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Pagina 1 a partire dal 554 risultati
Long-term deterioration of composite resin and amalgam restorations.
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Previous long-term longitudinal studies of two different methods of placing an auto-cured conventional anterior composite resin, and of a low- and a high-copper amalgam alloy, had shown similar restoration survivals despite the different resin treatment methods used or the types of amalgam alloy
The effect of resin/crosslinker ratio on the mechanical properties and fungal deterioration of a maxillofacial silicone elastomer.
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Variation of the crosslinker/resin ratio of a room temperature condensation cure maxillofacial silicone elastomer has caused considerable changes in the mechanical properties and deterioration by Candida albicans. Increasing the crosslinker/resin ratio caused a decrease in the tensile strength and
Bacterial and fungal deterioration of the Milan Cathedral marble treated with protective synthetic resins.
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Surfaces are continuously exposed to physical, chemical and biological degradation. Among the biological agents that cause deterioration, microorganisms are of critical importance. This work is part of a research programme for the characterisation of the alterations of the Milan Cathedral (Italy).
Deterioration of mechanical properties of composite resins.
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The deterioration of the mechanical properties of composite resins was examined. The bending strength and the stress relaxation rate for sixteen experimental composite resins with different filler shapes, particle sizes and filler contents immersed in distilled water for 0-60 days were measured. The
Is Deterioration of Surface Properties of Resin Composites Affected by Filler Size?
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Materials and Methods
Seven model resinApplication of central composite design to reveal resin deterioration during the removal of hexavalent chromium from wastewater.
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As a strong oxidant, aqueous Cr(VI) possibly oxidizes the polymer resin and weakens resin adsorption property during Cr(VI) removal from solutions by ion exchange. In the present study, to minimize the resin oxidation, central composite design approach based on response surface methodology was
Long term water storage deteriorates bonding of composite resin to alumina and zirconia short communication.
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Objective of this study was to evaluate the effects of long term water storage and ageing on the bond strength of resin composite cement to yttria-stabilized zirconium dioxide (zirconia) and dialuminium trioxide (alumina). Substrate specimens of alumina and zirconia were air particle abraded with
The adhesion mechanism of dental adhesive resin to the alloy. Experimental evidence of the deterioration of bonding ability due to adsorbed water on the oxide layer.
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COPPER BALANCE STUDIES IN WILSON'S DISEASE (HEPATOLENTICULAR DEGENERATION). OBSERVATIONS ON THE EFFECT OF PENICILLAMINE, CARBO-RESIN AND POTASSIUM SULFIDE.
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Bond durability of the resin-bonded and silane treated ceramic surface.
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OBJECTIVE
The aim of this study was to explore methods for improving the ceramic-silane-resin bond strength of silica-based ceramics, such that it may be possible to eliminate the hazardous process of acid etching these dental ceramics with hydrofluoric acid (HF).
METHODS
Ni/Cr rods were prepared
A systematic approach to standardize artificial aging of resin composite cements.
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OBJECTIVE
The aim of the investigation was to contribute to the ongoing discussion at the international standardization committee on how to artificially age dental resin composite cements.
METHODS
Indirect tensile strength (n=30) of a dual-cured resin composite cement (Panavia F2.0) was measured to
Resin composites: Modulus of elasticity and marginal quality.
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OBJECTIVE
To investigate how the modulus of elasticity of resin composites influences marginal quality in restorations submitted to thermocyclic and mechanical loading.
METHODS
Charisma, Filtek Supreme XTE and Grandio were selected as they were found to possess different moduli of elasticity but
Androecia in two Clusia species: development, structure and resin secretion.
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Clusia fluminensis and C. lanceolata are dioecious shrubs having resiniferous flowers with strongly distinct androecia. The aim of this study was to investigate the development and anatomy of their androecia and the ultrastructure, histochemistry and secretory process of their androecium resin
A comprehensive evaluation of the toxicology of cigarette ingredients: essential oils and resins.
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BACKGROUND
A total of 32 essential oils and resins were added individually to experimental cigarettes.
OBJECTIVE
A battery of tests was used to compare the toxicity of mainstream smoke from these experimental cigarettes. The lowest target inclusion level was 100 ppm and the highest was 100,000
Surface Characterization, Antimicrobial Activity, and Biocompatibility of Autopolymerizing Acrylic Resins Coated with Reynoutria elliptica Extract
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We conducted surface characterization to assess the biocompatibility and investigate the antimicrobial activity against oral pathogens in autopolymerizing acrylic resins, coated with light-curable coating resin, containing various concentrations of Reynoutria elliptica extract (0, 200, 400,
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