Stress induced phase transformation of a cesium stabilized leucite porcelain and associated properties

Rasmussen, Stephen T.; Groh, Carole L.; O’Brien, William J.

doi:10.1016/s0109-5641(98)00033-5

Cited by 35 publications

(39 citation statements)

References 12 publications

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“…3. 22 The slope of the linear fit for leucite 400 peak areacopper 111 peak area vs. leucite content is 1.69, which is very close to 1.73 that has been reported by Rasmussen. 22 The variation may be the result of different balance materials Rasmussen used silica glass, however, low temperature frit was adopted in the study in the standards whose absorbance of X-ray is different.…”

Section: 12 19 -21supporting

confidence: 86%

“…Therefore, the selection of pure leucite for the standards is quite important. Some researchers have employed the natural leucite mineral 22 or leucite-containing frits with known leucite content 24 ,25 to prepare the standards. However, the results may be biased due to the impurity of the natural leucite mineral or the changing of leucite content in the frits.…”

Section: 12 19 -21mentioning

confidence: 99%

“…22 The variation may be the result of different balance materials Rasmussen used silica glass, however, low temperature frit was adopted in the study in the standards whose absorbance of X-ray is different. Using quantitative XRD, Rasmussen 22 and Markert 24 measured the fraction of leucite by leucite 211 and 400 peak respectively. In this research, the leucite content was measured by the two calibration curves in Fig.…”

Section: 12 19 -21mentioning

confidence: 99%

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Quantitative XRD Analysis of Hydrothermally-derived Leucite Content in Dental Porcelain Ceramics

Zhang

Liu

Rao

et al. 2007

J. Ceram. Soc. Japan

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In this study, the leucite contents in the sintered porcelain and hydrothermally-derived powders were determined by the quantitative XRD analysis using internal standard. The leucite powders were prepared at 800? C-1200? C. The dental porcelain was sintered at 850? C from the mixture of 20 mass! leucite prepared at 1100? C and 80 mass! low temperature frit. The four standards for quantitative XRD analysis were established by mixing the low temperature frit as a balance material , the copper as an internal standard and different weight content of pure leucite synthesized by molten method. They were X-rayed over the 2u ranges from 14.5? to 17.5? , 26.5? to 28.5? and 42.5? to 44.5? for measuring the integrated area of leucite 211 , 400 peaks and copper 111 peak. The area of leucite 211 and 400 peaks was divided by the area of copper 111 peak respectively and two calibration curves were plotted from these data. Before measuring the leucite content in the synthetic leucite, 40 mass! synthetic leucite was mixed with 60 mass! frit, whereas the leucite content in the sintered porcelain was determined by the method directly. The result of quantitative XRD analysis showed that the leucite content in the synthesized powders and dental porcelain correlated very well with the treating temperature and image analysis of SEM picture. The standards set in the study may be useful for measuring the leucite content in other systems.

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Section: 12 19 -21supporting

confidence: 86%

Section: 12 19 -21mentioning

confidence: 99%

Section: 12 19 -21mentioning

confidence: 99%

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Quantitative XRD Analysis of Hydrothermally-derived Leucite Content in Dental Porcelain Ceramics

Zhang

Liu

Rao

et al. 2007

J. Ceram. Soc. Japan

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“…As for the leucite crystals (less than 3 µm in diameter of flower-like morphology) also present in IPS d.SIGN ceramic, they contribute to the overall strength 12) . This is chiefly because a large mismatch between the coefficients of thermal expansion of leucite (22−25×10 −6 /ºC) and glass matrix (8×10 -6 /ºC) correlates with the displacive phase transformation of leucite from cubic to tetragonal, leading to development of tangential compressive stresses around the leuciteglass interface during cooling [13][14][15] . These residual stresses then obstruct the crack driving force and act as crack deflectors, thus bestowing the fluorapatiteleucite ceramic with improved strength or increased hardness 16) .…”

Section: Introductionmentioning

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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“…Leucite is used in current conventional feldspathic porcelains for PFM restorations to provide the high expansion necessary for thermal compatibility with PFM alloys 2,3) . The improvement in mechanical properties of feldspathic porcelains with leucite has been attributed to a residual stress produced in the glass matrix due to a mismatch of coefficient of thermal expansion (CTE) between the dispersing leucite particles and the glass matrix [4][5][6][7] . Recently, the use of two feldspathic glasses with different CTEs has been reported to improve the mechanical properties of feldspathic porcelains 8) .…”

Section: Introductionmentioning

confidence: 99%

Effect of Polymorphism of SiO2 Addition on Mechanical Properties of Feldspathic Porcelains

et al. 2008

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The present study aimed to investigate the effects of SiO2 polymorphism on the mechanical properties of feldspathic porcelains. Seven kinds of experimental feldspathic porcelains were prepared using chemical reagents; three types of low-fusing feldspathic glasses and four types of two-phase porcelains by adding 10 or 20 mass% of fused silica (T-F) or cristobalite (T-C). Flexural strength and fracture toughness of these porcelains were evaluated. Flexural strengths of two-phase porcelains did not show any significant increase when compared with those of single-phase glasses. On the other hand, fracture toughnesses of porcelains with cristobalite showed a significant increase when compared with those of single-phase glasses. Circumferential cracks were observed in the porcelains with cristobalite. These results suggested that cristobalite could strengthen fracture toughness of feldspathic porcelains, but not flexural strength.

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Stress induced phase transformation of a cesium stabilized leucite porcelain and associated properties

Cited by 35 publications

References 12 publications

Quantitative XRD Analysis of Hydrothermally-derived Leucite Content in Dental Porcelain Ceramics

Quantitative XRD Analysis of Hydrothermally-derived Leucite Content in Dental Porcelain Ceramics

Degradability of fluorapatite-leucite ceramics in naturally acidic agents

Effect of Polymorphism of SiO2 Addition on Mechanical Properties of Feldspathic Porcelains

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