Measurement of Oxide Adherence to PFM Alloys

Mackert, J. Rodway; Parry, Edward E.; Hashinger, D.T.; Fairhurst, Carl W.

doi:10.1177/00220345840630111701

Cited by 44 publications

(34 citation statements)

References 17 publications

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“…Therefore, one of the challenges in this type of alloys is controlling the excessive formation of chromium oxide that results in lower bond strength between metal and porcelain [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Influence of preoxidation cycle on the bond strength of CoCrMoSi–porcelain dental composites

Henriques

Soares

Silva

2012

Materials Science and Engineering: C

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Section: Introductionmentioning

confidence: 99%

Influence of preoxidation cycle on the bond strength of CoCrMoSi–porcelain dental composites

Henriques

Soares

Silva

2012

Materials Science and Engineering: C

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“…Međugrupna razlika sastava metal-keramičkog međuspoja je značajna posle prvog livenja i šestog recikliranja legure (p<0.001; p<0.002; ttest nezavisni uzorak). DISKUSIJA Istraživanja na bazičnim legurama su najčešće bila usmerena na određivanje sastava oksida na površini legure (11)(12)(13)(14)(15)(16)(17). Autori ovih istraživanja su pokazali da se oksidni sloj na površini bazičnih legura predominantno sastoji od hrom-oksida (Cr2O3) i nikl-oksida (NiO).…”

Section: Wwwtmgorgrsunclassified

“…Našao je i značajnu korespodenciju između adherencije oksida za metal i kvaliteta metal-keramičke veze (11). Pokazano je da je izostanak kiseonikaktivnih elemenata iz legure odgovoran za slabu adherenciju oksida [13].…”

Section: Wwwtmgorgrsunclassified

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Energy-dispersive x-ray spectrophotometry(EDX) analysis of metalceramic bonds in cobalt-chromium alloys for the fabrication of fix dental restorations

Stefanović¹,

Taso²,

Mirković³

2017

Tim Med Glas

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(1) VOJNOMEDICINSKA AKADEMIJA, KLINIKA ZA STOMATOLOGIJU, BEOGRAD, (2) CENTAR VOJNOMEDICINSKIH USTANOVA 11000 BEOGRAD Sažetak:Uvod/cilj. Istraživanje je sprovedeno sa ciljem da se utvrde i kvantifikuju promene sastava metal-keramičkog međuspoja bazičnih dentalnih legura koje su podvrgute postupku višestrukog livenja. Ponovna upotreba dentalnih legura (recikliranje) je dosta česta pojava prilikom izrade fiksnih zubnih nadoknada, a bez obraćanja pažnje na funkcionalnu trajnost gotove krune ili mosta. Kvantitativnom i kvalitativnom analizom metal-keramičkih međuspojeva treba pokazati da li se može opravdati postupak recikliranja legura, odnosno ispitati uticaj ponovljenog livenja legure na hemijski sastav njenog spoja sa keramikom. Metode. Eksperimentalna studija je izvedena na leguri Wirobond-C koja višestruko livena kroz 12 generacija recikliranja. Analizirano je ukupno 24 uzorka -po 6 uzoraka u svakoj grupi (grupa A -prvo livenje, grupa B -treće recikliranje, grupa C -šesto recikliranje i grupa Ddvanaesto recikliranje). EDX analiza je sprovedena u aparatu "Inca X-Sight" (Oxford Instrumensts) uz upotrebu SEM mikroskopa "JEOL" tip "JSM 6460 LV" (Tokio, Japan). EDX analiza pripremljenih uzoraka obavljena je pod sledećim uslovima: frekvencija elektronskog snopa 20.000 impulsa u sekundi, napon snopa 10 KV, vreme akvizicije 250 sekundi, analizirani opseg energije X-zraka 0 do 10 KeV. Kvantitativna EDX analiza metal-keramičkog međuspoja vršena je primenom računarskog programa "INCA" (Oxford Instruments), u odnosu na odgovarajuće metalne i nemetalne standarde. Rezultati. Sve metalne komponente iz legure kako je povećavan broj livenja permanentno su opadale u sastavu metalkeramičkog međuspoja, dok su elementi koji su poreklom iz keramike povećavali svoju zastupljenost. Pojedinačna analiza pokazuje da višestruko livenje legure Wirobond-C u najvećoj meri čini da se smanjuje udeo cerijuma u metal-keramičkom međuspoju. Međugrupna razlika sastava metal-keramičkog međuspoja je značajna posle prvog livenja i šestog recikliranja legure (p<0.001; p<0.002; t-test nezavisni uzorak). Zaključak. Ponovno livenje bazičnih legura kobalt-hrom ne može se preporučiti zbog promene sastava metal-keramičkog međuspoja. Recikliranje ovih legura izaziva značajne promene u metalkeramičkom međuspoju , sa mogućim posledicama u vidu slabljenja međuspoja i oštećenja keramike u toku mastikacije. Ključne reči: Energijska disperziona spektrometrijska(EDX) analiza, Fiksne zubne nadoknade, recikliranje dentalnih legura Summary:Background/Aim. The aim of this research was to determine and quantify changes in the composition of metal-ceramic bond in the base dental alloys submitted to the procedure of multiple casting. Recusing (recycling) of dental alloys is performed very often in the fabrication of fix dental restorations, however, paying no attention to functional durability of the made crown or bridge. Quantitative and qualitative analyses of metal-ceramic bonds should show if recycling of alloys could be justified, that is to estimate the influence of ...

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“…The chemical bonding is maximized when a monomolecular oxide layer remains at the interface. The importance of oxide adherence to its alloy substrate has been emphasized by Mackert [6,7], who found a correlation between oxide adherence and porcelain adherence to metal. The dental noble alloys are normally alloyed by base metals like In, Sn and Ga, which form an oxide layer on the alloy.…”

Section: Introductionmentioning

confidence: 99%

The effect of indium on porcelain bonding between porcelain and Au?Pd?In alloy

Hautaniemi

1995

J Mater Sci: Mater Med

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The effect of small In additions on oxide structure and porcelain adherence to Au-Pd alloys was studied. In was oxidized internally as In203. No uniform external oxide layer could be seen. Small In addition (1 at%) did not have any detectable effect on porcelain adherence (~12 MPa), whereas higher In concentration (5 at%) caused significant increase in bond strength (~,26 MPa). This increase was probably a result of higher In203 concentration at the surface. IntroductionPd-containing alloys have become recognized as alternatives to high-Au and non-precious alloys for metal-ceramic restorations. The main reasons for the popularity of palladium alloys are good corrosion and tarnish resistance along with acceptable biocompatibility and the price of Pd, which is approximately one-half of that for Au. Pd-rich alloys suitable for metal-ceramic restorations can be roughly divided into following groups: Au-Pd-, Pd-Co-, Pd-Cuand Pd-Ag-based alloys [1]. Considering the physical properties, processing characterics and the amount of precious metal components, the Au-Pd-system is very attractive because of the excellent compromise between these three factors [2].The importance of the oxide layer on the bonding of metal to porcelain is generally accepted for all kinds of metal-ceramic materials. The theory of glass/metalbonding was largely developed by Pask [3][4][5]. He postulated that chemical bonding across the interface is achieved by having therodynamically stable equilibrium in the interfacial zone and having both phases saturated with an oxide of the substrate metal. The oxide layer formed on metal by preoxidation is supposed to be dissolved by molten glass. The chemical bonding is maximized when a monomolecular oxide layer remains at the interface. The importance of oxide adherence to its alloy substrate has been emphasized by Mackert [6,7], who found a correlation between oxide adherence and porcelain adherence to metal. The dental noble alloys are normally alloyed by base metals like In, Sn and Ga, which form an oxide layer on the alloy. Accumulation of oxidizing elements within a few micrometres of the metal/porcelain interface has been reported in several studies [8-t3], in which concentration profiles of alloy components over a metal/porcelain interface were measured by electron microprobe. Such data are generally found to support the theory that chemical bonding mechanisms are controlled by oxidizing metal components. More de-

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Measurement of Oxide Adherence to PFM Alloys

Cited by 44 publications

References 17 publications

Influence of preoxidation cycle on the bond strength of CoCrMoSi–porcelain dental composites

Influence of preoxidation cycle on the bond strength of CoCrMoSi–porcelain dental composites

Energy-dispersive x-ray spectrophotometry(EDX) analysis of metalceramic bonds in cobalt-chromium alloys for the fabrication of fix dental restorations

The effect of indium on porcelain bonding between porcelain and Au?Pd?In alloy

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