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1.
Plast Reconstr Surg ; 2024 May 06.
Artigo em Inglês | MEDLINE | ID: mdl-38710099

RESUMO

BACKGROUND: Rib cage remodeling has shown promising aesthetic results as a new technique for body contouring yet risks and complications associated with the procedure have not been well established. The aim of our study is to assess safety, efficacy and patient satisfaction rate associated with a new surgical technique for waistline definition. METHODS: We looked into our records for patients who underwent waist narrowing through a new rib remodeling procedure with osteosynthesis of the 11th and 12th ribs; from October 2022 to June 2023. Follow up was carried out at 1 and 3 months after surgery. Outcomes were evaluated based on waist and hip measures, body images, pain and a patient satisfaction survey. RESULTS: A total of 27 consecutive patients were included in the analysis. Our technique resulted in a significant reduction in waist circumference, as evidenced by a decrease of 12.1 cm and 13.0 cm at the first and third month respectively (p<0.005). A reduction of hip circumference of 6.2 cm and 8.7 cm was also reported. A high patient satisfaction rate was reported. Postoperative complications included only one case of wound dehiscence and one case of mild pain. Pain levels were also reduced, with a mean pain score of 2.4 at week 1 and 0.26 at month 1. CONCLUSION: Rib osteotomy with osteosynthesis emerges as an innovative, safe, and reliable approach for waist narrowing. Our results suggest that this technique can be applied to a wide variety of patients and presents might entail significant advantages compared to those from other techniques. TYPE OF STUDY: Retrospective cohort. Level of Evidence: III.

2.
Adv Healthc Mater ; : e2304103, 2024 Feb 23.
Artigo em Inglês | MEDLINE | ID: mdl-38400540

RESUMO

In this study, layer-by-layer coatings composed of heparin and collagen are proposed as an extracellular mimetic environment on nerve guide conduits (NGC) to modulate the behavior of Schwann cells (hSCs). The authors evaluated the stability, degradation over time, and bioactivity of six bilayers of heparin/collagen layer-by-layer coatings, denoted as (HEP/COL)6 . The stability study reveals that (HEP/COL)6 is stable after incubating the coatings in cell media for up to 21 days. The impact of (HEP/COL)6 on hSCs viability, protein expression, and migration is evaluated. These assays show that hSCs cultured in (HEP/COL)6 have enhanced protein expression and migration. This condition increases the expression of neurotrophic and immunomodulatory factors up to 1.5-fold compared to controls, and hSCs migrated 1.34 times faster than in the uncoated surfaces. Finally, (HEP/COL)6 is also applied to a commercial collagen-based NGC, NeuraGen, and hSC viability and adhesion are studied after 6 days of culture. The morphology of NeuraGen is not altered by the presence of (HEP/COL)6 and a nearly 170% increase of the cell viability is observed in the condition where NeuraGen is used with (HEP/COL)6 . Additionally, cell adhesion on the coated samples is successfully demonstrated. This work demonstrates the reparative enhancing potential of extracellular mimetic coatings.

3.
ACS Omega ; 8(38): 35242-35255, 2023 Sep 26.
Artigo em Inglês | MEDLINE | ID: mdl-37780029

RESUMO

We reported mono and bimetallic ferrocene-based 1,2,3-triazolyl compounds as potential burning rate catalysts in their neutral and ionic forms. All complexes reported here were characterized using 1H and 13C NMR, elemental analysis, and Mössbauer spectroscopy, which was performed for neutral and oxide compounds. The complexes present quasireversible redox potentials with higher oxidative ability than ferrocene and catocene under the same conditions. The complexes were tested as catalysts on the thermal decomposition of ammonium perchlorate (AP) and examined by a differential scanning calorimetry technique to gain further knowledge about their catalytic behavior. Compound 1 causes a decrease of the high-temperature decomposition (HTD) of AP positively, decreasing the decomposition temperature of AP to 345 °C and consequently increasing the energy release to 1939 J·g-1. We took the residues from the pans after testing from the DSC to elucidate the underlying reaction pathways. We obtained the size of the nanostructures formed after thermal decomposition of AP determined by the TEM technique. The diameter and size distribution of iron oxide nanoparticles formed depend on the alkyl sidechain of the triazolium ring, which induces the formation of nanoparticles with a double diameter and size distribution compared to their neutral analogues, suggesting that the possible intermediate for the mechanism degradation of AP by ferrocene derivatives is nanoscale Fe2O3 or similar oxides.

4.
Andes Pediatr ; 93(3): 392-399, 2022 Jun.
Artigo em Espanhol | MEDLINE | ID: mdl-35857010

RESUMO

INTRODUCTION: Respiratory conditions are the most common reason for admission to the neonatal unit for both term and premature newborns. It is known that nutritional imbalances during pregnancy affect the maturation and functional capacity of organs. OBJECTIVE: to describe the pulmonary histomorpholo- gy of newborn rats due to maternal sugar intake by light microscopy. MATERIAL AND METHOD: Twenty 4-week-old female Wistar rats divided into control and experimental groups with sucrose before and during pregnancy were used. At week 15, the females mated with males overnight. We recorded va lues from the body and lung weight of the newborns. The lungs were stained using Hematoxylin and Eosin, Masson's trichrome, Periodic acid-Schiff, and Verhoeff. RESULTS: Newborns from the experi mental group presented significantly lower body and lung weight (6.980 ± 0.493* g, 0.164 ± 0.022* g; *p < 0,05) compared with controls (7.854 ± 0.497 g, 0.189 ± 0.005 g). The lungs of the experimental group showed structural alterations in the lung parenchyma, as well as changes in glycogen deposits, collagen fibers, and elastin compared with the control group. CONCLUSION: Alterations in newborn lung growth and development are associated with maternal sucrose intake. It is important to re member that interventions on the maternal diet have beneficial effects for both the mother and the newborn.


Assuntos
Pulmão , Sacarose , Animais , Animais Recém-Nascidos , Feminino , Masculino , Gravidez , Ratos , Ratos Wistar , Sacarose/farmacologia , Açúcares/farmacologia
5.
Univers Access Inf Soc ; : 1-15, 2022 May 26.
Artigo em Inglês | MEDLINE | ID: mdl-35637697

RESUMO

In video games, the evaluation of the user experience (UX) mainly refers to two main groups of aspects, those that refer to the player that is mainly oriented to make the player feel good while playing and those that refer to the video game that is oriented to make the video game easy to understand and play. The aspects considered that are related to the player are engagement, enjoyment, and flow; the aspects related to video game, usability, and dependability. Virtual reality environments today have changed the paradigm in various fields of application, such as health, education, entertainment, among others. Therefore, it is important to observe the effects of handedness with hand movements in virtual reality environments. This work proposes a model to evaluate and improve the user experience considering player and video game aspects, taking into account handedness with hand movements in virtual reality environments. Player and video game aspects can be added to evaluations of the effect of handedness, especially in virtual reality environments, in order to know the user's behavior in terms of skill, performance, and accuracy, among other features by using a particular hand to perform specific tasks. Next, a case study is presented with two groups of users using a virtual reality environment to perform several user tasks considering the dominant and non-dominant hand. By evaluating the user tasks it is possible to know the levels of engagement, enjoyment, motivation, and usability in a virtual reality environment. Finally, an analysis of results is presented in which several improvements of UX are presented.

6.
Sensors (Basel) ; 21(11)2021 May 30.
Artigo em Inglês | MEDLINE | ID: mdl-34070754

RESUMO

Today, the world is experiencing the COVID-19 health contingency, which prevents people from being exposed to one another and restricts physical contact. Under this context, the use of technology has become an essential tool to face the challenges of daily life, and virtual reality can be an alternative in the development of solutions that effectively support the acquisition of learning skills and knowledge transmission through the execution of tasks designed by multi-disciplinary groups. In addition, it can encourage the user to continue with the acquisition of learning skills in a friendly and fun way in a health and education context. This work proposes the use of virtual reality environments as an alternative to support the learning process in children with special educational needs such as Attention Deficit Hyperactivity Disorder (ADHD) and other associated disorders that occur in basic education. These proposed reality environments are designed under the Lean UX process model and their contents are designed according to expert therapeutic guidelines. As a result of this proposal, a case study is presented in which the user experience is evaluated through the use of an interactive environment to support the special educational needs of elementary school children attending an educational institution in Mexico.


Assuntos
Transtorno do Deficit de Atenção com Hiperatividade , COVID-19 , Realidade Virtual , Transtorno do Deficit de Atenção com Hiperatividade/diagnóstico , Criança , Humanos , México , SARS-CoV-2 , Instituições Acadêmicas
8.
Sensors (Basel) ; 21(4)2021 Feb 22.
Artigo em Inglês | MEDLINE | ID: mdl-33671797

RESUMO

Communicating in social and public environments are considered professional skills that can strongly influence career development. Therefore, it is important to proper train and evaluate students in this kind of abilities so that they can better interact in their professional relationships, during the resolution of problems, negotiations and conflict management. This is a complex problem as it involves corporal analysis and the assessment of aspects that until recently were almost impossible to quantitatively measure. Nowadays, a number of new technologies and sensors have being developed for the capture of different kinds of contextual and personal information, but these technologies were not yet fully integrated inside learning settings. In this context, this paper presents a framework to facilitate the analysis and detection of patterns of students in oral presentations. Four steps are proposed for the given framework: Data collection, Statistical Analysis, Clustering, and Sequential Pattern Mining. Data Collection step is responsible for the collection of students interactions during presentations and the arrangement of data for further analysis. Statistical Analysis provides a general understanding of the data collected by showing the differences and similarities of the presentations along the semester. The Clustering stage segments students into groups according to well-defined attributes helping to observe different corporal patterns of the students. Finally, Sequential Pattern Mining step complements the previous stages allowing the identification of sequential patterns of postures in the different groups. The framework was tested in a case study with data collected from 222 freshman students of Computer Engineering (CE) course at three different times during two different years. The analysis made it possible to segment the presenters into three distinct groups according to their corporal postures. The statistical analysis helped to assess how the postures of the students evolved throughout each year. The sequential pattern mining provided a complementary perspective for data evaluation and helped to observe the most frequent postural sequences of the students. Results show the framework could be used as a guidance to provide students automated feedback throughout their presentations and can serve as background information for future comparisons of students presentations from different undergraduate courses.


Assuntos
Análise de Dados , Aprendizagem , Postura , Estudantes , Comunicação , Humanos
9.
Inorg Chem ; 60(3): 1436-1448, 2021 Feb 01.
Artigo em Inglês | MEDLINE | ID: mdl-33444017

RESUMO

We show the synthesis and characterization of four heterobimetallic compounds derived from s-indacene of general formula [{(CO)3Mn}-s-Ic-{MCp*}]q with M = Fe, Co, Ni, and Ru; q = 0, 1+. The complexes reported here were characterized by 1H and 13C NMR, elemental analysis and FT-IR. Additionally, the X-ray crystal structure of [(CO)3Mn-s-Ic-FeCp*] (1) and Mössbauer spectra are reported. The heterobimetallic compounds exhibit higher quasireversible redox potentials compared with ferrocene and catocene under the same reaction conditions. The complexes were tested as catalysts on the thermal decomposition of ammonium perchlorate examined by a differential scanning calorimetry technique to study their catalytic behavior. Compound (1) causes a decrease of ammonium perchlorate's decomposition temperature to 315 °C, consequently increasing the heat release by 138 J·g-1. Conversely, [{(CO)3Mn}-s-Ic'-{CoCp*}] (2) presents a higher heat release (2462 J·g-1), comparable to catocene.

10.
Sensors (Basel) ; 20(23)2020 Dec 05.
Artigo em Inglês | MEDLINE | ID: mdl-33291394

RESUMO

Tungsten inert gas (TIG) welding is a well-established joining process and offers the user flexibility to weld a large range of materials. Ultra-thin turbine tipping is an important application for TIG welding that is exceptionally challenging due to the wide range of variables needed to accurately control the process: slope times, arc control, travel speed, etc. We offer new insight into weld pool characteristics, utilizing both on- and off-line measurements of weld tracks. High-resolution thermal imaging yields spatially and temporally resolved weld pool phase transitions coupled with post-weld photographs, which gives a novel perspective into the thermal history of a weld. Our imaging system is filtered to measure a 10 nm window at 950 nm and comprises a commercial Sigma lens to produce a near-infrared (NIR) camera. The measured near-infrared radiance is calibrated for temperature over the range of from 800 to 1350 °C.

11.
Sensors (Basel) ; 20(21)2020 Nov 06.
Artigo em Inglês | MEDLINE | ID: mdl-33172039

RESUMO

While technology has helped improve process efficiency in several domains, it still has an outstanding debt to education. In this article, we introduce NAIRA, a Multimodal Learning Analytics platform that provides Real-Time Feedback to foster collaborative learning activities' efficiency. NAIRA provides real-time visualizations for students' verbal interactions when working in groups, allowing teachers to perform precise interventions to ensure learning activities' correct execution. We present a case study with 24 undergraduate subjects performing a remote collaborative learning activity based on the Jigsaw learning technique within the COVID-19 pandemic context. The main goals of the study are (1) to qualitatively describe how the teacher used NAIRA's visualizations to perform interventions and (2) to identify quantitative differences in the number and time between students' spoken interactions among two different stages of the activity, one of them supported by NAIRA's visualizations. The case study showed that NAIRA allowed the teacher to monitor and facilitate the learning activity's supervised stage execution, even in a remote learning context, with students working in separate virtual classrooms with their video cameras off. The quantitative comparison of spoken interactions suggests the existence of differences in the distribution between the monitored and unmonitored stages of the activity, with a more homogeneous speaking time distribution in the NAIRA supported stage.


Assuntos
Educação a Distância/métodos , Betacoronavirus , COVID-19 , Infecções por Coronavirus/patologia , Infecções por Coronavirus/virologia , Retroalimentação , Humanos , Aprendizagem , Aplicativos Móveis , Pandemias , Pneumonia Viral/patologia , Pneumonia Viral/virologia , SARS-CoV-2 , Rede Social , Estudantes
12.
Acta sci., Biol. sci ; 42: e47522, fev. 2020. ilus, tab, graf
Artigo em Inglês | LILACS, VETINDEX | ID: biblio-1460928

RESUMO

Two isolations of fungi from a bank of microorganisms in the Biological Sciences Laboratory at Escuela Superior Politécnica de Chimborazo were tested on the galling caused by Meloidogyne incognita in tomato seedlings grown in pots with substrate infested with a suspension of nematodes, with approximately 2000 juvenile stages (J2) from root galls of plants infested with M. incognita, taken from the Nematology laboratory of the Ecuadorian Agricultural Quality Assurance Agency (AGROCALIDAD). Pleurotus ostreatus was a fungus with nematicidal characteristics through production of toxins; while Trichoderma harzianum is a widely known fungus, although it is a plant growth promoter rather than a nematicide. The two fungi were formulated in wheat straw and rabbit manure. A complete randomized design (CRD) with three replications was used, with a chemical control (Fenamiphos) and an absolute control. Five grams of each formulation was applied per plant before the transplant. The number of galls in the roots, plant height, stem diameter, number of leaves and fresh and dry weight of the aerial part and roots of 180 tomato plants grown in greenhouse were evaluated at 60 days after transplant. The results showed that the two fungi reduced the number of galls and made it possible to obtain dry weights of the aerial and radicular part very close to the chemical control (10.09 and 3.39 g) with 8.68; 8.04; 2.96 and 3.25 g respectively. Besides Trichoderma harzianum proved to be a good promoter of root growth, therefore, the use of these bioformulates is a promising measure for the control of this phytonematode


Assuntos
Solanum lycopersicum , Pleurotus , Trichoderma , Tylenchoidea
13.
Pathogens ; 8(4)2019 Dec 02.
Artigo em Inglês | MEDLINE | ID: mdl-31810203

RESUMO

Macrophages that are classically activated (M1) through the IFN-γ/STAT1 signaling pathway have a major role in mediating inflammation during microbial and parasitic infections. In some cases, unregulated inflammation induces tissue damage. In helminth infections, alternatively activated macrophages (M2), whose activation occurs mainly via the IL-4/STAT6 pathway, have a major role in mediating protection against excessive inflammation, and has been associated with both tissue repair and parasite clearance. During the lung migratory stage of Toxocara canis, the roles of M1 and M2 macrophages in tissue repair remain unknown. To assess this, we orally infected wild-type (WT) and STAT1 and STAT6-deficient mice (STAT1-/- and STAT6-/-) with L2 T. canis, and evaluated the role of M1 or M2 macrophages in lung pathology. The absence of STAT1 favored an M2 activation pattern with Arg1, FIZZ1, and Ym1 expression, which resulted in parasite resistance and lung tissue repair. In contrast, the absence of STAT6 induced M1 activation and iNOS expression, which helped control parasitic infection but generated increased inflammation and lung pathology. Next, macrophages were depleted by intratracheally inoculating mice with clodronate-loaded liposomes. We found a significant reduction in alveolar macrophages that was associated with higher lung pathology in both WT and STAT1-/- mice; in contrast, STAT6-/- mice receiving clodronate-liposomes displayed less tissue damage, indicating critical roles of both macrophage phenotypes in lung pathology and tissue repair. Therefore, a proper balance between inflammatory and anti-inflammatory responses during T. canis infection is necessary to limit lung pathology and favor lung healing.

14.
Sensors (Basel) ; 19(15)2019 Jul 26.
Artigo em Inglês | MEDLINE | ID: mdl-31357476

RESUMO

Currently, the improvement of core skills appears as one of the most significant educational challenges of this century. However, assessing the development of such skills is still a challenge in real classroom environments. In this context, Multimodal Learning Analysis techniques appear as an attractive alternative to complement the development and evaluation of core skills. This article presents an exploratory study that analyzes the collaboration and communication of students in a Software Engineering course, who perform a learning activity simulating Scrum with Lego® bricks. Data from the Scrum process was captured, and multidirectional microphones were used in the retrospective ceremonies. Social network analysis techniques were applied, and a correlational analysis was carried out with all the registered information. The results obtained allowed the detection of important relationships and characteristics of the collaborative and Non-Collaborative groups, with productivity, effort, and predominant personality styles in the groups. From all the above, we can conclude that the Multimodal Learning Analysis techniques offer considerable feasibilities to support the process of skills development in students.

15.
Odovtos (En línea) ; 21(1): 31-40, Jan.-Apr. 2019. tab, graf
Artigo em Inglês | LILACS, BBO - Odontologia | ID: biblio-1091469

RESUMO

Abstract 20. The success of tissue engineering in combination with tissue regeneration depends on the behavior and cellular activity in the biological processes developed within a structure that functions as a support, better known as scaffolds, or directly at the site of the injury. The cell-cell and cell-biomaterial interaction are key factors for the induction of a specific cell behavior, together with the bioactive factors that allow the formation of the desired tissue. Mesenchymal Stem Cells (MSC) can be isolated from the umbilical cord and bone marrow; however, the behavior of Dental Pulp Stem Cells (DPSC) has been shown to have a high potential for the formation of bone tissue, and these cells have even been able to induce the process of angiogenesis. Advances in periodontal regeneration, dentin-pulp complex, and craniofacial bone defects through the induction of MSC obtained from tooth structures in in vitro-in vivo studies have permitted the obtaining of clinical evidence of the achievements obtained to date.


Resumen 24. El éxito de la ingeniería de tejidos en combinación con la regeneración de tejidos depende del comportamiento y la actividad celular en los procesos biológicos desarrollados dentro de una estructura que funciona como soporte mejor conocida como andamio o directamente en el sitio de la lesión. La interación célula-célula y célula-biomaterial son factores claves para la inducción a un comportamiento célular específico junto con factores bioactivos que permitan la formación del tejido deseado. Las células troncales mesenquimales (MSCs) pueden ser aisladas del cordón umbilical y de la medula ósea, sin embargo, el comportamiento de las células troncales de pulpa dental (DPSCs) han demostrado tener un alto potencial para la formación de tejido óseo e incluso han logrado inducir el proceso de angiogénesis. Avances en la regeneración periodontal, complejo dentino-pulpar y defectos óseos craneofaciales a travez de la inducción de MSCs obtenidas de estructuras de dientes en estudios in vitro-in vivo han permitido obtener evidencia clínica de los logros obtenidos hasta el momento.


Assuntos
Regeneração Tecidual Guiada Periodontal , Polpa Dentária , Alicerces Teciduais , Nicho de Células-Tronco , Células-Tronco Mesenquimais
16.
Odovtos (En línea) ; 21(1): 15-21, Jan.-Apr. 2019. tab, graf
Artigo em Inglês | LILACS, BBO - Odontologia | ID: biblio-1091467

RESUMO

Abstract 24. Dental trauma, mainly from the anterior area of the mouth in the incisor teeth at the level of the radicular third, has the extraction of the dental organ as an elective treatment, depending on the severity of the lesion and the site where it presented. This paper reports two cases: one in a young 13-year-old male patient with dental trauma in central incisors, and another in an 18-year-old female patient with radicular reabsorption in central incisors. Both were treated using trans-endodontic implants on teeth 2.1 and 1.1-2.2 each case, respectively. The treatment approach proposed for each case provided good functional and esthetic outcomes. Clinical and radiographic results after 1 year were successful.


Resumen 28. El traumatismo dental del área anterior de la boca en los dientes incisivos a nivel del tercio radicular, indica la extracción del órgano dental como un tratamiento electivo dependiendo de la gravedad de la lesión y el sitio donde se presentó. Este artículo reporta dos casos: uno en un paciente masculino joven de 13 años con trauma dental en los incisivos centrales y otro en una paciente de 18 años con reabsorción radicular en los incisivos centrales. Ambos fueron tratados con implantes trans-endodónticos en los dientes 2.1 y 1.1-2.2 en cada caso, respectivamente. El enfoque de tratamiento propuesto para cada caso proporcionó buenos resultados funcionales y estéticos. Los resultados clínicos y radiográficos después de 1 año fueron exitosos.


Assuntos
Humanos , Masculino , Feminino , Adolescente , Reabsorção da Raiz/cirurgia , Implantes Dentários , Traumatismos Dentários , Implantação Dentária
17.
P R Health Sci J ; 38(4): 237-243, 2019 12.
Artigo em Inglês | MEDLINE | ID: mdl-31935309

RESUMO

OBJECTIVE: The present study assessed cytotoxicity, cell adhesion, and apoptotic gene expression in periodontal ligament fibroblasts (PLF) treated with 2 endodontic sealers. METHODS: PLF cells were obtained from nonerupted third molars and cultured. MTS and LIVE/DEAD assays were performed using different treatments and time periods. Cellular adhesion was evaluated using immunocytochemistry for integrin ß1 and vinculin expression, and the gene expressions of nuclear factor kB (NF-кB), P53, and apoptotic protease-activating factor 1 (Apaf-1) were evaluated using PCR. RESULTS: Cell proliferation at 12, 24, and 48 h was statistically significant in the control and PLF groups receiving different treatments; PLF treated with culture medium containing non-hardened (NH) sealers showed a decrease in the number of cells. PLF treated with culture medium containing hardened (H) sealers also exhibited a decreased cell population. Integrin ß1 and vinculin were expressed in both cell cultures treated with Acroseal (NH and H); however, the cell morphology changed and the cell population decreased. The gene expression of NF-kB and that of P53 were significantly different between the control group and the groups treated with the different sealers; mineral trioxide aggregate (MTA) (NH and H) inhibited Apaf-1, and PLF treated with Acroseal H exhibited increased Apaf-1 expression. CONCLUSION: Both sealers showed a certain level of cytotoxicity. The gene expression of NF-κB and P53 in PLF treated with the sealers showed significant changes compared to that of the control group, and MTA inhibited Apaf-1.


Assuntos
Apoptose/efeitos dos fármacos , Adesão Celular/efeitos dos fármacos , Fibroblastos/efeitos dos fármacos , Materiais Restauradores do Canal Radicular/toxicidade , Compostos de Alumínio/toxicidade , Fator Apoptótico 1 Ativador de Proteases/genética , Compostos de Cálcio/toxicidade , Proliferação de Células/efeitos dos fármacos , Células Cultivadas , Combinação de Medicamentos , Fibroblastos/citologia , Regulação da Expressão Gênica/efeitos dos fármacos , Humanos , NF-kappa B/genética , Óxidos/toxicidade , Ligamento Periodontal/citologia , Silicatos/toxicidade , Fatores de Tempo , Proteína Supressora de Tumor p53/genética
18.
Odovtos (En línea) ; 20(2): 81-89, May.-Aug. 2018. graf
Artigo em Inglês | LILACS, BBO - Odontologia | ID: biblio-1091449

RESUMO

Abstract Trans-endodontic implants are an artificial extension through root apex anchored in periradicular bone tissue. The aim is to improve the crown-root ratio and to provide stability to dental organ present. Zirconium oxide (ZrO2) is a material of great technological importance, having good natural color, high strength, high toughness, high chemical stability, does not suffer any corrosion, chemical and microbial resistance and excellent esthetic properties. Objective: The aim of this study was to evaluate chemical and microscopy of surface conditions of ZrO2 trans-endodontic implant. Materials and Methods: A blocks of ZrO2 were manufactured for produce trans-endodontic implants and divided in two groups: monoclinic and tetragonal phase. They were evaluated using Scanning Electroning Microscope (SEM), EnergyDispersive X-ray Spectroscopy (EDS), and Atomic Force Microscope (AFM) and Vickers Micro hardness. Results: The Monoclinic phase through AFM analysis showed roughness Ra = 0.320μm, whereas in the Tetragonal phase was 0.126μm, SEM/EDX indicated that the phases are not properly uniform and the addition of the Yttrium to favor the stabilization of the Tetragonal phase. The Vickers hardness analysis showed a value of 1500HV. Conclusion: The characterization of the surface of trans-endodontic zirconium oxide implants provides a guideline to know the surface characteristics of the material, since a greater roughness on the surface of the implant will favor the Osseo-integration capacity.


Resumen Los implantes trans-endodónticos son una extensión artificial a través del ápice radicular anclado en el tejido óseo periradicular. El objetivo es mejorar la relación corona-raíz y proporcionar estabilidad al órgano dental presente. El óxido de zirconio (ZrO2) es un material de gran importancia tecnológica, con buen color natural, alta resistencia, alta tenacidad, alta estabilidad química, no sufre corrosión, resistencia química y microbiana y excelentes propiedades estéticas. Objetivo: El objetivo de este estudio fue evaluar las condiciones superficiales de ZrO2 para su aplicación clínica a los implantes transendodónticos. Materiales y Métodos: se trituraron bloques de ZrO2 en implantes trans-endodónticos y se dividieron en: monoclínico y tetragonal. Luego se evaluaron mediante microscopía electrónica de barrido (SEM), espectroscopia de rayos X de energía dispersiva (EDS) y microscopio de fuerza atómica (AFM) y microdureza vickers. Resultados: La fase monoclínica a través del análisis AFM presenta Ra = 0.320 μm, mientras que en la fase Tetragonal es 0.126 μm, SEM / EDS muestra que las fases no son adecuadamente uniformes y la adición del Ytrio para favorecer la estabilización de la fase tetragonal. El análisis de microdureza mostro un valor de 1500HV. Conclusión: La caracterización de la superficie de los implantes trans-endodónticos de óxido de zirconio, brinda una pauta para conocer las características superficiales del material, ya que al haber una mayor rugosidad en la superficie del implante se verá favorecida la capacidad de oseointegración.


Assuntos
Espectrometria por Raios X , Zircônio/uso terapêutico , Implantes Dentários/microbiologia
19.
J Avian Med Surg ; 32(2): 144-151, 2018 06.
Artigo em Inglês | MEDLINE | ID: mdl-29905097

RESUMO

The population of the Central American scarlet macaw ( Ara macao cyanoptera) and other parrots have and continue to decline throughout the region largely from poaching to supply the illegal wildlife trade. Conservation efforts address this issue through protection efforts, including community patrols and government engagement, as well as nest monitoring, rescue and release operations, capacity building, and education and consciousness raising programs, all of which rely on long-lasting relationships and commitment. Using these principles, in 2010, a coalition of people came together, including the authors, to build a conservation program against overwhelming odds and with surprising success.


Assuntos
Conservação dos Recursos Naturais/métodos , Espécies em Perigo de Extinção , Papagaios/fisiologia , Animais , Honduras
20.
Rev. cuba. endocrinol ; 28(3): 1-15, set.-dic. 2017. tab
Artigo em Espanhol | CUMED | ID: cum-73070

RESUMO

Introducción: la dislipidemia constituye un factor de riesgo vascular frecuente en la diabetes tipo 2. Objetivo: identificar la relación entre las alteraciones lipídicas y el riesgo vascular en la diabetes tipo 2. Métodos: estudio transversal y correlacional de 111 personas con diabetes tipo 2 y dislipidemia (41 con primaria y 70 con secundaria), atendidas en el Centro de Atención al Diabético del Instituto Nacional de Endocrinología, durante 2014-2015. Se analizaron las variables: edad, sexo, tabaquismo, índice de masa corporal, circunferencia de cintura, índices cintura-cadera y cintura-talla, presión arterial sistólica y de pulso, colesteroles total, lipoproteínas de baja densidad y las lipoproteínas de alta densidad, triglicéridos, apoproteínas A y B, hemoglobina glucosilada, complejo íntima-media carotídeo y riesgo cardiovascular por tablas de la OMS y Gaziano. Para comparar variables cualitativas (porcentaje), se utilizó prueba de Fisher y para cuantitativas ( ± DE), U de Mann-Whitney. Para todos los análisis, se asumió una p< 0,05. Resultados: la disminución de lipoproteínas de alta densidad-colesterol fue la alteración de fracción lipídica que más se relacionó con alteración de variables clínicas y bioquímicas, para ambas dislipidemias. La dislipidemia primaria se asoció con mayor riesgo cardiovascular según tablas de la OMS (p= 0,015). Conclusiones: la dislipidemia primaria y la disminución de lipoproteínas de alta densidad-colesterol se relacionaron con mayor riesgo vascular(AU)


Introduction: dyslipidemia is a frequent vascular risk factor in type 2 diabetes. Objective: to identify the relation between lipid alterations and vascular risk in type 2 diabetes. Methods: cross-sectional and correlational study of 111 people with type 2 diabetes and dyslipidemia (41 of them with primary and 70 with secondary) attended at the Diabetics Care Center of the National Institute of Endocrinology during 2014-2015. The variables analyzed were: age, sex, smoking habit, body mass index, waist circumference, waist-hip and waist-height indexes, systolic and pulse blood pressure, total cholesterol, low density lipoproteins and high density lipoproteins, triglycerides, apoproteins A and B, glycosylated hemoglobin, carotid intima-media complex; and cardiovascular risk by WHO and Gaziano tables. To compare qualitative variables (percentage), Fisher's test was used, and for quantitative ( ± DE), Mann-Whitney U. For all analyzes, a p< 0.05 was assumed. Results: the decrease of high density-cholesterol´s lipoproteins was the alteration of lipid fraction that was more related to the alteration of clinical and biochemical variables, for both dyslipidemias. Primary dyslipidemia was associated with a higher cardiovascular risk according to WHO tables (p= 0.015). Conclusions: primary dyslipidemia and the decrease of high density-cholesterol´s lipoproteins were associated with a higher vascular risk(AU)


Assuntos
Humanos , Fatores de Risco , Diabetes Mellitus Tipo 2/epidemiologia , Angiopatias Diabéticas/etiologia , Dislipidemias/etiologia , Estudos de Avaliação como Assunto/estatística & dados numéricos , Estudos Transversais , Interpretação Estatística de Dados
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