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Moayedifar R, Angleitner P, Gökler J, Osorio E, Horvat J, Atteneder C, Aliabadi-Zuckermann A, Laufer G, Zuckermann A. Austrian Analysis of the GUARDIAN Registry: Heart Transplant Effects in Europe from the Global Pandemic. J Heart Lung Transplant 2022. [PMCID: PMC9364676 DOI: 10.1016/j.healun.2022.01.116] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
Abstract
Purpose Methods Results Conclusion
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Toledano M, Aguilera FS, Cabello I, Toledano-Osorio M, Osorio E, López-López MT, García-Godoy F, Lynch CD, Osorio R. Silver-loaded nanoparticles affect ex-vivo mechanical behavior and mineralization of dentin. Med Oral Patol Oral Cir Bucal 2019; 24:e156-e164. [PMID: 30818307 PMCID: PMC6441607 DOI: 10.4317/medoral.22885] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2018] [Accepted: 01/22/2019] [Indexed: 12/04/2022] Open
Abstract
Background The aim was to evaluate the effect of silver loaded nanoparticles (NPs) application on the triboscopic, crystallographic and viscoelastic properties of demineralized dentin. Polymethylmetacrylate-based NPs and Ag loaded NPs were applied on demineralized dentin. Material and Methods Treated and untreated surfaces were probed by a nanoindenter to test viscoelasticity, and by atomic force microscopy to test nanoroughness and collagen fibril diameter. X-ray diffraction and transmission electron microscopy through selected area diffraction and bright-field imaging were also used. Results Dentin treated with Ag-NPs attained the lowest complex modulus, and the highest tan delta values after 7 days of storage. Dentin treated with undoped-NPs achieved the lowest nanoroughness and the greatest collagen bandwidths among groups. Crystals were identified as hydroxyapatite with the highest crystallographic maturity and crystallite size in dentin treated with undoped-NPs. Texture increased in all samples from 24 h to 7 d, except in dentin surfaces treated with Ag-NPs at 310 plane. Polyhedral, block-like, hexagonal or plate-like shaped apatite crystals constituted the bulk of minerals in dentin treated with Ag-NPs, after 7 d. Polyhedral or rounded/drop-like, and polymorphic in strata crystal apatite characterized the minerals when undoped-NPs were used, with more crystalline characteristics after 7 d than that found when Ag-NPs were applied. Ag-NPs application did not improve the mechanical performance of dentin and did not produce dentin remineralization. However, energy was dissipated through the dentin without showing stress concentration; contrary was occurring at dentin treated with undoped-NPs, that provoked bridge-like mineral deposits at the dentin surface. Conclusions Ag-NPs application did not enhance the mechanical properties of cervical dentin, though the energy dissipation did not damage the dentin structure. Remineralization at dentin was not produced after Ag-NPs application, though improved crystallinity may lead to increase stability of the apatite that was generated at the dentin surface. Key words:Dentin, mechanical, mineralization, roughness, silver, viscoelastic.
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Affiliation(s)
- M Toledano
- University of Granada, Faculty of Dentistry, Colegio Máximo de Cartuja s/n, 18071, Granada, Spain,
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Toledano M, Osorio R, Pérez-Álvarez MC, Osorio E, Lynch CD, Toledano-Osorio M. A zinc-doped endodontic cement facilitates functional mineralization and stress dissipation at the dentin surface. Med Oral Patol Oral Cir Bucal 2018; 23:e646-e655. [PMID: 30341273 PMCID: PMC6260998 DOI: 10.4317/medoral.22751] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2018] [Accepted: 09/07/2018] [Indexed: 12/17/2022] Open
Abstract
BACKGROUND The purpose of this study was to evaluate nanohardness and viscoelastic behavior of dentin surfaces treated with two canal sealer cements for dentin remineralization. MATERIAL AND METHODS Dentin surfaces were subjected to: i) 37% phosphoric acid (PA) or ii) 0.5 M ethylenediaminetetraacetic acid (EDTA) conditioning prior to the application of two experimental hydroxyapatite-based cements, containing sodium hydroxide (calcypatite) or zinc oxide (oxipatite), respectively. Samples were stored in simulated body fluid during 24 h or 21 d. The intertubular and peritubular dentin were evaluated using a nanoindenter to assess nanohardness (Hi). The load/displacement responses were used for the nano-dynamic mechanical analysis to estimate complex modulus (E*) and tan delta (δ). The modulus mapping was obtained by imposing a quasistatic force setpoint to which a sinusoidal force was superimposed. AFM imaging and FESEM analysis were performed. RESULTS After 21 d of storage, dentin surfaces treated with EDTA+calcypatite, PA+calcypatite and EDTA+oxipatite showed viscoelastic discrepancies between peritubular and intertubular dentin, meaning a risk for cracking and breakdown of the surface. At both 24 h and 21 d, tan δ values at intertubular dentin treated with the four treatments performed similar. At 21 d time point, intertubular dentin treated with PA+oxipatite achieved the highest complex modulus and nanohardness, i.e., highest resistance to deformation and functional mineralization, among groups. CONCLUSIONS Intertubular and peritubular dentin treated with PA+oxipatite showed similar values of tan δ after 21 d of storage. This produced a favorable dissipation of energy with minimal energy concentration, preserving the structural integrity at the dentin surface.
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Affiliation(s)
- M Toledano
- University of Granada, Faculty of Dentistry, Dental Materials Section, Colegio Máximo de Cartuja s/n, 18071 - Granada - Spain,
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Sánchez JG, Balderrama VS, Garduño SI, Osorio E, Viterisi A, Estrada M, Ferré-Borrull J, Pallarès J, Marsal LF. Impact of inkjet printed ZnO electron transport layer on the characteristics of polymer solar cells. RSC Adv 2018; 8:13094-13102. [PMID: 35542512 PMCID: PMC9079671 DOI: 10.1039/c8ra01481g] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2018] [Accepted: 03/28/2018] [Indexed: 11/21/2022] Open
Abstract
In this paper, we demonstrate that zinc oxide (ZnO) layers deposited by inkjet printing (IJP) can be successfully applied to the low-temperature fabrication of efficient inverted polymer solar cells (i-PSCs). The effects of ZnO layers deposited by IJP as electron transport layer (ETL) on the performance of i-PSCs based on PTB7-Th:PC70BM active layers are investigated. The morphology of the ZnO-IJP layers was analysed by AFM, and compared to that of ZnO layers deposited by different techniques. The study shows that the morphology of the ZnO underlayer has a dramatic effect on the band structure and non-geminate recombination kinetics of the active layer deposited on top of it. Charge carrier and transient photovoltage measurements show that non-geminate recombination is governed by deep trap states in devices made from ZnO-IJP while trapping is less significant for other types of ZnO. The power conversion efficiency of the devices made from ZnO-IJP is mostly limited by their slightly lower JSC, resulting from non-optimum photon conversion efficiency in the visible part of the solar spectrum. Despite these minor limitations their J–V characteristics compare very favourably with that of devices made from ZnO layer deposited using different techniques. In this paper, we demonstrate that zinc oxide (ZnO) layers deposited by inkjet printing (IJP) can be successfully applied to the low-temperature fabrication of efficient inverted polymer solar cells (i-PSCs).![]()
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Affiliation(s)
- José G. Sánchez
- Departament d'Enginyeria Electrònica Elèctrica i Automàtica
- Universitat Rovira i Virgili. Av. Països Catalans 26
- 43007 Tarragona
- Spain
| | - Víctor S. Balderrama
- Cátedra-CONACYT
- Center for Engineering and Industrial Development (CIDESI)
- Micro-Electro-Mechanical Systems Department (MEMS)
- 76125 Santiago de Querétaro
- México
| | - Salvador I. Garduño
- Cátedra-CONACYT
- Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional (CINVESTAV-I.P.N)
- 07360 Ciudad de México
- México
| | - Edith Osorio
- Cátedra-CONACYT
- Universidad de Quintana Roo
- División de Ciencia e Ingeniería
- Chetumal
- México
| | - Aurelien Viterisi
- Departament d'Enginyeria Electrònica Elèctrica i Automàtica
- Universitat Rovira i Virgili. Av. Països Catalans 26
- 43007 Tarragona
- Spain
| | - Magali Estrada
- Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional (CINVESTAV-I.P.N)
- 07360 Ciudad de México
- México
| | - Josep Ferré-Borrull
- Departament d'Enginyeria Electrònica Elèctrica i Automàtica
- Universitat Rovira i Virgili. Av. Països Catalans 26
- 43007 Tarragona
- Spain
| | - Josep Pallarès
- Departament d'Enginyeria Electrònica Elèctrica i Automàtica
- Universitat Rovira i Virgili. Av. Països Catalans 26
- 43007 Tarragona
- Spain
| | - Lluis F. Marsal
- Departament d'Enginyeria Electrònica Elèctrica i Automàtica
- Universitat Rovira i Virgili. Av. Països Catalans 26
- 43007 Tarragona
- Spain
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Cortes N, Osorio Edison H, Alzate F, Cardona-Gomez Gloria P, Osorio E. Protective effect against oxidative neuron cell injury of Amaryllidaceae alkaloids. Am J Transl Res 2017. [DOI: 10.1055/s-0037-1608387] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- N Cortes
- Grupo de Investigación en Sustancias Bioactivas, Facultad de Química Farmacéutica, Universidad de Antioquia UdeA, Calle 70 No. 52 – 21, Medellin, Colombia
| | - H Osorio Edison
- Departamento de Ciencias Básicas. Universidad Católica Luis Amigó, SISCO. Transversal 51A No. 67B-90, Medellin, Colombia
| | - F Alzate
- Grupo de Estudios Botánicos, Facultad de Ciencias Exactas y Naturales, Universidad de Antioquia UdeA, Calle 70 No. 52 – 21, Medellin, Colombia
| | - P Cardona-Gomez Gloria
- Cellular and Molecular Neurobiology Area, Group of Neuroscience of Antioquia, Faculty of Medicine, University of Antioquia, Calle 70 No. 52 – 21, Medellin, Colombia
| | - E Osorio
- Grupo de Investigación en Sustancias Bioactivas, Facultad de Química Farmacéutica, Universidad de Antioquia UdeA, Calle 70 No. 52 – 21, Medellin, Colombia
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Toledano M, Pérez-Álvarez MC, Aguilera FS, Osorio E, Cabello I, Toledano-Osorio M, Osorio R. A zinc oxide-modified hydroxyapatite-based cement facilitated new crystalline-stoichiometric and amorphous apatite precipitation on dentine. Int Endod J 2017; 50 Suppl 2:e109-e119. [DOI: 10.1111/iej.12807] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2017] [Accepted: 06/23/2017] [Indexed: 11/26/2022]
Affiliation(s)
- M. Toledano
- Department of Stomatology; Dental Materials Section; Faculty of Dentistry; University of Granada; Granada Spain
| | | | - F. S. Aguilera
- Department of Stomatology; Dental Materials Section; Faculty of Dentistry; University of Granada; Granada Spain
| | - E. Osorio
- Department of Stomatology; Dental Materials Section; Faculty of Dentistry; University of Granada; Granada Spain
| | - I. Cabello
- Department of Stomatology; Dental Materials Section; Faculty of Dentistry; University of Granada; Granada Spain
| | - M. Toledano-Osorio
- Department of Stomatology; Dental Materials Section; Faculty of Dentistry; University of Granada; Granada Spain
| | - R. Osorio
- Department of Stomatology; Dental Materials Section; Faculty of Dentistry; University of Granada; Granada Spain
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Osorio E, Sánchez JG, Acquaroli LN, Pacio M, Ferré-Borrull J, Pallarès J, Marsal LF. Degradation Analysis of Encapsulated and Nonencapsulated TiO 2/PTB7:PC 70BM/V 2O 5 Solar Cells under Ambient Conditions via Impedance Spectroscopy. ACS Omega 2017; 2:3091-3097. [PMID: 31457641 PMCID: PMC6641627 DOI: 10.1021/acsomega.7b00534] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/29/2017] [Accepted: 06/19/2017] [Indexed: 06/10/2023]
Abstract
Inverted organic cells are promising devices for sustainable and low-cost future electric generation. In this work, we present the degradation mechanisms studied in ITO/TiO2/PTB7:PC70BM/V2O5/Ag inverted organic solar cells (iOSCs) by impedance spectroscopy (IS). Measurements were performed on encapsulated (controlled environment) and nonencapsulated (ambient condition) cells following their temporal evolution under AM1.5 illumination for several voltage biases. From the impedance spectra, analyzed in terms of resistive/capacitive equivalent circuits, we were able to identify that the most sensitive layers inside of the device are contact layers. According with presented, IS technique is useful for determining the materials that have more influence on the degradation of organic solar cells. We demonstrate that IS is a powerful technique to identify the limiting mechanisms and to establish the limiting materials inside of the iOSCs.
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Affiliation(s)
- Edith Osorio
- Departament
d’Enginyeria Electrònica, Elèctrica i Automàtica, Universitat Rovira i Virgili, Avda. Paisos Catalans 26, 43007 Tarragona, Spain
| | - José G. Sánchez
- Departament
d’Enginyeria Electrònica, Elèctrica i Automàtica, Universitat Rovira i Virgili, Avda. Paisos Catalans 26, 43007 Tarragona, Spain
| | - Leandro N. Acquaroli
- Department
of Engineering Physics, Polytechnique Montreal, P.O. Box 6079, Station Centre-Ville, Montreal, Québec H3C 3A7, Canada
| | - Mauricio Pacio
- Centro
de Investigación en Dispositivos Semiconductores, Universidad Autónoma de Puebla CIDS-ICUAP, 14 sur and Av. San Claudio, San Manuel, 72570 Puebla, Mexico
| | - Josep Ferré-Borrull
- Departament
d’Enginyeria Electrònica, Elèctrica i Automàtica, Universitat Rovira i Virgili, Avda. Paisos Catalans 26, 43007 Tarragona, Spain
| | - Josep Pallarès
- Departament
d’Enginyeria Electrònica, Elèctrica i Automàtica, Universitat Rovira i Virgili, Avda. Paisos Catalans 26, 43007 Tarragona, Spain
| | - Lluis F. Marsal
- Departament
d’Enginyeria Electrònica, Elèctrica i Automàtica, Universitat Rovira i Virgili, Avda. Paisos Catalans 26, 43007 Tarragona, Spain
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Aliabadi-Zuckermann A, Goekler J, Kaider A, Uyanik-Uenal K, Riebandt J, Moayedifar R, Osorio E, Haberl T, Laufer G, Smits J, Zuckermann A. To Accept or Not Accept, That Is the Question: Donor Heart Selection Process and Outcome of Discarded Organs Transplanted in Another Center. J Heart Lung Transplant 2017. [DOI: 10.1016/j.healun.2017.01.1107] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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Freystaetter K, Bohmig G, Aliabadi-Zuckermann A, Moayedifar R, Osorio E, Uyanik-Uenal K, Laufer G, Zuckermann A. Incidence of Chronic Renal Dysfunction Prior to Cardiac Transplantation: A Retrospective Single Center Analysis. J Heart Lung Transplant 2017. [DOI: 10.1016/j.healun.2017.01.614] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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Haberl T, Riebandt J, Aliabadi-Zuckermann A, Wiedemann D, Moayedifar R, Osorio E, Hutschala D, Laufer G, Zuckermann A. Ischemia Time and the Eurotransplant Heart Donor Score as Predictors for Primary Graft Dysfunction. J Heart Lung Transplant 2017. [DOI: 10.1016/j.healun.2017.01.103] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
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Goekler J, Zuckermann A, Osorio E, Uyanik-Uenal K, Laufer G, Aliabadi-Zuckermann A. Acute Cellular Rejection (ACR) ± Antibody Mediated Rejection (AMR) - Double Trouble or Overrated? J Heart Lung Transplant 2017. [DOI: 10.1016/j.healun.2017.01.586] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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Yañez O, Vásquez-Espinal A, Pino-Rios R, Ferraro F, Pan S, Osorio E, Merino G, Tiznado W. Exploiting electronic strategies to stabilize a planar tetracoordinate carbon in cyclic aromatic hydrocarbons. Chem Commun (Camb) 2017; 53:12112-12115. [DOI: 10.1039/c7cc06248f] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new approach to stabilize compounds containing a planar tetracoordinate carbon (ptC), embedded in aromatic hydrocarbons, is presented herein.
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Affiliation(s)
- O. Yañez
- Doctorado en Fisicoquímica Molecular
- Facultad de Ciencias Exactas
- Universidad Andres Bello
- República 275
- Santiago
| | - A. Vásquez-Espinal
- Departamento de Física Aplicada
- Centro de Investigación y de Estudios Avanzados Unidad Mérida
- Km. 6 Antigua carretera a Progreso
- Apdo. Postal 73
- Mérida
| | - R. Pino-Rios
- Departamento de Ciencias Químicas
- Facultad de Ciencias Exactas Universidad Andres Bello
- República 275
- Santiago
- Chile
| | - F. Ferraro
- Departamento de Ciencias Básicas
- Universidad Católica Luis Amigó, SISCO
- Transversal 51A # 67B 90
- Medellín
- Colombia
| | - S. Pan
- Departamento de Física Aplicada
- Centro de Investigación y de Estudios Avanzados Unidad Mérida
- Km. 6 Antigua carretera a Progreso
- Apdo. Postal 73
- Mérida
| | - E. Osorio
- Departamento de Ciencias Básicas
- Universidad Católica Luis Amigó, SISCO
- Transversal 51A # 67B 90
- Medellín
- Colombia
| | - G. Merino
- Departamento de Física Aplicada
- Centro de Investigación y de Estudios Avanzados Unidad Mérida
- Km. 6 Antigua carretera a Progreso
- Apdo. Postal 73
- Mérida
| | - W. Tiznado
- Departamento de Ciencias Químicas
- Facultad de Ciencias Exactas Universidad Andres Bello
- República 275
- Santiago
- Chile
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Tapia J, Oyarce H, Raineri I, Regonesi I, Urquidi C, Donoso M, Osorio E. A Comparison Between Barbed Suture and Synthetic Multifilament Suture for the Vaginal Cuff Closure in Total Laparoscopic Hysterectomy: A 4-Year Experience in a Community Hospital and a Private Clinic. J Minim Invasive Gynecol 2016. [DOI: 10.1016/j.jmig.2016.08.692] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Otero Gonzalez A, Prol MPB, Caride MJC, Nores JS, Novoa E, Melon CP, Macia P, Alves MT, Cid M, Osorio E, Coto E, Macias Nuñez JF. Estimated glomerular filtration rate (eGFR), 25(OH) D3, chronic kidney disease (CKD), the MYH9 (myosin heavy chain 9) gene in old and very elderly people. Int Urol Nephrol 2015; 47:1403-8. [PMID: 26152646 DOI: 10.1007/s11255-015-1041-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2014] [Accepted: 06/19/2015] [Indexed: 01/30/2023]
Abstract
It is known that the common physiological denominator of the ageing process is an attenuation of functional performance with respect to the situation of young people and adults. However, since the first cohort-based longitudinal studies, it has not been possible to establish a "linear" relationship between age and glomerular filtration in all cases. This does not mean that there is no physiological ageing process at all; in addition to those already elucidated, its mechanisms include cell senescence, podocyte dysfunction, a vitamin D deficiency, and homozygotic forms of the MYH9 gene. The aim of the present work was to analyse the prevalence of chronic kidney disease (CKD) and, where possible, the correlation between CKD, defined by an eGFR < 60 ml/min/1.73 m(2), plasma 25(OH)D3 levels and the MYH9 gene in a population of elderly and very elderly persons. These parameters have not been evaluated previously in populations of elderly and very elderly patients. It is concluded that a moderate decrease in the eGFR occurs with age. This does not imply the presence of CKD in elderly people, since in most individuals the reduced eGFR is not accompanied by anaemia, and no individuals show hypocalcaemia, hyperphosphataemia or a high Alb/Cr ratio. Here we observed a lower Hb level and an elevated Alb/Cr ratio in subjects heterozygotic for the MYH9 gene. This could be interpreted in the sense that the gene could exert some protective effect on renal function, whereas the heterozygotic form (allele A) of the MYH9 gene could be considered a very early marker, a new risk factor for the appearance of CKD, or a sign of renal frailty in elderly people.
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Affiliation(s)
- A Otero Gonzalez
- Servicio de Nefrología-Unidad Investigación, C.H Universitario de Ourense, Ourense, Spain
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Osorio R, Osorio E, Medina-Castillo AL, Toledano M. Polymer nanocarriers for dentin adhesion. J Dent Res 2014; 93:1258-63. [PMID: 25227634 PMCID: PMC4462807 DOI: 10.1177/0022034514551608] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2014] [Revised: 07/23/2014] [Accepted: 08/22/2014] [Indexed: 01/07/2023] Open
Abstract
To obtain more durable adhesion to dentin, and to protect collagen fibrils of the dentin matrix from degradation, calcium- and phosphate-releasing particles have been incorporated into the dental adhesive procedure. The aim of the present study was to incorporate zinc-loaded polymeric nanocarriers into a dental adhesive system to facilitate inhibition of matrix metalloproteinases (MMPs)-mediated collagen degradation and to provide calcium ions for mineral deposition within the resin-dentin bonded interface. PolymP- N : Active nanoparticles (nanoMyP) were zinc-loaded through 30-minute ZnCl2 immersion and tested for bioactivity by means of 7 days' immersion in simulated body fluid solution (the Kokubo test). Zinc-loading and calcium phosphate depositions were examined by scanning and transmission electron microscopy, elemental analysis, and x-ray diffraction. Nanoparticles in ethanol solution infiltrated into phosphoric-acid-etched human dentin and Single Bond (3M/ESPE) were applied to determine whether the nanoparticles interfered with bonding. Debonded sticks were analyzed by scanning electron microscopy. A metalloproteinase collagen degradation assay was also performed in resin-infiltrated dentin with and without nanoparticles, measuring C-terminal telopeptide of type I collagen (ICTP) concentration in supernatants, after 4 wk of immersion in artificial saliva. Numerical data were analyzed by analysis of variance (ANOVA) and Student-Newman-Keuls multiple comparisons tests (p < .05). Nanoparticles were effectively zinc-loaded and were shown to have a chelating effect, retaining calcium regardless of zinc incorporation. Nanoparticles failed to infiltrate demineralized intertubular dentin and remained on top of the hybrid layer, without altering bond strength. Calcium and phosphorus were found covering nanoparticles at the hybrid layer, after 24 h. Nanoparticle application in etched dentin also reduced MMP-mediated collagen degradation. Tested nanoparticles may be incorporated into dental adhesive systems to provide the appropriate environment in which dentin MMP collagen degradation is inhibited and mineral growth can occur.
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Affiliation(s)
- R Osorio
- Dental School, University of Granada, Colegio Maximo, Campus de Cartuja s/n, 18017 Granada, Spain
| | - E Osorio
- Dental School, University of Granada, Colegio Maximo, Campus de Cartuja s/n, 18017 Granada, Spain
| | - A L Medina-Castillo
- NanoMyP, Spin-Off Enterprise from University of Granada, Edificio BIC-Granada, Av. Innovación 1, 18016 Armilla, Granada, Spain
| | - M Toledano
- Dental School, University of Granada, Colegio Maximo, Campus de Cartuja s/n, 18017 Granada, Spain
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Osorio R, Osorio E, Cabello I, Toledano M. Zinc Induces Apatite and Scholzite Formation during Dentin Remineralization. Caries Res 2014; 48:276-90. [DOI: 10.1159/000356873] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2013] [Accepted: 10/28/2013] [Indexed: 01/01/2023] Open
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Osorio R, Osorio E, Medina-Castillo A, Toledano M. Polymer nanocarriers as new fillers for dental adhesives. Dent Mater 2014. [DOI: 10.1016/j.dental.2014.08.101] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Tapia J, San Martin R, Lagos I, Donoso M, Osorio E. Use of Palmer's Point in Laparoscopic Hysterectomy Surgery: Experience in Thirty-Seven Cases. J Minim Invasive Gynecol 2013. [DOI: 10.1016/j.jmig.2013.08.394] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Muller EA, Rodriguez A, Nuñez-Forero L, Moyano L, González P, Osorio E, Diaz L, Rodriguez N, Parra AR, Duarte HG. P3.080 Prevalence of C. Trachomatis, N. Gonorrheae, T. Vaginalis, C. Albicans, Syphilis, Bacterial Vaginosis & HIV in a Population of Women with Symptoms of Lower Genital Infections in Bogotá, Colombia 2010. Br J Vener Dis 2013. [DOI: 10.1136/sextrans-2013-051184.0540] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Toledano M, Yamauti M, Osorio E, Osorio R. Zinc-Inhibited MMP-Mediated Collagen Degradation after Different Dentine Demineralization Procedures. Caries Res 2012; 46:201-7. [DOI: 10.1159/000337315] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2011] [Accepted: 02/01/2012] [Indexed: 12/25/2022] Open
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Toledano M, Mazzoni A, Monticelli F, Breschi L, Osorio E, Osorio R. ElectroBond application may improve wetting characteristics of etched dentine. J Dent 2011; 39:180-6. [DOI: 10.1016/j.jdent.2010.11.009] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2010] [Revised: 11/22/2010] [Accepted: 11/23/2010] [Indexed: 11/25/2022] Open
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Toledano M, Yamauti M, Osorio E, Quintana M, Osorio R. Bleaching agents increase metalloproteinases mediated collagen degradation in dentin. Dent Mater 2011. [DOI: 10.1016/j.dental.2011.08.458] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Aguilera FS, Osorio E, Toledano M, Osorio R. Ultra-structure characterization of self-etching treated cementum surfaces. Med Oral Patol Oral Cir Bucal 2011; 16:e265-70. [DOI: 10.4317/medoral.16.e265] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2010] [Accepted: 06/25/2010] [Indexed: 11/05/2022] Open
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Osorio R, Yamauti M, San Roman J, Osorio E, Toledano M. Zinc-doped dentin adhesives for collagen protection at the hybrid layer. Dent Mater 2011. [DOI: 10.1016/j.dental.2011.08.434] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Osorio R, Yamauti M, Osorio E, Ruiz-Requena ME, Pashley DH, Tay FR, Toledano M. Zinc reduces collagen degradation in demineralized human dentin explants. J Dent 2010; 39:148-53. [PMID: 21108986 DOI: 10.1016/j.jdent.2010.11.005] [Citation(s) in RCA: 107] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2010] [Revised: 10/22/2010] [Accepted: 11/16/2010] [Indexed: 01/10/2023] Open
Abstract
OBJECTIVES Dentin matrix metalloproteinases are implicated in the pathogenesis of caries and contribute to collagen degradation in resin-dentin interfaces. The objective was to determine if collagen degradation may be modulated by an excess of zinc or zinc chelators. METHODS Mineralized and phosphoric acid demineralized human dentin specimens were tested. Chlorhexidine digluconate, doxycycline or ZnCl₂ were added to the media. In half of the groups, active exogenous metalloproteinase-2 was incorporated into the solution. C-terminal telopeptide determinations (radioimmunoassay) were performed after 24 h, 1 and 3 weeks. RESULTS Collagen degradation was prominent in demineralized dentin. Doxycycline fully blocked dentin proteolysis. Chlorhexidine digluconate reduced the degradation at the 24-h period. Zinc in excess strongly inhibits hydrolysis of collagen and its effect was maintained for 3 weeks. CONCLUSIONS Zinc in excess reduces MMP-mediated collagen degradation. The hypothesis that binding of zinc to collagen results in protection of sensitive cleavage sites of metalloproteinases requires further validation.
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Affiliation(s)
- R Osorio
- Department of Dental Materials, School of Dentistry, Campus de Cartuja s/n, University of Granada, E-18071 Granada, Spain.
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Abstract
In ethanol wet bonding, water is replaced by ethanol to maintain dehydrated collagen matrices in an extended state to facilitate resin infiltration. Since short ethanol dehydration protocols may be ineffective, this study tested the null hypothesis that there are no differences in ethanol dehydration protocols for maintaining the surface roughness, fibril diameter, and interfibrillar spaces of acid-etched dentin. Polished human dentin surfaces were etched with phosphoric acid and water-rinsed. Tested protocols were: (1) water-rinse (control); (2) 100% ethanol-rinse (1-min); (3) 100% ethanol-rinse (5-min); and (4) progressive ethanol replacement (50-100%). Surface roughness, fibril diameter, and interfibrillar spaces were determined with atomic force microscopy and analyzed by one-way analysis of variance and the Student-Newman-Keuls test (α = 0.05). Dentin roughness and fibril diameter significantly decreased when 100% ethanol (1-5 min) was used for rinsing (p < 0.001). Absolute ethanol produced collapse and shrinkage of collagen fibrils. Ascending ethanol concentrations did not collapse the matrix and shrank the fibrils less than absolute ethanol-rinses.
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Affiliation(s)
- E Osorio
- Department of Dental Materials, School of Dentistry, University of Granada, Spain.
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Toledano M, Osorio E, Aguilera FS, Gomes G, Perdigão J, Osorio R. Bond strength and nanoroughness assessment on human pretreated cementum surfaces. J Dent 2010; 38:678-85. [PMID: 20546826 DOI: 10.1016/j.jdent.2010.05.011] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2010] [Revised: 05/13/2010] [Accepted: 05/13/2010] [Indexed: 11/28/2022] Open
Abstract
OBJECTIVES To determine the bond strength of seven adhesive systems to human cementum, and to assess the promoted surface roughness. METHODS Extracted human canines were used for the present study. The mesial surface from the cervical third of the roots were ground flat with wet 600-grit silicon carbide paper and bonded. Seven adhesive systems were employed: an etch-and-rinse adhesive (Single Bond), two two-step self-etching (Clearfil SE Bond and Resulcin Aquaprime) and four one-step self-etching (One-up Bond F, Prompt-L-Pop, Etch and Prime 3.0 and NRC+Prime&Bond NT). Composite build-ups were constructed and stored in a humid environment for 24h at 37 degrees C. Specimens were sectioned into 1mm(2) beams and tested for microtensile bond strength (MTBS). Additional surfaces were conditioned for atomic force microscopy (AFM) analysis. Results were analyzed with ANOVA and Student-Newman-Keuls tests (P<0.05). RESULTS Single Bond showed the highest MTBS values. No differences were found between Resulcin Aquaprime, One-up Bond and Prompt-L-Pop. Clearfil SE Bond, Etch and Prime and NRC+Prime&Bond NT obtained the lowest bond strength values. H(3)PO(4) acid treatment of cementum and Resulcin Aquaprime showed the highest nanoroughness parameters and One-up Bond the lowest. CONCLUSION The etch-and-rinse adhesive and the two-step self-etching adhesive with the lowest pH value promoted the highest bond strength to human cementum surfaces.
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Affiliation(s)
- M Toledano
- Department of Dental Materials, School of Dentistry, University of Granada, Avda Fuerzas Armadas 1, 1B, 18014 Granada, Spain.
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Erhardt MC, Osorio R, Pisani-Proenca J, Aguilera FS, Osorio E, Breschi L, Toledano M. Effect of Double Layering and Prolonged Application Time on MTBS of Water/Ethanol-based Self-etch Adhesives to Dentin. Oper Dent 2009; 34:571-7. [DOI: 10.2341/08-060-l] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Clinical Relevance
Problems related to the chemical formulation and/or chemical dispersion of hydrophilic/hydrophobic components in one-step self-etch adhesives limit their efficacy and are not easily solved by changing the different bonding application parameters.
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Oueslati I, Manai H, Haddada F, Daoud D, Sánchez J, Osorio E, Zarrouk M. Sterol, Triterpenic Dialcohol, and Triacylglycerol Compounds of Extra Virgin Olive Oils from Some Tunisian Varieties Grown in the Region of Tataouine. FOOD SCI TECHNOL INT 2009. [DOI: 10.1177/1082013208101024] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The aim of this work was to study some of the chemical characteristics of virgin olive oils produced by three varieties grown in Tataouine (south of Tunisia). The oil samples studied were characterized by high levels of oleic acid (470%) and relatively low percentages of linoleic and palmitic acids (≤13% and ≤10%, respectively). They were also characterized by three primary triacylglycerols: OOO, POO, and OOL, and three secondary triacylglycerols POL + SLL, SOO, and PPO. The sterol and triterpenic dialcohol compositions of all the samples lay within the established regulatory limits. The main sterols found were b-sitosterol, Δ5-avenasterol, and campesterol. The amount of minor sterols present (24-methylenecholesterol, cholesterol, Δ7-avenasterol, and Δ7-stigmastenol) varied widely according to the varieties. The levels of erythrodiol + uvaol were below the upper legal limit of 4.5% in all analyzed samples. The results obtained showed that the great variability in oil composition among the varieties studied are influenced exclusively by the genetic factor.
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Affiliation(s)
- I. Oueslati
- Laboratoire Caractérisation et Qualité dé l'Huile d'Olive, Centre de Biotechnologie, Technopole de Borj-Cédria B.P. 901, Hammam-Lif 2050, Tunisia
| | - H. Manai
- Laboratoire Caractérisation et Qualité dé l'Huile d'Olive, Centre de Biotechnologie, Technopole de Borj-Cédria B.P. 901, Hammam-Lif 2050, Tunisia
| | - F.M. Haddada
- Laboratoire Caractérisation et Qualité dé l'Huile d'Olive, Centre de Biotechnologie, Technopole de Borj-Cédria B.P. 901, Hammam-Lif 2050, Tunisia
| | - D. Daoud
- Laboratoire Caractérisation et Qualité dé l'Huile d'Olive, Centre de Biotechnologie, Technopole de Borj-Cédria B.P. 901, Hammam-Lif 2050, Tunisia
| | - J. Sánchez
- Instituto Técnológico Agroaliméntario. Dirécción Général dé Infraestructuras y Desarrollo Tecnológico Junta dé Extremadura. Carretera dé Caceres s/n. Badajoz 06071, Spain
| | - E. Osorio
- Instituto Técnológico Agroaliméntario. Dirécción Général dé Infraestructuras y Desarrollo Tecnológico Junta dé Extremadura. Carretera dé Caceres s/n. Badajoz 06071, Spain
| | - M. Zarrouk
- Laboratoire Caractérisation et Qualité dé l'Huile d'Olive, Centre de Biotechnologie, Technopole de Borj-Cédria B.P. 901, Hammam-Lif 2050, Tunisia,
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Abstract
The chemo-mechanical surface treatment of fiber posts increases their bonding properties. The combined use of atomic force and confocal microscopy allows for the assessment and quantification of the changes on surface roughness that justify this behavior. Quartz fiber posts were conditioned with different chemicals, as well as by sandblasting, and by an industrial silicate/silane coating. We analyzed post surfaces by atomic force microscopy, recording average roughness (Ra) measurements of fibers and resin matrix. A confocal image profiler allowed for the quantitative assessment of the average superficial roughness (Ra). Hydrofluoric acid, potassium permanganate, sodium ethoxide, and sandblasting increased post surface roughness. Modifications of the epoxy resin matrix occurred after the surface pre-treatments. Hydrofluoric acid affected the superficial texture of quartz fibers. Surface-conditioning procedures that selectively react with the epoxy-resin matrix of the fiber post enhance roughness and improve the surface area available for adhesion by creating micro-retentive spaces without affecting the post’s inner structure.
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Affiliation(s)
- C. Mazzitelli
- Department of Dental Materials and Restorative Dentistry, Policlinico "Le Scotte", University of Siena, Italy; and
- Department of Dental Materials, School of Dentistry, University of Granada, Colegio Maximo, Campus de Cartuja s/n 18071, Granada, Spain
| | - M. Ferrari
- Department of Dental Materials and Restorative Dentistry, Policlinico "Le Scotte", University of Siena, Italy; and
- Department of Dental Materials, School of Dentistry, University of Granada, Colegio Maximo, Campus de Cartuja s/n 18071, Granada, Spain
| | - M. Toledano
- Department of Dental Materials and Restorative Dentistry, Policlinico "Le Scotte", University of Siena, Italy; and
- Department of Dental Materials, School of Dentistry, University of Granada, Colegio Maximo, Campus de Cartuja s/n 18071, Granada, Spain
| | - E. Osorio
- Department of Dental Materials and Restorative Dentistry, Policlinico "Le Scotte", University of Siena, Italy; and
- Department of Dental Materials, School of Dentistry, University of Granada, Colegio Maximo, Campus de Cartuja s/n 18071, Granada, Spain
| | - F. Monticelli
- Department of Dental Materials and Restorative Dentistry, Policlinico "Le Scotte", University of Siena, Italy; and
- Department of Dental Materials, School of Dentistry, University of Granada, Colegio Maximo, Campus de Cartuja s/n 18071, Granada, Spain
| | - R. Osorio
- Department of Dental Materials and Restorative Dentistry, Policlinico "Le Scotte", University of Siena, Italy; and
- Department of Dental Materials, School of Dentistry, University of Granada, Colegio Maximo, Campus de Cartuja s/n 18071, Granada, Spain
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Toledano M, Proença JP, Erhardt MCG, Osorio E, Aguilera FS, Osorio R, Tay FR. Increases in Dentin-bond Strength If Doubling Application Time of an Acetone-containing One-step Adhesive. Oper Dent 2007; 32:133-7. [PMID: 17427821 DOI: 10.2341/06-32] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Clinical Relevance
When treating dentin surfaces with Futurabond one-step self-etch bonding agent, in order to obtain higher microtensile bond strength, doubling the application time of the adhesive should be considered.
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Affiliation(s)
- M Toledano
- Department of Dental Materials, School of Dentistry, University of Granada, Spain.
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Abstract
The existence of unprotected collagen fibrils within the hybrid layer compromises the longevity of restorations. This phenomenon may be avoided if solutions other than strong acids are used for dentin demineralization. The hypothesis to be tested is that bond durability may be improved by EDTA demineralization. Dentin surfaces (human and bovine) were bonded: (1) after phosphoric-acid-etching, and after EDTA demineralization with (2) a total-etch adhesive and (3) a self-etching adhesive. After the teeth were sectioned into beams, half of the specimens were immersed in NaOCl, while the other half was immersed in water. Beams were tested to failure in tension. ANOVA and multiple-comparisons tests were used (P < 0.05). No differences in bond strength were found among the 3 bonding procedures, although bonds made to human molars were 43-61% higher than those to bovine incisors. After NaOCl immersion, only specimens subjected to EDTA demineralization maintained the initial bond strength. We conclude that the collagen network is better-preserved after EDTA demineralization.
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Affiliation(s)
- R Osorio
- Department of Dental Materials, School of Dentistry, University of Granada, 18014 Granada, Spain
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del Río C, Torres L, Chen J, López L, Schnaas M, Hernández M, Osorio E, Cebrián M, Galván M. Prenatal Dietary Deficiency of Vitamin B12 and Neurodevelopment During the First Year of Life. Am J Epidemiol 2006. [DOI: 10.1093/aje/163.suppl_11.s252-b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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del Rio Garcia C, Sanchez TL, Chen J, Carrillo LL, Schnaas M, Hernandez M, Osorio E, Garcia CM, Portillo GM. Prenatal Dietary Deficiency of Vitamin B12 and Neurodevelopment During the First Year of Life. Am J Epidemiol 2006. [DOI: 10.1093/aje/163.suppl_11.s19-d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Osorio R, Toledano M, Osorio E, Aguilera FS, Tay FR. Effect of load cycling andin vitro degradation on resin-dentin bonds using a self-etching primer. J Biomed Mater Res A 2005; 72:399-408. [PMID: 15678486 DOI: 10.1002/jbm.a.30274] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
The objective of this study was to evaluate the effect of in vitro degradation and mechanical loading on microtensile bond strength (MTBS) and microleakage (ML) of a resin composite to dentin using a self-etching primer adhesive [Clearfil SE Bond (SEB)] under two hydration statuses. Twenty-four flat dentin surfaces were divided in groups: 1) blot-dried, 2) air-dried. SEB was applied and resin buildups were performed with Tetric Ceram. Specimens were divided in four subgroups: a) sectioned into beams, b) load cycled, c) beams were immersed in NaOCl for 5 h, d) load cycled and immersed in NaOCl. Beams were tested in tension. For ML testing, 80 Class V cavities were prepared and molars divided in subgroups as described above (in group c and d, specimens were kept in distilled water for 1 year, instead of the 5-h NaOCl immersion). ML was assessed by dye penetration. Analysis of variance and multiple comparisons tests were used for MTBS. For ML, Mann-Whitney U and Wilcoxon matched pairs signed ranked were used (p<0.05). SEB applied to completely dehydrated dentin produced the highest MTBS, at 24-h evaluation. In vitro degradation always decreased MTBS, and fatigue loading only diminished MTBS on dehydrated dentin. Load cycling increased dye penetration on dentin margins. Degradation always increased ML in both enamel and dentin margins.
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Affiliation(s)
- R Osorio
- Department of Dental Materials, School of Dentistry, University of Granada, Granada E-18071, Spain
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Nowzari H, Jorgensen MG, Aswad S, Khan N, Osorio E, Safarian A, Shidban H, Munroe S. Human cytomegalovirus-associated periodontitis in renal transplant patients. Transplant Proc 2004; 35:2949-52. [PMID: 14697947 DOI: 10.1016/j.transproceed.2003.10.026] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
BACKGROUND Human cytomegalovirus (HCMV) infection is associated with renal transplant failure. Periodontal pockets may be reservoirs for HCMV replication. OBJECTIVES This study was done to determine active HCMV replication in saliva and gingival crevicular fluid of renal transplant patients affected by periodontitis. METHODS HCMV pp67-mRNA amplification was analyzed in oral fluids of 38 transplant recipients at 6 months' posttransplantation. Patients received antiviral therapy until 3 months' posttransplantation. The HCMV-positive cell line VR-977 was the positive control, and oral fluids from healthy volunteers served as the negative control. Periodontitis was diagnosed by clinical examination. Serum HCMV IgG and IgM were analyzed to differentiate recent and latent infection. RESULTS Prevalence of gingival overgrowth was 68.4%. HCMV gene transcripts were detected in the saliva of 21% and the gingival crevicular fluid of 18% of patients. All patients (100%) with HCMV pp67-mRNA detected in saliva demonstrated clinical manifestations of viral infection, as did 86% of patients with HCMV pp67-mRNA detected in the gingival crevicular fluid. Serum IgM was positive in 7.9% of patients and IgG in 65.8%; however, associations with active mRNA replication were not statistically significant. CONCLUSIONS Renal transplant patients affected by periodontitis are at risk of viral replication within the periodontal tissues despite antiviral therapy. This study suggests that use of HCMV pp67-mRNA detection in saliva and gingival crevicular fluid provides markers of active viral infection, and evidence for a link between HCMV-associated periodontitis and renal transplant complications.
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Affiliation(s)
- H Nowzari
- School of Dentistry, University of Southern California, 925 West 34th Street, Los Angeles, CA 90089-0641, USA
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Domingo C, Arcís RW, Osorio E, Osorio R, Fanovich MA, Rodríguez-Clemente R, Toledano M. Hydrolytic stability of experimental hydroxyapatite-filled dental composite materials. Dent Mater 2003; 19:478-86. [PMID: 12837395 DOI: 10.1016/s0109-5641(02)00093-3] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
OBJECTIVES The purpose of this study was to analyze the behavior in water, related to mechanical properties, of experimental composites for dental restoration. METHODS The studied materials were composed of a visible-light-curing monomer mixture (Bis-GMA and TEGDMA or HEMA) and micrometric, nanometric or a mixture of both sizes hydroxyapatite particles as a reinforcing filler. Filler particles were modified with a coupling agent (citric, hydrosuccinic, acrylic or methacrylic acid or silane). The hydrolytic stability of the evaluated materials was studied through total elution and water-uptake tests. Percent net-mass variation was daily monitored and analyzed as a function of time. Mechanical performance was examined through flexural properties and Vickers hardness. Morphological surface changes were observed with scanning electron microscopy. ANOVA statistical analysis was performed (P<0.05). RESULTS In general, the use of HEMA instead of TEGDMA did not substantially worsen the composite quality. Dental composites containing only nanometric particles of hydroxyapatite as a filler are unsuitable for clinical performance. Midway-filled composite resins loaded with micro-HAP particles, coated with citric, acrylic or methacrylic acid displayed low percent elution and water-uptake values. Mechanical properties were similar or even superior to those measured for silane treated particles. SIGNIFICANCE More research is needed to further improve the interaction of nano-HAP particles with the polymeric matrix, either as a single filler or, preferentially, mixed with micro-HAP, that will allow to increase the total loading of reinforcing filler and, hence, to improve the mechanical properties.
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Affiliation(s)
- C Domingo
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus de la UAB, 08193 Bellaterra, Spain.
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Toledano M, Perdigão J, Osorio R, Osorio E. Effect of dentin deproteinization on microleakage of Class V composite restorations. Oper Dent 2000; 25:497-504. [PMID: 11203862] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
Abstract
The role of the collagen fibers in dentin adhesion has not clearly been established. Therefore, this laboratory study evaluated the microleakage at resin-dentin and resin-enamel interfaces of Class V composite restorations after etching enamel and dentin with phosphoric acid (H3PO4) or after etching with H3PO4 followed by deproteinization with 5% sodium hypochlorite (NaOCl) to prevent the formation of a hybrid layer. Ten extracted human molars were used to prepare standardized Class V cavities on both buccal and lingual surfaces. The teeth were randomly divided in two groups: 1) Class V cavities that were etched with H3PO4 for 15 seconds; b) Class V cavities that were etched with H3PO4 for 15 seconds followed by collagen removal with 5% NaOCl for two minutes. The cavities were restored using the Prime & Bond 2.1 bonding system and TPH resin composite. The specimens were stored in water for 24 hours at 37 degrees C and thermocycled 500 times between water baths kept at 5 degrees C and 55 degrees C. After thermocycling, specimens were immersed in a 0.5% aqueous solution of basic fuchsin for 24 hours. Three longitudinal sections of each restoration were obtained and examined with a stereomicroscope for qualitative evaluation of microleakage. The data were statistically analyzed by Mann-Whitney U and Wilcoxon matched pairs signed ranked tests. Extra specimens were analyzed with the scanning electron microscope (SEM). Occlusal margins (enamel margins) resulted in statistical lower degree of leakage than gingival margins (dentin/cementum margins) in both treatment groups. For each type of margin, there were no statistically significant differences between the etched and the etched and deproteinized groups. Under the SEM, occlusal surfaces showed no detachment between enamel and dentin, while dentin/cementum resulted in gap formation.
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Affiliation(s)
- M Toledano
- Department of Dental Materials, School of Dentistry, University of Granada, Campus Cartuja s/n, E-18071 Granada-Spain
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Domingo C, Arcis RW, Osorio E, Toledano M, Saurina J. Principal component analysis and cluster analysis for the characterization of dental composites. Analyst 2000; 125:2044-8. [PMID: 11193092 DOI: 10.1039/b004662k] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Various experimental dental materials were characterized using chemometric methods. The main aim of the study was to ascertain which composite materials present the best properties for use in restorative dentistry. Bisphenol-alpha-glycidyl methacrylate-based composites containing hydroxyapatite as a filler and a coupling agent were prepared using a photocuring polymerization procedure. Several chemical and mechanical properties of experimental composites were measured and the corresponding data were further studied using principal component analysis and cluster analysis. Results from the characterization allowed the most appropriate materials to be selected. Various composites presented acceptable general properties suggesting their suitability as substitutes for commercial materials in dentistry.
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Affiliation(s)
- C Domingo
- Instituto de Ciencia de Materiales de Barcelona, CSIC, Campus UAB, 08193 Bellaterra, Spain
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40
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Abstract
OBJECTIVE This study evaluated the microleakage and interfacial micromorphology of Class V cervical amalgam restorations lined with OptiBond, AElitebond, or Panavia 21. METHODS Unlined amalgams served as control. Cavities were treated with each dentin bonding system according to the manufacturers' instructions and restored with Tytin non-gamma 2 spherical amalgam. After one week of storage in tap water at 37 degrees C, the specimens were thermocycled (1000 cycles, 6-60 degrees C, 30s dwell time). Microleakage was assessed by means of basic fuchsin dye penetration and recorded according to an ordinal scale. RESULTS None of the systems tested in this study completely eliminated microleakage. Kruskal-Wallis one-way ANOVA and Mann-Whitney U test found that on the occlusal wall, Panavia 21 and the control group had the least leakage (P<0.05). No statistically significant differences were found at dentin margins (P>0.05). Wilcoxon matched pairs signed rank test found that Panavia 21 and the control group had less leakage at the occlusal than at the dentin margins (P<0.05); when AElitebond and OptiBond groups were evaluated, microleakage at the enamel and at the dentin margins was similar for each group. With the adhesive systems, perhaps the hydrophilic bonding agents incorporated the dye during specimen immersion and/or sectioning. CONCLUSIONS The use of adhesives may not be as worthy as resin cements for sealing and bonding amalgam restorations to enamel and dentin.
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Affiliation(s)
- M Toledano
- Department of Dental Materials, University of Granada, Spain.
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41
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Abstract
STATEMENT OF PROBLEM Resin-modified glass ionomers and polyacid-modified resin composites (compomers) have been introduced to provide esthetic restorations. However, there is concern about the marginal sealing ability of these materials, especially at the dentin (cementum) aspects of restorations. PURPOSE This in vitro study evaluated the microleakage of Class V restorations made with resin-modified glass ionomers or a compomer. MATERIAL AND METHODS Thirty noncarious human molar teeth were used. Standardized kidney-shaped Class V cavity preparations were placed in the buccal and lingual surfaces at the cementoenamel junction. Teeth were randomly assigned to 3 experimental groups of 10 teeth each and restored as follows: group 1, Fuji II LC; group 2, Vitremer; and group 3, Dyract. In all cases, the manufacturers' instructions were strictly followed. All materials were placed in a single increment. Unfinished restorations were immediately coated with the respective manufacturers' sealer or varnish and this was either light cured for 20 seconds or allowed to air-dry. After 24 hours, teeth were finished to contour and to the cavosurface margins, coated with nail varnish except for 1 mm around the restoration margin, thermocycled (1000x, 5-55 degrees C) and placed in a solution of 2% basic fuchsin dye for 24 hours at room temperature. The staining along the tooth restoration interface was recorded. RESULTS Kruskal-Wallis 1-way analysis of variance revealed significant differences among all restorative materials for the overall, occlusal, and gingival scores (P =.03, P =.01, P =.01, respectively). Occlusal and gingival scores for each matched pair of restorative materials using the Wilcoxon test showed statistically significant differences between Fuji II LC glass ionomer cement and Dyract composite, both for the occlusal (P =.005) and gingival (P =.005) margins and also as an overall evaluation (P =.01), with Fuji II LC showing the least dye penetration. Vitremer revealed dye penetration scores not significantly different from Fuji II LC glass ionomer cement or Dyract composite. CONCLUSION Resin-modified glass ionomers showed less or similar microleakage than the polyacid-modified composite resin tested.
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42
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Bravo M, Baca P, Llodra JC, Osorio E. A 24-month study comparing sealant and fluoride varnish in caries reduction on different permanent first molar surfaces. J Public Health Dent 1997; 57:184-6. [PMID: 9383759 DOI: 10.1111/j.1752-7325.1997.tb02972.x] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
OBJECTIVE The aim of this study was to determine the separate effects of dental sealants and fluoride varnish on dental caries in fissured and nonfissured surfaces of permanent first molars. METHODS A clinical trial was conducted with three groups of 6- to 8-year-old schoolchildren: a sealant group (n = 100), in which Delton was applied to first molars; a varnish group (n = 98), in which Duraphat was applied to first molars; and a control group (n = 116), which had no intervention as part of the study. Absolute and percent caries reductions were compared at 24 months. RESULTS Compared to the controls, sealants resulted in a 68 percent and 87 percent reduction on fissured and nonfissured surfaces, respectively. The corresponding figures for varnish were 38 percent and 66 percent. CONCLUSION Sealant and fluoride varnish are effective in preventing caries in both fissured and nonfissured surface.
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Affiliation(s)
- M Bravo
- Departamento de Odontología Preventiva, Facultad de Odontología, Universidad de Granada, Granada, Spain.
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43
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Bravo M, Llodra JC, Baca P, Osorio E. Effectiveness of visible light fissure sealant (Delton) versus fluoride varnish (Duraphat): 24-month clinical trial. Community Dent Oral Epidemiol 1996; 24:42-6. [PMID: 8833514 DOI: 10.1111/j.1600-0528.1996.tb00811.x] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
The present study compares visible-light Delton with Duraphat fluoride varnish for the prevention of occlusal caries in permanent first molars. A clinical trial was carried out in three groups of 6-8-yr-old schoolchildren: a sealant group (100 children), in which Delton light-polymerized fissure sealant was applied to permanent first molars; a varnish group (98 children), in which Duraphat was applied to permanent first molars; and a control group (116 children). Replacement (sealant) and reapplication (varnish) was carried out every 6 months. Percent effectiveness at 24 months (percentage of saving from caries taking molars as analysis unit) for those molars initially healthy and with complete occlusal eruption was analyzed. 272, 252 and 238 molars met the inclusion criteria in the control, varnish and sealant groups, respectively. Of these, 45.2%, 28.2% and 10.5% developed caries after 24 months. The effectiveness was greater in the sealed molars than in the varnished molars (62.7%).
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Affiliation(s)
- M Bravo
- Department of Preventive Dentistry, School of Dentistry, University of Granada, Spain
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44
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Abstract
Early loss of pit and fissure sealants is considered to be primarily dependent on inadequate isolation of the tooth from salivary contamination during application. Gradual additional loss is considered to be caused by occlusal wear, shearing forces, and marginal failure. Our hypothesis is that the caries risk of the child may be an additional factor in sealant loss. The objective of this study was to analyze the influence of caries history in primary teeth (dft index) on the success of sealants. Delton light-polymerized sealant was applied in 104 six- to eight-year-old children, followed for four years on a six-month-visit basis. All sound permanent first molars were sealed during the study. A survival analysis was used to describe sealant success over time. A Cox proportional hazards regression model was built to test the influence on sealant success of the dft index and site of sealant application (mandibular occlusal surface, maxillary fossae, and maxillary distolingual fissure), controlling for some potential confounders. Sealant half-life was 46 months. Site and dft index were related to sealant survival. The maxillary fossae showed the best retention, followed by the mandibular occlusal site and the maxillary disto-lingual fissure. The higher the dft, the higher the risk of sealant failure. This study has implications for sealant study designs and public sealant programs.
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Affiliation(s)
- M Bravo
- Department of Preventive Dentistry, School of Dentistry, University of Granada, Spain
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45
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Osorio R, Toledano M, Cabrerizo-Vílchez MA, Rosales JI, Bravo M, Osorio E. Influence of enamel prophylaxis on wettability of three commercially available orthophosphoric acids. J Biomed Mater Res 1996; 33:269-74. [PMID: 8953392 DOI: 10.1002/(sici)1097-4636(199624)33:4<269::aid-jbm6>3.0.co;2-n] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
An in vitro study was performed to assess the wettability of orthophosphoric acid after different procedures for cleaning the enamel surface. Ninety noncarious third molars were randomly distributed into three groups with different enamel surface treatments: an air-powder polisher unit, prophylaxis pastes, and no enamel surface cleaning. Three commercially available orthophosphoric acids were used, and there were 10 teeth in each group. Acid viscosity values and contact-angle measurements were obtained. Each enamel surface was also examined with the scanning electron microscope. Results suggested that the surface treatment with which the best spreading of the acid solution was attained was the air-powder polisher. The least spreading of the acid was obtained with prophylaxis pastes, in which contact angles were even higher than those obtained on the untreated enamel surface. The 3M acid solution was the one that showed the best spreading onto the enamel surface.
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Affiliation(s)
- R Osorio
- Department of Dental Materials, University of Granada, Spain
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46
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Abstract
OBJECTIVES The purpose of this study was to evaluate the changes in lymphocyte subpopulations that have led to immune system alterations after amalgam restorations were placed. METHODS A controlled, quasi-experimental pretest-posttest design was used to investigate the immune effects of silver amalgam restorations in a sample of 60 individuals (30 experimental and 30 control subjects) aged 18 to 21 y. Two blood samples were obtained 15 d apart from each participant. In each experimental subject, two amalgam restorations were placed in posterior teeth immediately after the first blood sample was collected. The changes in lymphocyte subpopulations in the two groups were compared by multivariate analysis. RESULTS There was a greater change in T8 lymphocytes in experimental than in control subjects; increases in B, DR, NK, and CD45R lymphocytes were smaller in experimental than in control subjects; the changes in T3 and T4 lymphocytes did not differ significantly between the two groups. SIGNIFICANCE Despite the statistical significance of some differences between the two groups, the differences are not considered to be clinically relevant for the 2 wk time period after placement.
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Affiliation(s)
- E Osorio
- Area of Dental Materials, School of Dentistry, University of Granada, Spain
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47
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Ruiz E, Osorio E, Ortega E. Effect of naloxone in the median eminence on gonadotrophin secretion in intact male rats. Biochem Mol Biol Int 1993; 31:889-95. [PMID: 8136706] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
To evaluate whether the median eminence (ME) is a site of action of opioids on gonadotropin secretion, we injected naloxone into the ME in male rats and measured LH and FSH serum levels. Injection into the ME of either 0.5 or 1 microgram of naloxone significantly decreased serum LH levels 10 and 30 min postinjection. A dose of 0.1 microgram had not effect. Naloxone at the doses used had no significant effect on FSH secretion. From these data it can be concluded that endogenous opioids exert a tonic stimulation on LH secretion under our experimental conditions.
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Affiliation(s)
- E Ruiz
- Department of Biochemistry and Molecular Biology, Faculty of Medicine, University of Granada, Spain
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48
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Ruiz E, Osorio R, Osorio E, Ortega E. Modulation of LH secretion by progesterone and estradiol after naloxone injection in the median eminence. Biochem Mol Biol Int 1993; 30:1093-100. [PMID: 8220255] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
To evaluate whether the median eminence (ME) is a site of action of opioids on gonadotropin secretion, and to determinate the role of estradiol (E) and progesterone (P) in modifying these secretion in response to naloxone, we injected naloxone (1, 2.5 and 5 micrograms) into the ME in ovariectomized rats treated with estradiol benzoate (OVX+E) or ovariectomized rats treated with estradiol benzoate plus progesterone (OVX+E+P), and measured LH and FSH serum levels 10 and 30 min postinjection. Naloxone injection at doses of 2.5 and 5 micrograms significantly increased serum LH levels in OVX+E animals 10 and 30 min postinjection, whereas naloxone injection at all doses in OVX+E+P rats did not have any significant effect on LH secretion 10 and 30 min postinjection, when compared with values obtained in controls injected with saline. The injection of naloxone into the ME did not modify FSH secretion. We conclude that naloxone, acting within the ME, can elicit LH release in OVX+E rats, while it abolishes this effect in OVX+E+P rats.
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Affiliation(s)
- E Ruiz
- Department of Biochemistry and Molecular Biology, Faculty of Medicine, University of Granada, Spain
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49
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Ruiz E, Osorio E, Ortega E. Androgenic status in cyclic and postmenopausal women: a comparison between smokers and nonsmokers. Biochem Int 1992; 27:841-5. [PMID: 1417917] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Serum total testosterone (T), free testosterone (fT) sex hormone binding globulin (SHBG), androstenedione (A) and 3 alpha androstanediol glucuronide (3 alpha-diol G) levels as well as serum free androgen index (FAI), fT/T and 3 alpha-diol G/T ratios were measured in premenopausal and cyclic women, grouped according to sexual status and smoking status. Our results showed that serum T, fT, SHBG, A and 3 alpha-diol G levels were lower in cyclic women in the follicular than in the luteal phase of the ovarian cycle, although the differences between these values were not significant. Postmenopausal women had significantly lower values of T, fT, A 3 alpha-diol G, FAI and 3 alpha diolG/T but not SHBG and fT/T than cyclic women. When we compared women smokers and nonsmokers, women smokers had serum levels of T, fT, SHBG, 3 alpha-diol G, and values of FAI, fT/T and 3 alpha-diol G/T, similar to those in nonsmokers. Serum A levels were higher in women smokers than in nonsmokers, although the difference was significant only in postmenopausal women.
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Affiliation(s)
- E Ruiz
- Department of Biochemistry and Molecular Biology, School of Medicine, University of Granada, Spain
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50
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Osorio E. [Contemporary demographic survey of Venezuela]. Rev Geogr Inst Panam Geogr Hist 1985:43-54. [PMID: 12178395] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/26/2023]
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