The present study explored wear and biocompatibility characteristics of polypropylene (PP)/ periwinkle shell particulates (PWS) composites for dental implant application. Wet-sliding the stainless steel ball against specimen disc revealed abrasive behaviour under load linear speed 5 N 10 cm/s respectively. In tests, specimens were wetted with simulated human saliva without sodium fluoride (NaF)...

A hybrid finite-discrete element method (FDEM) is proposed to model rock fracture initiation and propagation during a three-point bending test under quasistatic dynamic loading conditions. Three models have been implemented in the FDEM transition from continuum discontinuum through fragmentation. The rate effect on behaviour has taken into account by implementation of relationship between stati...

The present study examined the ultrastructural features of the articular discs of the temporomandibular joint (TMJ) of nine human fetuses aging from 21 to 28 weeks. The specimen of the fetal articular discs was sectioned frontally and sagitally and examined under the scanning electron-microscope. The ultrastructural survey of the architecture of the articular disc revealed three bands composed ...

PURPOSE The present study was undertaken to detect metallo-beta-lactamase (MBL) in nosocomial isolates of Pseudomonas aeruginosa by four different phenotypic methods. METHODS Ninety-one consecutive P. aeruginosa isolates were subjected to susceptibility testing by disc-diffusion assay and Vitek 2. Imipenem resistance was determined by three different methods (disc-diffusion, Vitek 2 and E tes...

The brittleness of rock is known to be an important property that affects the fragmentation characteristics in mechanized cutting. As interaction between cutting tool and (i.e., cutter forces, efficiency, s/p ratio, abrasivity) during mechanical strongly influenced by fragmentation, tools disc pick cutter) experience different behaviors depending on brittleness. In this study, relationships abr...

In the search for alternatives to obtain more information from rock tests and make them accessible, this study applies Digital Image Correlation technique (DIC 2D) in a diametral compression test called Brazilian Test, comparing result measured by an extensometer with obtained DIC. Rock provide about characteristics applicable several engineering areas, such as mining construction. using strain...

One new species of Thalassomya Schiner, 1856 (Diptera: Chironomidae: Telmatogetoninae), T. gutae sp. n. is described and figured as male, pupa and larva. The specimen was collected in the marine zone between tidemarks, in southeastern Brazilian coast and is the first species of this genus recorded to Brazil.

The tensile strength of rocks plays a noteworthy role in their failure mechanism, and its determination can be beneficial in optimizing the design of the rock structures. Schistose rocks due to their inherent anisotropy in different foliation directions show a diverse strength at each direction. The purpose of this work was to compare and assess the tensile strength of phyllite, which was obtai...

New methods are needed that can predict the clinical failure of dental restorations that primarily rely on dentin bonding. Existing methods have shortcomings, e.g. severe deviation in the actual stress distribution from theory and a large standard deviation in the measured bond strength. We introduce here a novel test specimen by examining an endodontic model for dentin bonding. Specifically, w...

STATEMENT OF PROBLEM As a physical property, wear resistance of the materials used in the fabrication of orthodontic retainers play a significant role in the stability and long term use of the appliances. OBJECTIVES To evaluate the wear resistance of two commonly used materials for orthodontic retainers: Acropars OP, i.e. a polymethyl methacrylate based material, and 3A-GS060, i.e. a polyethy...