Mechanical and Surface Characteristics of Selective Laser Melting-Manufactured Dental Prostheses in Different Processing Stages.

Due to the expansion of the use of powder bed fusion metal additive technologies in the medical field, especially for the realization of dental prostheses, in this paper, the authors propose a comparative experimental study of the mechanical characteristics and the state of their microscale surfaces. The comparison was made from material considerations starting from two dental alloys commonly used to realize dental prostheses: Ni-Cr and Co-Cr, but also technologies for obtaining selective laser melting (SLM) and conventional casting. In addition, to compare the performances with the classical casting technology, for the dental prostheses obtained through SLM, the post-processing stage in which they are in a preliminary finishing and polished state was considered.

The Effect of Ca and Mg on the Microstructure and Tribological Properties of YPbSn10 Antifriction Alloy.

An alloy YPbSn10 used for antifriction applications was synthetized in a furnace and the structure was improved by a microalloying technique. The elements chosen for microalloying were Ca 2%wt and Mg 2%wt. The microalloying technique proved to have good results in producing alloys with homogeneous composition, with a good distribution of the hard phase.

Neurobehavioral and biochemical response to manganese and selenium exposure in rats.

Aiming to extend previous findings, male Wistar rats were treated per os for 13 weeks with manganese chloride in two doses: 300 mg/kg body weight (group I) and 20 mg/kg b.w. (II), the former was associated (III) with a microdose (1 ppm) of natrium selenite.

Central and peripheral effects of 6-hydroxydopamine on exercise performance in rats.

6-Hydroxydopamine (6-OHDA) injected into the lateral cerebral ventricles of rats impaired their exercise performance until exhaustion (treadmill run and swimming). The injected rats displayed significantly less training-induced improvement of swimming performance than did the control animals. Reduced performance also was seen in adult rats treated intraperitoneally with 6-OHDA in the neonatal or adult periods.