Microstructural characterization and comparative evaluation of physical, mechanical and biological properties of three ceramics for metal–ceramic restorations

Kontonasaki, Eleana; Kantiranis, Nikolaos; Papadopoulou, Lambrini; Chatzistavrou, Xanthippi; Kavouras, P.; Zorba, T.; Sivropoulou, Afroditi; Chrissafis, K.; Paraskevopoulos, K. M.; Koidis, Petros

doi:10.1016/j.dental.2008.03.002

Cited by 48 publications

(39 citation statements)

References 56 publications

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“…Multiple firings caused either a decrease or an increase in the leucite volume fraction. 19,33 The possible mechanisms of this change are crystallization on the one hand or dissolution on the other. 34 Cristobalite precipitation in the composite takes place during firing, but it can be prevented by the presence of Al ions.…”

Section: Discussionmentioning

confidence: 99%

Effects of multiple firings on the mechanical properties and microstructure of veneering ceramics for zirconia frameworks

Tang¹,

Nakamura²,

Usami³

et al. 2012

Journal of Dentistry

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Section: Discussionmentioning

confidence: 99%

Effects of multiple firings on the mechanical properties and microstructure of veneering ceramics for zirconia frameworks

Tang¹,

Nakamura²,

Usami³

et al. 2012

Journal of Dentistry

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“…For microhardness measurement, disk specimens were measured with a microhardness tester (Micromet II, Buehler Ltd., Lake Bluff, IL, USA) using a Vickers diamond-tipped indenter under a 0.2 N indentation load for 15 seconds 21) . Five indentations per specimen were performed on the top surface, and the mean baseline value of each specimen before immersion was calculated.…”

Section: Titratable Acidity Measurementmentioning

confidence: 99%

Degradability of fluorapatite-leucite ceramics in naturally acidic agents

2010

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This study was conducted to evaluate the titratable acidity and effect of naturally acidic agents on the surface microhardness, elemental composition, and surface morphology of fluorapatite-leucite ceramics. One hundred and ten ceramic disks (IPS d.SIGN), 12.0 mm in diameter and 2.0 mm in thickness, were fabricated. Before immersion, the baseline data of Vickers microhardness and elemental composition were recorded. Four groups were immersed in acidic agents (citrate buffer solution, green mango juice, and pineapple juice) and deionized water (control) at 37ºC for 168 hours, whereas one group was immersed in 4% acetic acid at 80ºC for 168 hours. After immersion, specimens were evaluated and data were analyzed using one-way repeated ANOVA and Tukey's test (α=0.05). Microhardness values significantly decreased after immersion (p<0.05). In terms of elemental composition, the weight percentages of silicon, potassium, aluminum, and sodium also decreased after immersion (p<0.05). Results of this study showed that fluorapatite-leucite ceramics were affected by long-term immersion in acidic agents.

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“…For a valid comparison of the bond strengths between the metal and the ceramic obtained by using two different production methods, it is desirable that each ingredient used in the experiments should be identical,29 including the oxide film formation behavior,30 CTEs,31 etc. To minimize the effect of different composition and to find pure effect of manufacturing methods, materials with the most similar composition were chosen among materials provided (Table 1).…”

Section: Discussionmentioning

confidence: 99%

Bond and fracture strength of metal-ceramic restorations formed by selective laser sintering

Bae

Kim

et al. 2014

J Adv Prosthodont

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PURPOSEThe purpose of this study was to compare the fracture strength of the metal and the bond strength in metal-ceramic restorations produced by selective laser sintering (SLS) and by conventional casting (CAST).MATERIALS AND METHODSNon-precious alloy (StarLoy C, DeguDent, Hanau, Germany) was used in CAST group and metal powder (SP2, EOS GmbH, Munich, Germany) in SLS group. Metal specimens in the form of sheets (25.0 × 3.0 × 0.5 mm) were produced in accordance with ISO 9693:1999 standards (n=30). To measure the bond strength, ceramic was fired on a metal specimen and then three-point bending test was performed. In addition, the metal fracture strength was measured by continuing the application of the load. The values were statistically analyzed by performing independent t-tests (α=.05).RESULTSThe mean bond strength of the SLS group (50.60 MPa) was higher than that of the CAST group (46.29 MPa), but there was no statistically significant difference. The metal fracture strength of the SLS group (1087.2 MPa) was lower than that of the CAST group (2399.1 MPa), and this difference was statistically significant.CONCLUSIONIn conclusion the balling phenomenon and the gap formation of the SLS process may increase the metal-ceramic bond strength.

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Microstructural characterization and comparative evaluation of physical, mechanical and biological properties of three ceramics for metal–ceramic restorations

Cited by 48 publications

References 56 publications

Effects of multiple firings on the mechanical properties and microstructure of veneering ceramics for zirconia frameworks

Effects of multiple firings on the mechanical properties and microstructure of veneering ceramics for zirconia frameworks

Degradability of fluorapatite-leucite ceramics in naturally acidic agents

Bond and fracture strength of metal-ceramic restorations formed by selective laser sintering

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