RESUMO

INTRODUCTION: This study investigated the role of early public research funding regarding the COVID-19 pandemic in Brazil. METHODS: We examined the budget for research projects relating to the number of cases and deaths and the relationship between each federal unit, gross domestic product (GDP) per capita, and the national GDP per capita. RESULTS: Using data from the websites of official funding agencies and the Brazilian government, we found that, in the first four months since the first case in Wuhan, China (December 31, 2019), around US$ 38.3 million were directed to public funding for scientific investigations against the COVID-19 pandemic. However, only 11 out of 27 federal units provided funding during the initial stages of the outbreak, and those that did provide financing were not necessarily the units having the most inhabitants, highest GDP, or the greatest number of cases. The areas of research interest were also identified in the funding documents; the most common topic was "diagnosis" and the least common was "equipment for treatment." CONCLUSIONS: Brazilian researchers had access to funding opportunities for projects against COVID-19. However, strategies to minimize the economic impacts of COVID-19 are crucial in mitigating or avoiding substantial financial and social shortcomings, particularly in terms of an emerging market such as Brazil.

Assuntos

RESUMO

This study compared Zr-Mo alloys with commercial metallic biomaterials. It was observed that the Zr-Mo alloys exhibited favourable mechanical properties, particularly the Zr-10Mo alloy, which showed the highest strength to Young's modulus ratio among all evaluated metals. These alloys also exhibited the lowest magnetic susceptibilities, which are important for magnetic resonance imaging (MRI). However, both Zr- and Ti-based metals yielded comparable artifacts. It was concluded that the magnetic susceptibility must differ considerably to afford significantly improved MRI quality owing to the increased importance of non-susceptibility-related artifacts when comparing materials with relatively similar magnetic susceptibilities.

RESUMO

Abstract INTRODUCTION: This study investigated the role of early public research funding regarding the COVID-19 pandemic in Brazil. METHODS: We examined the budget for research projects relating to the number of cases and deaths and the relationship between each federal unit, gross domestic product (GDP) per capita, and the national GDP per capita. RESULTS: Using data from the websites of official funding agencies and the Brazilian government, we found that, in the first four months since the first case in Wuhan, China (December 31, 2019), around US$ 38.3 million were directed to public funding for scientific investigations against the COVID-19 pandemic. However, only 11 out of 27 federal units provided funding during the initial stages of the outbreak, and those that did provide financing were not necessarily the units having the most inhabitants, highest GDP, or the greatest number of cases. The areas of research interest were also identified in the funding documents; the most common topic was "diagnosis" and the least common was "equipment for treatment." CONCLUSIONS: Brazilian researchers had access to funding opportunities for projects against COVID-19. However, strategies to minimize the economic impacts of COVID-19 are crucial in mitigating or avoiding substantial financial and social shortcomings, particularly in terms of an emerging market such as Brazil.

Assuntos

RESUMO

OBJECTIVES: This paper aims to evaluate in vitro the mechanical and microstructural properties of internal fixation systems used in oral and maxillofacial surgeries. MATERIALS AND METHODS: Four brands of internal fixation systems (screws and 4-hole straight plates) were selected and assigned to four groups: G1 Leibinger®, G2 Tóride®, G3 Engimplan®, and G4 Medartis®. The systems were submitted to Vickers hardness testing, metallographic and interstitial elements chemical composition analyses. Data were submitted to ANOVA and Tukey's test for statistical analysis. RESULTS: Plates in groups 1, 2, and 3 showed similar microstructure and mechanical properties, different from those in G4 revealing larger grains. In all groups, the screws showed similar microstructure, with uniform arrangement and size of grains; the screws showed higher hardness values than those observed for the plates. CONCLUSIONS: The results indicate that all materials tested are adequate for use in oral maxillofacial surgeries.

Assuntos

RESUMO

PURPOSE: To investigate the osseointegration properties of prototyped implants with tridimensionally interconnected pores made of the Ti6Al4V alloy and the influence of a thin calcium phosphate coating. METHODS: Bilateral critical size calvarial defects were created in thirty Wistar rats and filled with coated and uncoated implants in a randomized fashion. The animals were kept for 15, 45 and 90 days. Implant mechanical integration was evaluated with a push-out test. Bone-implant interface was analyzed using scanning electron microscopy. RESULTS: The maximum force to produce initial displacement of the implants increased during the study period, reaching values around 100N for both types of implants. Intimate contact between bone and implant was present, with progressive bone growth into the pores. No significant differences were seen between coated and uncoated implants. CONCLUSION: Adequate osseointegration can be achieved in calvarial reconstructions using prototyped Ti6Al4V Implants with the described characteristics of surface and porosity.

Assuntos

RESUMO

PURPOSE: To investigate the osseointegration properties of prototyped implants with tridimensionally interconnected pores made of the Ti6Al4V alloy and the influence of a thin calcium phosphate coating. METHODS: Bilateral critical size calvarial defects were created in thirty Wistar rats and filled with coated and uncoated implants in a randomized fashion. The animals were kept for 15, 45 and 90 days. Implant mechanical integration was evaluated with a push-out test. Bone-implant interface was analyzed using scanning electron microscopy. RESULTS: The maximum force to produce initial displacement of the implants increased during the study period, reaching values around 100N for both types of implants. Intimate contact between bone and implant was present, with progressive bone growth into the pores. No significant differences were seen between coated and uncoated implants. CONCLUSION: Adequate osseointegration can be achieved in calvarial reconstructions using prototyped Ti6Al4V Implants with the described characteristics of surface and porosity. .

Assuntos

RESUMO

PURPOSE:To investigate the osseointegration properties of prototyped implants with tridimensionally interconnected pores made of the Ti6Al4V alloy and the influence of a thin calcium phosphate coating.METHODS:Bilateral critical size calvarial defects were created in thirty Wistar rats and filled with coated and uncoated implants in a randomized fashion. The animals were kept for 15, 45 and 90 days. Implant mechanical integration was evaluated with a push-out test. Bone-implant interface was analyzed using scanning electron microscopy.RESULTS:The maximum force to produce initial displacement of the implants increased during the study period, reaching values around 100N for both types of implants. Intimate contact between bone and implant was present, with progressive bone growth into the pores. No significant differences were seen between coated and uncoated implants.CONCLUSION:Adequate osseointegration can be achieved in calvarial reconstructions using prototyped Ti6Al4V Implants with the described characteristics of surface and porosity.(AU)

Assuntos