Chinese compilation of precious metal alloy phase diagrams

1981 ◽  
Vol 2 (1) ◽  
pp. 26-26
Keyword(s):  
Phase Diagrams ◽  
Precious Metal ◽  
Metal Alloy

Alloy Chemical Comparison of the Refractory Metal - Noble Metal Phase Diagrams T5-T10 (T5 = V, Nb, Ta; T10 = Pd, Pt)

1982 ◽  
Vol 19 ◽  
Author(s):  
R. Waterstrat ◽  
B.C. Giessen
Keyword(s):  
Phase Diagrams ◽  
Noble Metal ◽  
Refractory Metal ◽  
Metal Alloy ◽  
Metal Phase

ABSTRACTThe six T5-Tl0 metal alloy phase diagrams containing Pd or Pt have now all been established. The alloy phases occurring in these systems are tabulated and reviewed here with respect to their structures.

Effect of Metal Surface Treatment on the Masking Power of Opaque Porcelain

1972 ◽  
Vol 51 (2) ◽  
pp. 468-472 ◽  
Author(s):  
Thomas W. Herzberg ◽  
Lawrence Gettleman ◽  
Richard L. Webber ◽  
Joseph P. Moffa
Keyword(s):  
Surface Treatment ◽  
Metal Surface ◽  
Spectral Reflectance ◽  
Precious Metal ◽  
Metal Alloy ◽  
Logarithmic Model

Spectral reflectance was determined as a function of incremental thickness of opaque porcelain applied to precious metal alloy surfaces treated in three ways. Sandblasted and fine-ground surfaces required comparable thicknesses of porcelain to achieve the same degree of opacity at selected wavelengths, whereas specimens conditioned with a gold flashing agent required 40 to 60% less opaque porcelain to achieve the same result. A logarithmic model for predicting reflectance as a function of porcelain thickness was applicable for gold-flashed surfaces at wavelengths greater than 550 nm.

scholarly journals Adhesion of Heat-curing Resin to Precious Metal Alloy Denture. Surface Modification Method and Adhesive Ability.

1997 ◽  
Vol 41 (3) ◽  
pp. 357-362 ◽  
Author(s):  
Yoji Konishi ◽  
Hiroki Ohno ◽  
Toshihiro Hirai ◽  
Hisashi Koshino ◽  
Tsutomu Ishijima ◽  
...  
Keyword(s):  
Surface Modification ◽  
Precious Metal ◽  
Metal Alloy ◽  
Heat Curing ◽  
Modification Method ◽  
Adhesive Ability

Interactions of Modern Aesthetic Materials for Prosthetic Restorations with Oral Mucosa A pilot study

2018 ◽  
Vol 69 (2) ◽  
pp. 386-390
Author(s):  
Bogdan Calenic ◽  
Mihaela Pantea ◽  
Ana Maria Cristina Tancu ◽  
Paula Perlea ◽  
Maria Greabu ◽  
...  
Keyword(s):  
Epithelial Cell ◽  
Cell Line ◽  
Polymethyl Methacrylate ◽  
Oral Mucosa ◽  
Precious Metal ◽  
Metal Alloy ◽  
Health Science ◽  
Epithelial Cell Line ◽  
Gingival Epithelial Cell ◽  
E Cadherin

The specific objective of the present study is to assess the interactions between cells from a human gingival epithelial cell line and various aesthetic materials used in modern prosthetic dentistry. For this study six types of dental materials were selected: Cr-Co non-precious metal alloy, ceramics applied on Cr-Co non-precious metal alloy, zirconia, ceramics applied on zirconia, polymethyl methacrylate and pressed ceramics/lithium disilicate. Cells from a human gingival epithelial cell line, Ca9-22 (Health Science Research Resources Bank), were cultured on the chosen surfaces for 3, 5 and 7 days. Cellular proliferation, cell attachment (using Multiplex Arrays Technology) and cytotoxicity (MTT- Assay) were evaluated at distinct predetermined intervals. Measurements performed at each distinct predetermined interval showed no significant difference for cell proliferation and cytotoxicity between the selected surfaces, however the highest levels were registered for the polymethyl methacrylate surface. Different attachment patterns were observed for epithelial cells attached on substrates, such as significantly different levels of adherence of E-Cadherin and N-Cadherin molecules; E-Cadherin adhesion levels indicate that pressed ceramics may be the dental material which, compared to the selected materials, influences the least the homeostasis of oral mucosa.

scholarly journals Multi-Technique Approach to Understanding Phase Transformations in a Precious Metal Alloy

2008 ◽  
Vol 14 (S2) ◽  
pp. 1078-1079 ◽  
Author(s):  
DF Susan ◽  
JR Michael ◽  
JT Bond ◽  
RG Stone ◽  
JM Rodelas
Keyword(s):  
New Mexico ◽  
Phase Transformations ◽  
Precious Metal ◽  
Metal Alloy

Extended abstract of a paper presented at Microscopy and Microanalysis 2008 in Albuquerque, New Mexico, USA, August 3 – August 7, 2008

scholarly journals Desarrollo de un revestimiento de chamota/yeso para microfundición de joyería con esmeraldas preengastadas

2017 ◽  
Vol 26 (45) ◽  
Author(s):  
Carlina Sofía Londoño-Montes ◽  
Mayerly Jhojana Fernández-Torres ◽  
Elcy María Córdoba-Tuta
Keyword(s):  
Precious Metal ◽  
Casting Process ◽  
Thermal Characterization ◽  
Metal Alloy ◽  
Experimental Methodology ◽  
Ceramic Mold ◽  
Casting Technique ◽  
The Face ◽  
Mechanical And Microstructural Properties

During the jewelry stone-in-place micro-casting process, the ceramic mold, which is composed of silica and plaster is stabilized at temperatures close to 650 °C, whereas the casting temperature of the precious metal alloy hovers around 1000 °C. Therefore, this type of micro-casting technique is not suitable for gems such as emeralds, since they are highly susceptible to damage at temperatures over 350 °C. In the face of this fact, the main purpose of the present work is to develop a refractory mold based on chamotte and plaster, which can be stabilized at low temperatures, in order to use it for the micro-casting of pre-set emeralds. To achieve this, the experimental methodology was divided into three phases: i) raw chemical materials, mineralogical, granulometric and thermal characterization; ii) preparation and characterization of chamotte-plaster-water mixtures, including the measurement of casting times, mechanical and microstructural properties, permeability, and resistance to thermal shock; and iii) evaluation of the resulting refractory mold in the micro-casting of pre-set emeralds. The results showed that the refractory mold with composition chamotte/plaster 75/25, an addition of 50 % of water to the dried mixture, and fine granulometry (-200 mesh) had a stabilization temperature of 350 °C. Furthermore, it is possible to subject the emeralds to the stone-in-place micro-casting process that employs the refractory mold developed here, with a thermal treatment that does not surpass the 350 °C, along with a low melting point (398 °C) for the precious metal alloy.

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