Effects of In and Zn on properties of low noble metal alloys.
Identifieur interne : 005338 ( Main/Exploration ); précédent : 005337; suivant : 005339Effects of In and Zn on properties of low noble metal alloys.
Auteurs : RBID : pubmed:2009339English descriptors
- KwdEn :
- MESH :
- chemical , toxicity : Indium, Zinc.
- chemical : Alloys, Dental Materials.
- Cells, Cultured, Materials Testing, Microscopy, Electron, Scanning, Tensile Strength, X-Ray Diffraction.
Abstract
Four low noble metal alloys with high In and Zn contents were investigated with regard to porosity in castings, structure, tarnish, hardening mechanism and cytotoxicity. Fumes were observed above the melt, due to the high Zn content and low boiling point of this metal. This Zn evaporation during melting created a small amount of porosity in the castings. This porosity diminished when the Zn content was reduced from 4 to 2%. Scanning electronmicroscopy, microprobe analyses and X-ray diffraction analyses revealed a face-centred cubic (fcc) matrix enriched in Au and Ag and a body-centred cubic (bcc) phase enriched in Pd, In and Zn which had a yellow gold-like appearance. After immersion in a 2% Na2S solution for 72 h, no tarnish attack was observed on the PdlnZn-rich phase. The matrix phase was found to be slightly tarnished. The alloys remained yellow by visual inspection. The agar overlay technique displayed a very slight cytotoxic effect of a sandblasted specimen and no cytotoxic effect of a polished specimen.
PubMed: 2009339
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Fumes were observed above the melt, due to the high Zn content and low boiling point of this metal. This Zn evaporation during melting created a small amount of porosity in the castings. This porosity diminished when the Zn content was reduced from 4 to 2%. Scanning electronmicroscopy, microprobe analyses and X-ray diffraction analyses revealed a face-centred cubic (fcc) matrix enriched in Au and Ag and a body-centred cubic (bcc) phase enriched in Pd, In and Zn which had a yellow gold-like appearance. After immersion in a 2% Na2S solution for 72 h, no tarnish attack was observed on the PdlnZn-rich phase. The matrix phase was found to be slightly tarnished. The alloys remained yellow by visual inspection. The agar overlay technique displayed a very slight cytotoxic effect of a sandblasted specimen and no cytotoxic effect of a polished specimen.</div></front></TEI><pubmed><MedlineCitation Owner="NLM" Status="MEDLINE"><PMID Version="1">2009339</PMID><DateCreated><Year>1991</Year><Month>05</Month><Day>03</Day></DateCreated><DateCompleted><Year>1991</Year><Month>05</Month><Day>03</Day></DateCompleted><DateRevised><Year>2013</Year><Month>11</Month><Day>21</Day></DateRevised><Article PubModel="Print"><Journal><ISSN IssnType="Print">0142-9612</ISSN><JournalIssue CitedMedium="Print"><Volume>12</Volume><Issue>1</Issue><PubDate><Year>1991</Year><Month>Jan</Month></PubDate></JournalIssue><Title>Biomaterials</Title><ISOAbbreviation>Biomaterials</ISOAbbreviation></Journal><ArticleTitle>Effects of In and Zn on properties of low noble metal alloys.</ArticleTitle><Pagination><MedlinePgn>17-21</MedlinePgn></Pagination><Abstract><AbstractText>Four low noble metal alloys with high In and Zn contents were investigated with regard to porosity in castings, structure, tarnish, hardening mechanism and cytotoxicity. Fumes were observed above the melt, due to the high Zn content and low boiling point of this metal. This Zn evaporation during melting created a small amount of porosity in the castings. This porosity diminished when the Zn content was reduced from 4 to 2%. Scanning electronmicroscopy, microprobe analyses and X-ray diffraction analyses revealed a face-centred cubic (fcc) matrix enriched in Au and Ag and a body-centred cubic (bcc) phase enriched in Pd, In and Zn which had a yellow gold-like appearance. After immersion in a 2% Na2S solution for 72 h, no tarnish attack was observed on the PdlnZn-rich phase. The matrix phase was found to be slightly tarnished. The alloys remained yellow by visual inspection. The agar overlay technique displayed a very slight cytotoxic effect of a sandblasted specimen and no cytotoxic effect of a polished specimen.</AbstractText></Abstract><AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Jørgensen</LastName><ForeName>R B</ForeName><Initials>RB</Initials><Affiliation>NIOM, Scandinavian Institute of Dental Materials, Haslum, Norway.</Affiliation></Author><Author ValidYN="Y"><LastName>Herø</LastName><ForeName>H</ForeName><Initials>H</Initials></Author><Author ValidYN="Y"><LastName>Kullmann</LastName><ForeName>A</ForeName><Initials>A</Initials></Author></AuthorList><Language>eng</Language><PublicationTypeList><PublicationType>Journal Article</PublicationType></PublicationTypeList></Article><MedlineJournalInfo><Country>ENGLAND</Country><MedlineTA>Biomaterials</MedlineTA><NlmUniqueID>8100316</NlmUniqueID><ISSNLinking>0142-9612</ISSNLinking></MedlineJournalInfo><ChemicalList><Chemical><RegistryNumber>0</RegistryNumber><NameOfSubstance>Alloys</NameOfSubstance></Chemical><Chemical><RegistryNumber>0</RegistryNumber><NameOfSubstance>Dental Materials</NameOfSubstance></Chemical><Chemical><RegistryNumber>045A6V3VFX</RegistryNumber><NameOfSubstance>Indium</NameOfSubstance></Chemical><Chemical><RegistryNumber>J41CSQ7QDS</RegistryNumber><NameOfSubstance>Zinc</NameOfSubstance></Chemical></ChemicalList><CitationSubset>IM</CitationSubset><MeshHeadingList><MeshHeading><DescriptorName MajorTopicYN="Y">Alloys</DescriptorName></MeshHeading><MeshHeading><DescriptorName MajorTopicYN="N">Cells, Cultured</DescriptorName></MeshHeading><MeshHeading><DescriptorName MajorTopicYN="Y">Dental Materials</DescriptorName></MeshHeading><MeshHeading><DescriptorName MajorTopicYN="Y">Indium</DescriptorName><QualifierName MajorTopicYN="N">toxicity</QualifierName></MeshHeading><MeshHeading><DescriptorName MajorTopicYN="Y">Materials Testing</DescriptorName></MeshHeading><MeshHeading><DescriptorName MajorTopicYN="N">Microscopy, Electron, Scanning</DescriptorName></MeshHeading><MeshHeading><DescriptorName MajorTopicYN="N">Tensile Strength</DescriptorName></MeshHeading><MeshHeading><DescriptorName MajorTopicYN="N">X-Ray Diffraction</DescriptorName></MeshHeading><MeshHeading><DescriptorName MajorTopicYN="Y">Zinc</DescriptorName><QualifierName MajorTopicYN="N">toxicity</QualifierName></MeshHeading></MeshHeadingList></MedlineCitation><PubmedData><History><PubMedPubDate PubStatus="pubmed"><Year>1991</Year><Month>1</Month><Day>1</Day></PubMedPubDate><PubMedPubDate PubStatus="medline"><Year>1991</Year><Month>1</Month><Day>1</Day><Hour>0</Hour><Minute>1</Minute></PubMedPubDate><PubMedPubDate PubStatus="entrez"><Year>1991</Year><Month>1</Month><Day>1</Day><Hour>0</Hour><Minute>0</Minute></PubMedPubDate></History><PublicationStatus>ppublish</PublicationStatus><ArticleIdList><ArticleId IdType="pubmed">2009339</ArticleId></ArticleIdList></PubmedData></pubmed></record>Pour manipuler ce document sous Unix (Dilib)
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