. Adhesion and differentiation of neuronal cells on Zn-doped bioactive glasses. J Biomater Appl 2013; 28:708-18. [DOI: 10.1177/0885328212474944] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
To verify the compatibility of rigid supports with neuronal cells for biomechanical application, we have evaluated the biocompatibility of Zn-doped bioglasses versus neuronal cell line SKNBE. Undifferentiated and retinoic acid-differentiated cells were used. We have observed that bioglasses doped with low concentration of Zn favored cell adhesion and proliferation of undifferentiated SKNBE neuronal cells, while the high Zn concentration strongly interfered with cell proliferation. Instead the high Zn concentration lightly stimulates the adhesive and strongly stimulates the phenotype characterization of differentiated SKNBE cells. Focal contact sites were observed in cells performing spread adhesive morphology, while they were down-regulated in cells performing differentiation behavior. GAP-43 and neurofilament were expressed in differentiated cells. However, GAP-43 was also found to be expressed in undifferentiated cells, where its expression seems related to proliferative behavior of cells. This work evidenced the importance of the biomaterial chemical structure in influencing proliferation or differentiation pathways of neuronal cells.
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Affiliation(s)
- Maurizio Sabbatini
- Department of Health Sciences, Research Centre of Biocompatibility and Tissue Engineering, Novara, Italy
| | - Francesca Boccafoschi
- Department of Health Sciences, Research Centre of Biocompatibility and Tissue Engineering, Novara, Italy
| | - Michela Bosetti
- Department of Pharmaceutical Sciences, University of Eastern Piedmont “A. Avogadro”, Novara, Italy
| | - Mario Cannas
- Department of Health Sciences, Research Centre of Biocompatibility and Tissue Engineering, Novara, Italy
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Tang X, Nakamura T, Usami H, Wakabayashi K, Yatani H. Effects of multiple firings on the mechanical properties and microstructure of veneering ceramics for zirconia frameworks. J Dent 2012; 40:372-80. [DOI: 10.1016/j.jdent.2012.01.014] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2011] [Revised: 01/26/2012] [Accepted: 01/27/2012] [Indexed: 10/14/2022] Open
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Pressed ceramics onto zirconia. Part 1: Comparison of crystalline phases present, adhesion to a zirconia system and flexural strength. Dent Mater 2011; 27:1204-12. [DOI: 10.1016/j.dental.2011.08.006] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2010] [Revised: 06/14/2011] [Accepted: 08/17/2011] [Indexed: 11/21/2022]
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Wang X, Xia Y, Liu L, Liu M, Gu N, Guang H, Zhang F. Comparison of MTT assay, flow cytometry, and RT-PCR in the evaluation of cytotoxicity of five prosthodontic materials. J Biomed Mater Res B Appl Biomater 2011; 95:357-64. [PMID: 20878925 DOI: 10.1002/jbm.b.31723] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
In the present study, the cytotoxic effects of five prosthodontic materials on the L929 cell line were assessed by flow cytometry (FCM), reverse transcription PCR (RT-PCR), and MTT (3-(4,5-dimethylthiazole-2-yl)-2,5-diphenyltetrazoli-umbromide) assay. The cells were treated with eluates resin (RE), pressable ceramics (PC), Co-Cr alloy-porcelain (CC), Ni-Cr alloy-porcelain (NC), and diatomite ceramics (DC). The cytotoxicity of all the materials tested by the MTT assay was grade 1. By FCM analysis, apoptosis rates of DC and PC were low, with no significant difference from the control (p > 0.05). The rest of the groups induced much higher apoptosis rates (p < 0.05), with the highest in the RE group. The necrotic cell levels of RE was also significantly increased (p < 0.05). Bcl-2 and Bax mRNA expression were determined by RT-PCR, and the Bax/Bcl-2 ratio in the DC and PC groups were not significantly different from the control (p > 0.05), whereas CC, NC, and RE groups showed significant differences (p < 0.05). Taken together, the results suggest that FCM and RT-PCR analyses can supplement the traditional MTT assay in evaluating the cytotoxicity of prosthodontic materials for selecting highly biocompatible materials.
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Affiliation(s)
- Xue Wang
- Institute of Stomatology, Nanjing Medical University, Nanjing 210029, China
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Boeckler AF, Lee H, Psoch A, Setz JM. Prospective Observation of CAD/CAM Titanium-Ceramic-Fixed Partial Dentures: 3-Year Follow-Up. J Prosthodont 2010; 19:592-7. [PMID: 20723013 DOI: 10.1111/j.1532-849x.2010.00638.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Affiliation(s)
- Arne F Boeckler
- Department of Prosthodontics, Martin-Luther-University Halle-Wittenberg, Center for Dentistry and Oral Medicine, Halle, Germany.
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Sol–gel based fabrication of novel glass-ceramics and composites for dental applications. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2010. [DOI: 10.1016/j.msec.2010.03.005] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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KUKIATTRAKOON B, HENGTRAKOOL C, KEDJARUNE-LEGGAT U. Degradability of fluorapatite-leucite ceramics in naturally acidic agents. Dent Mater J 2010; 29:502-11. [PMID: 20827032 DOI: 10.4012/dmj.2009-111] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Kukiattrakoon B, Hengtrakool C, Kedjarune-Leggat U. Chemical durability and microhardness of dental ceramics immersed in acidic agents. Acta Odontol Scand 2010; 68:1-10. [PMID: 19878041 DOI: 10.3109/00016350903251321] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
OBJECTIVE To evaluate the microhardness and surface elemental compositions of ceramics immersed in acidic agents. MATERIAL AND METHODS Thirty-five ceramic disc specimens were made from each of four types of ceramic (VMK 95, Vitadur Alpha, Empress Esthetic and IPS e.max Ceram). Before immersion, baseline data of Vicker's microhardness and elemental composition were recorded. Four groups of discs (seven per group) were then immersed in acidic agents (citrate buffer solution, pineapple juice and green mango juice) and deionized water (as a control) for 168 h at 37 degrees C. One group was immersed in 4% acetic acid at 80 degrees C for 168 h. After immersion, specimens were evaluated and data were analyzed using two-way ANOVA with repeated measurements and a paired t-test at a significance level of 0.05. RESULTS The microhardness values of four types of ceramic significantly decreased after being immersed in acidic agents (p < 0.05). The elemental compositions of ceramics mainly comprise silicon, aluminium and potassium. These compositions also decreased after immersion (p < 0.05). CONCLUSIONS The acidic agents used in this study affected the microhardness and elemental dissolution of ceramics. The main elemental compositions of ceramics (silicon, aluminium and potassium) decreased after being immersed in acidic agents.
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Affiliation(s)
- Boonlert Kukiattrakoon
- Department of Conservative Dentistry, Faculty of Dentistry, Prince of Songkla University, Hat Yai, Songkhla, Thailand.
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Kukiattrakoon B, Junpoom P, Hengtrakool C. Vicker's microhardness and energy dispersive x-ray analysis of fluorapatite-leucite and fluorapatite ceramics cyclically immersed in acidic agents. J Oral Sci 2009; 51:443-50. [PMID: 19776513 DOI: 10.2334/josnusd.51.443] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
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