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Dynamic hardness of wood - measurements with an automated portable hardness tester
(Walter De Gruyter Gmbh, 2017-05-01)
A research group on forest products from School of Agriculture - Sao Paulo State University. Brazil developed a portable hardness tester for wood, which is based on a displacement transducer and an embedded electronic ...
Effect of particle hardness on mild–severe wear transition of hard second phase materials
This study analyzes the effect of particle hardness on the transition from mild to severe abrasive wear. White cast iron with 1.9 wt% Cr with austenitic and martensitic matrices, white cast iron with 13.8 wt% Cr and 24.4 ...
Influência do escoamento estático (CREEP) na dureza do amálgama. Efeito de ligas e regióes de medida.
(1990-05-01)
The authors studied the CREEP of 5 amalgam alloys (1 conventional and 4 with high cooper) by the application os static load of 36 MPa in 478 mm specimens, 7 days old. After CREEP test, the samples were included in acrylic ...
Effect of storage in artificial saliva and thermal cycling on Knoop hardness of resin denture teeth
(2010-07-01)
Purpose: This study aimed to evaluate the effect of different storage periods in artificial saliva and thermal cycling on Knoop hardness of 8 commercial brands of resin denture teeth. Methods: Eigth different brands of ...
Hardness evaluation of prosthetic silicones containing opacifiers following chemical disinfection and accelerated aging
(2010-07-01)
We evaluated the effects of disinfection and aging on the hardness of silicones containing opacifiers and intended for use in facial prosthetics. A total of 90 samples were produced using a cylindrical metal mold 3 mm in ...
Comparison of Methods for Evaluating Mineral Loss: Hardness versus Synchrotron Microcomputed Tomography
(Karger, 2009-01-01)
This study analyzed degrees of demineralization in bovine enamel using synchrotron microcomputed tomography (SMCT) and hardness measurements (Knoop hardness number, KHN). For 5 days, 40 bovine enamel blocks were individually ...
Effect of repeated cycles of chemical disinfection on the roughness and hardness of hard reline acrylic resins
(WILEY-BLACKWELL, 2010)
Objective: The aim of this study was to assess the effect of repeated cycles of five chemical disinfectant solutions on the roughness and hardness of three hard chairside reliners. Methods: A total of 180 circular specimens ...
Effect of disinfection treatments on the hardness of soft denture liner materials
(2007-03-01)
Purpose: To evaluate the effects of disinfection treatments with chemical solutions (2% glutaraldehyde, 5% sodium hypochlorite, and 5% chlorhexidine) and microwave energy on the hardness of four long-term soft denture ...
Effect of Beverages and Mouthwashes on the Hardness of Polymers Used in Intraoral Prostheses
(Wiley-Blackwell, 2014-10-01)
PurposeThe mechanical properties of acrylic resins used in intraoral prostheses may be altered by frequent exposure to liquids such as beverages and mouthwashes. This study aimed to evaluate the effect of thermocycling and ...