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Effects of annealing and annealing cooling media in corrosion resistance and microhardness of low content Chromium Nickel steel
Corrosion Resistance Microhardness
2010/9/26
To study the effect of intermediate spheroidal annealing on some properties of a metal, samples of chromium-nickel steal were chosen. The samples were carburized, normalized, annealed, hardened and te...
Effect of sodium hypochlorite contamination on microhardness of dental core build-up materials
Composite Degradation Microhardness
2010/11/29
This study aimed to determine the influence of sodium hypochlorite (NaOCl) contamination on the microhardness of build-up composites. Fifty-two samples, from each of three build-up materials (LuxaCore...
Peroxide bleaching agent effects on enamel surface microhardness, roughness and morphology
Tooth bleaching Peroxides Dental enamel
2009/10/20
The aim of this study was to evaluate the surface roughness, microhardness and morphology of human enamel exposed to six bleaching agents (at baseline and post-treatment). Human dental enamel samples ...
Effect of light curing tip distance and resin shade on microhardness of a hybrid resin composite
Composite resins Hardness
2009/10/20
Resin composite shades and resin composite polymerization performed with a distanced light tip are factors that can affect polymerization effectiveness. Thisin vitro study aimed to evaluate the influe...
Microhardness of Ni-Cr alloys under different casting conditions
Metal ceramic alloys Dental casting technique Hardness tests
2009/10/19
This study evaluated the microhardness of Ni-Cr alloys used in fixed prosthodontics after casting under different conditions. The casting conditions were: (1-flame/air torch) flame made of a gas/oxyge...
Effect of thickener agents on dental enamel microhardness submitted to at-home bleaching
Dental enamel Hardness tests Tooth bleaching Thickeners [adverse effects]
2009/10/19
Dental bleaching occurs due to an oxidation reaction between the bleaching agents and the macromolecules of pigments in the teeth. This reaction is unspecific and the peroxides can also affect the den...
Microhardness assessment of different commercial brands of resin composites with different degrees of translucence
Composite resins Hardness Color
2009/10/16
Owing to improvements in its mechanical properties and to the availability of shade and translucence resources, resin composite has become one of the most widely used restorative materials in present ...
Evaluation of superficial microhardness in dental enamel with different eruptive ages
Dental enamel Hardness Tooth eruption Tooth unerupted
2009/10/16
This study evaluated the superficial microhardness of enamel in teeth at different posteruptive ages (before eruption in the oral cavity, 2-3 years after eruption, 4-10 years after eruption and more t...
Microhardness Evaluation of Resin Composites Polymerized by Three Different Light Sources
Microhardness Resin composite Light curing unit
2009/9/14
This study examined the surface microhardness of four kinds of resin composites with different fillers and resin matrices. Ten specimens of 2 mm thickness and 4 mm diameter of each resin composite wer...
Effects of LEDs on Microhardness and Temperature Rise of Dental Composite Resins
LEDs Composite resins Microhardness
2009/9/14
The purpose of this study was to examine the effects of LEDs on the polymerization of dental composite resins. Three composite resins and two LED units were used to evaluate the latter's effects on mi...
Corrosion-related Changes on Ti-based Orthodontic Brackets in Acetic NaF Solutions: Surface Morphology, Microhardness, and Element Release
Corrosion Bracket NaF solution
2009/9/11
This study sought to investigate the effects of acetic NaF solutions on titanium and Ti alloy brackets. To this end, two different brackets were immersed in various NaF-containing solutions for three ...
The effect of resin shades on microhardness,polymerization shrinkage, and color change of dental composite resins
Resin shade Polymerization shrinkage Color change
2009/9/11
The present study sought to evaluate the effect of resin shades on the degree of the polymerization. To this end, response variables affected by the degree of polymerization were examined in this stud...
Examination of composite resins with electron microscopy,microhardness tester and energy dispersive X-ray microanalyzer
Ultrastructure Microhardness X-ray microanalysis
2009/9/11
This study was conducted to examine the ultrastructures of eight recently improved light-cure restorative composite resins with scanning and transmission electron microscopes (SEM and TEM). Additional...
Macro- and microhardness of IN-713C nickel superalloy constituents
Nickel superalloys Cooling rate Modification Microanalysis Hardness
2011/4/1
The results of investigations of the effect of modification and cooling rate on the macrohardness of castings and microhardness of phase constituents in IN-713C nickel superalloy were described. As a...
Microhardness and tribological wear of the steels remelted with an electric arc
steel remelting of a surface layer hardness tribological wear GTAW method
2011/3/30
This study presents results of a research on the surface strengthening of the C15, C45 and C90U steels by application of concentrated heat stream with the GTAW methodology. Utilizing the GTAW methodol...