mo40 low-alloy steels are mostly used to produce industrial components such as crane wheels whichare exposed to abrasive wear. however, during working conditions, their wear resistance is reduced aftera while due to its low hardness. with increasing abrasive wear, the dimensions of components decreaseand they need to be repaired for surface modification. in this regard, hard overlay coatings ar...

STATEMENT OF PROBLEM Colored zirconia is widely used in dental clinical practice; however, data pertaining to its wear resistance after different surface treatments are sparse. PURPOSE The purpose of this in vitro study was to evaluate the 2-body wear resistance of dental colored zirconia after different glazing and polishing treatments. MATERIAL AND METHODS Standardized specimens were prep...

background: the interim restorative materials should have certain mechanical properties to withstand in oral cavity. the aim of this study was to evaluate the hardness and wear resistance ofinterim restorative materials. materials and methods: fifteen identical rectangular shape specimens with dimensions of 2 mm × 10 mm × 30 mm were made from 7 interim materials (tempspan, protemp 3 garant, rev...

This review of human tooth wear describes the fundamental mechanisms underlying this process. Using the tribological approach they can be systematised and this in turn aids our understanding of them. In past populations wear was ubiquitous, intense, abrasive and physiological as it was related to their food and their technologies. In these populations, it affected the proximal surfaces, and the...

The purpose of this paper is to investigate the chemical composition, the polymerization ability and the abrasion resistance of two brands (Isosit, Plastique) of thermo-setting resin for crown and bridge. 1. Isosit (Is) contained approximately 55 per cent of MFR type filler and 45 per cent of a comonomer (urethane dimethacrylate, 1, 3 butane dimethacrylate and 1, 10 decamethylene dimethacrylate...

Introduction: Low resistance of composite resins to abrasion is a primary concern in the application of these materials for posterior restorations which are prone to high occlusal loads. This study compared the wear resistance of three types of composites. Methods: In this laboratory experiment, five specimens of each of the three types of composites (z250, Heliomolar, Opallis) were prepared...

I. Pernis, J. Kasala, Alexander Dubček University of Trenčin, Faculty of Special Technology, Trenčin, Slovakia, D. Žabecká, Technical university of Košice, Faculty of Metallurgy, Košice, Slovakia The paper deals with the tribological properties of investigated types of hardfacing materials at erosive wear process. Infl uence of impact angle of abrasive grains on wear resistance and microhardnes...

Diamond turning of steel alloys is impractical due to catastrophic tool wear caused by a combination of chemical and abrasive wear. In the literature, several modifications of the cutting process have been proposed, e.g. cutting in an inert gas atmosphere, cryogenic cutting and vibration assisted cutting, e.g. elliptical vibration cutting (EVC) [1-5]. In this work, the EVC method was investigat...

OBJECTIVES This study determined the two-body wear and toothbrushing wear parameters, including gloss and roughness measurements and additionally Martens hardness, of nine aesthetic CAD/CAM materials, one direct resin-based nanocomposite plus that of human enamel as a control group. MATERIALS AND METHODS Two-body wear was investigated in a computer-controlled chewing simulator (1.2 million lo...

AIM This study evaluated the efficacy of self-etching adhesive systems associated or not associated with the neodymium-doped yttrium aluminum garnet (Nd:YAG) laser on the protection against enamel erosive/abrasive wear. MATERIALS AND METHODS Bovine enamel specimens were demineralized with 0.3% citric acid (5 minutes). The samples were randomly assigned to eight groups (n = 20): SB - Single Bo...