Mechanical behavior and failure mode of body-centered cubic, gyroid, diamond, and Voronoi functionally graded additively manufactured biomedical lattice structures.

Given the capability to produce parts with complex geometries, powder bed fusion using a laser beam (PBF-LB), one of several additive manufacturing techniques, is becoming increasingly prevalent in both research and industry. Advances in the development of biomedical lattice structures show a trend in the use of functional gradients for greater customization and adjustment of mechanical properties according to the demands. This study analyzed four biomedical potential lattice structures (regular and graded) manufactured using PBF-LB in Ti6Al4V alloy.

Extracellular matrix-derived and low-cost proteins to improve polyurethane-based scaffolds for vascular grafts.

Vascular graft surgeries are often conducted in trauma cases, which has increased the demand for scaffolds with good biocompatibility profiles. Biodegradable scaffolds resembling the extracellular matrix (ECM) of blood vessels are promising vascular graft materials. In the present study, polyurethane (PU) was blended with ECM proteins collagen and elastin (Col-El) and gelatin (Gel) to produce fibrous scaffolds by using the rotary jet spinning (RJS) technique, and their effects on in vitro properties were evaluated.

A novel technique to produce tubular scaffolds based on collagen and elastin.

Tubular polymer scaffolds based on tissue engineering techniques have been studied as potential alternatives for vascular regeneration implants. The blood vessels of the cardiovascular system are mainly fibrous, composed of collagen (Col) and elastin (El), and its inner layer consists of endothelial cells. In this work, Col and El were combined with polyurethane (PU), a biocompatible synthetic polymer, and rotary jet spinning, a new and highly productive technique, to produce fibrous scaffolds.

Early public research funding response to COVID-19 pandemic in Brazil.

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.

Appraising the potential of Zr-based biomedical alloys to reduce magnetic resonance imaging artifacts.

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).

Solute lean Ti-Nb-Fe alloys: An exploratory study.

In this study, we explored the Ti-Nb-Fe system to find an optimal cost-effective composition with the lowest elastic modulus and the lowest added Nb content. Six Ti-(31-4x)Nb-(1+0.5x)Fe ingots were prepared and Nb was substituted with Fe, starting at Ti-31Nb-1.

Mechanical and microstructural properties of fixation systems used in oral and maxillofacial surgery.

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.

Paired evaluation of calvarial reconstruction with prototyped titanium implants with and without ceramic coating.

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.

Ti-Mo alloys employed as biomaterials: effects of composition and aging heat treatment on microstructure and mechanical behavior.

The correlation between the composition, aging heat treatments, microstructural features and mechanical properties of β Ti alloys is of primary significance because it is the foundation for developing and improving new Ti alloys for orthopedic biomaterials. However, in the case of Ti-Mo alloys, this correlation is not fully described in the literature. Therefore, the purpose of this study was to experimentally investigate the effect of composition and aging heat treatments on the microstructure, Vickers hardness and elastic modulus of Ti-Mo alloys.