A influência do tabagismo na osseointegração de implantes dentários: uma revisão sistemática

Introdução: O tabagismo é um fator de risco amplamente reconhecido para uma variedade de problemas de saúde, mas seu impacto específico nos implantes dentários e tecidos peri-implantares tem se tornado uma área de crescente interesse. A osseointegração bem-sucedida e a saúde dos tecidos ao redor dos implantes são cruciais para o sucesso de procedimentos de implantes dentários, e compreender como o tabagismo afeta esses aspectos é de grande importância. Objetivos: Este estudo tem como objetivo geral realizar uma revisão de literatura abrangente e crítica para investigar os principais efeitos do tabagismo sobre os tecidos implantares, bem como suas possíveis consequências para o tratamento reabilitador com implantes dentários.  Materiais e métodos: Para atingir os objetivos, foram analisados sete artigos publicados no período de 2017 a 2023, que abordaram o impacto do tabagismo em implantes dentários e tecidos peri-implantares. Fez-se uma revisão sistemática desses estudos, avaliando suas metodologias, resultados e conclusões. Resultados: A análise revelou que o tabagismo exerce um efeito negativo substancial na saúde dos implantes dentários e na osseointegração. Os estudos investigados demonstraram uma correlação significativa entre o tabagismo e complicações em torno dos implantes, incluindo perda óssea marginal, inflamação peri-implantar e um maior risco de desenvolver doenças peri-implantares. Essas conclusões ressaltam a importância de considerar o histórico de tabagismo ao avaliar a adequação de pacientes para procedimentos de implantes dentários. Discussão: A relação entre o tabagismo e os resultados adversos em implantes dentários é complexa e multifacetada. Diferentes estudos abordaram essa questão com métodos variados, mas todos apontaram para o tabagismo como um fator de risco significativo. As divergências nos detalhes dos resultados refletem a necessidade de uma abordagem personalizada ao avaliar pacientes fumantes em relação a implantes dentários. Conclusão: Concluímos que o tabagismo representa um desafio significativo para a saúde e a integração de implantes dentários. Profissionais de saúde bucal devem estar atentos aos impactos adversos do tabagismo, informando seus pacientes sobre esses efeitos prejudiciais à saúde oral

Detecting microorganisms producing surface active compounds in mangrove sediments in São Luís, Maranhão

Mangroves are areas of sediment transitions, favoring the cycling of materials associated with high concentration of microorganisms, presenting vulnerability to anthropogenic actions. The objective of this study was to evaluate the ability of microbiota in mangrove sediments of the Anil River, in the city of São Luís, Maranhão. To produce surface active compounds (SACs), samples were collected according to the EMBRAPA methodology by inoculating them in the Bushnell Haas medium, with carbon sources varying at 3% (v/v). From the production obtained, the supernatants of each culture were submitted to E24 analysis, drop spreading, thermal stability/pressure and pH variation. The SAC-producing species were identified using the MALDI-QTOF MS method. The producing species were identified as Serratia marcescens (2), Ochrobactrum spp. (3). E24 values ranged from 33% to 48% yield, with stability increase after autoclaving of 3% to 6% and of 17% for basic pH ranges, demonstrating the feasibility of using regional microorganisms present in mangroves to produce SACs from different carbon sources, as they have good rates of emulsification and stability to the diverse environmental factors

Culturable bacteria associated with Anopheles darlingi and their paratransgenesis potential

Background Malaria remains a major public health problem in South America, mostly in the Amazon region. Among newly proposed ways of controlling malaria transmission to humans, paratransgenesis is a promising alternative. Paratransgenesis aims to inhibit the development of parasites within the vector through the action of genetically modified bacteria. The first step towards successful paratransgenesis in the Amazon is the identification of Anopheles darlingi symbiotic bacteria, which are transmitted vertically among mosquitoes, and are not pathogenic to humans. Methods Culturable bacteria associated with An. darlingi and their breeding sites were isolated by conventional microbiological techniques. Isolated strains were transformed with a GFP expressing plasmid, pSPT-1-GFP, and reintroduced in mosquitoes by feeding. Their survival and persistence in the next generation was assessed by the isolation of fluorescent bacteria from eggs, larvae, pupae and adult homogenates. Results A total of 179 bacterial strains were isolated from samples from two locations, Coari and Manaus. The predominant genera identified in this study were Acinetobacter, Enterobacter, Klebsiella, Serratia, Bacillus, Elizabethkingia, Stenotrophomonas and Pantoea. Two isolated strains, Serratia-Adu40 and Pantoea-Ovo3, were successfully transformed with the pSPT-1-GFP plasmid and expressed GFP. The fluorescent bacteria fed to adult females were transferred to their eggs, which persisted in larvae and throughout metamorphosis, and were detected in adult mosquitoes of the next generation. Conclusion Serratia-Adu40 and Pantoea-Ovo3 are promising candidates for paratransgenesis in An. darlingi. Further research is needed to determine if these bacteria are vertically transferred in nature

Zika: abordagem clínica na atenção básica

Zika é uma doença que foi detectada no país no último ano, a partir deste evento a doença tem se disseminado no país, cursando de forma inédita segundo a literatura científica. Tendo encontrado ambiente favorável à sua disseminação, que é a presença do vetor Aedes em todo o país, em população sem imunidade à doença, vem causando enorme impacto à saúde de nossa população. É preciso que os profissionais de saúde se capacitem para conseguir minimizar o impacto desta enfermidade, utilizando todos os recursos possíveis para assistir, disseminar os conhecimentos para a população, além de construir parcerias com todos os equipamentos sociais para atuarem no sentido de proteger a saúde de todos. Para isso este material foi elaborado, tendo o caráter auto-instrucional, os profissionais de saúde podem realizá-lo dentro de suas possibilidades. O módulo tem 45h, sendo dividido em quatro unidades de ensino; ao final oferece uma avaliação objetiva e a certificação on-line. Na biblioteca estão disponibilizados livros e vídeos com conteúdos referentes ao tema, utilize-os se sentir necessidade de aprofundar seus conhecimentos.1.

Nasal polyposis : more than a chronic inflammatory disorder : a disease of mechanical dysfunction : the São Paulo position

Introduction The importance of our study lies in the fact that we have demonstrated the occurrence of mechanical dysfunction within polypoid tissues, which promotes the development of polyps in the nasal cavity. Objective To change the paradigm of nasal polyposis (NP). In this new conception, the chronic nasal inflammatory process that occurs in response to allergies, to pollution, to changes in the epithelial barrier, or to other factors is merely the trigger of the development of the disease in individuals with a genetic predisposition to an abnormal tissue remodeling process, which leads to a derangement of the mechanical properties of the nasal mucosa and, consequently, allows it to grow unchecked. Data Synthesis We propose a fundamentally new approach to intervening in the pathological process of NP, addressing biomechanical properties, fluid dynamics, and the concept of surface tension. Conclusion The incorporation of biomechanical knowledge into our understanding of NP provides a new perspective to help elucidate the physiology and the pathology of nasal polyps, and new avenues for the treatment and cure of NP

Incorporating biodiversity responses to land use change scenarios for preventing emerging zoonotic diseases in areas of unknown host-pathogen interactions

The need to reconcile food production, the safeguarding of nature, and the protection of public health is imperative in a world of continuing global change, particularly in the context of risks of emerging zoonotic disease (EZD). In this paper, we explored potential land use strategies to reduce EZD risks using a landscape approach. We focused on strategies for cases where the dynamics of pathogen transmission among species were poorly known and the ideas of “land-use induced spillover” and “landscape immunity” could be used very broadly. We first modeled three different land-use change scenarios in a region of transition between the Cerrado and the Atlantic Forest biodiversity hotspots. The land-use strategies used to build our scenarios reflected different proportions of native vegetation cover, as a proxy of habitat availability. We then evaluated the effects of the proportion of native vegetation cover on the occupancy probability of a group of mammal species and analyzed how the different land-use scenarios might affect the distribution of species in the landscape and thus the risk of EZD. We demonstrate that these approaches can help identify potential future EZD risks, and can thus be used as decision-making tools by stakeholders, with direct implications for improving both environmental and socio-economic outcomes

Energy Estimation of Cosmic Rays with the Engineering Radio Array of the Pierre Auger Observatory

The Auger Engineering Radio Array (AERA) is part of the Pierre Auger Observatory and is used to detect the radio emission of cosmic-ray air showers. These observations are compared to the data of the surface detector stations of the Observatory, which provide well-calibrated information on the cosmic-ray energies and arrival directions. The response of the radio stations in the 30 to 80 MHz regime has been thoroughly calibrated to enable the reconstruction of the incoming electric field. For the latter, the energy deposit per area is determined from the radio pulses at each observer position and is interpolated using a two-dimensional function that takes into account signal asymmetries due to interference between the geomagnetic and charge-excess emission components. The spatial integral over the signal distribution gives a direct measurement of the energy transferred from the primary cosmic ray into radio emission in the AERA frequency range. We measure 15.8 MeV of radiation energy for a 1 EeV air shower arriving perpendicularly to the geomagnetic field. This radiation energy -- corrected for geometrical effects -- is used as a cosmic-ray energy estimator. Performing an absolute energy calibration against the surface-detector information, we observe that this radio-energy estimator scales quadratically with the cosmic-ray energy as expected for coherent emission. We find an energy resolution of the radio reconstruction of 22% for the data set and 17% for a high-quality subset containing only events with at least five radio stations with signal.Comment: Replaced with published version. Added journal reference and DO

Measurement of the Radiation Energy in the Radio Signal of Extensive Air Showers as a Universal Estimator of Cosmic-Ray Energy

We measure the energy emitted by extensive air showers in the form of radio emission in the frequency range from 30 to 80 MHz. Exploiting the accurate energy scale of the Pierre Auger Observatory, we obtain a radiation energy of 15.8 \pm 0.7 (stat) \pm 6.7 (sys) MeV for cosmic rays with an energy of 1 EeV arriving perpendicularly to a geomagnetic field of 0.24 G, scaling quadratically with the cosmic-ray energy. A comparison with predictions from state-of-the-art first-principle calculations shows agreement with our measurement. The radiation energy provides direct access to the calorimetric energy in the electromagnetic cascade of extensive air showers. Comparison with our result thus allows the direct calibration of any cosmic-ray radio detector against the well-established energy scale of the Pierre Auger Observatory.Comment: Replaced with published version. Added journal reference and DOI. Supplemental material in the ancillary file