A Critical Analysis of the Importance of Compaction-Pressure on the Dimensional Distortion of ZrO2-Y2O3 Dental Prostheses

A.A.A.P. Silva; A.S. Rodrigues; R.X. Freitas; S.E.N. Cury; I.V.F. Suhett; C. Santos

doi:10.4028/www.scientific.net/MSF.727-728.1098

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HomeMaterials Science ForumMaterials Science Forum Vols. 727-728A Critical Analysis of the Importance of...

A Critical Analysis of the Importance of Compaction-Pressure on the Dimensional Distortion of ZrO₂-Y₂O₃ Dental Prostheses

Abstract:

In this work, the effect of pressure and direction of compression in the shrinkage and flatness of ZrO₂-(Y₂O₃) dental ceramics were studied. Samples (40x15x15mm) were uniaxial cold pressed at different pressures ranging from 10MPa to 160MPa, and then pre-sintered for further cutting. For comparison, samples were also isostatically cold pressed at 300MPa. The pre-sintered samples were cut longitudinally and transversely to the direction of compression, with final thickness of 1mm. Then the samples were ground and polished, and measured with a micrometer at different positions of the sample. After the measurements, the samples were sintered at 1530C-120 min, and again measures. The results indicate the effect of pressure decline in considerable amounts, up to pressures of about 80MPa. Above this value the differences in shrinkage and warpage are insignificant when compared to isostatically pressed samples.

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Periodical:

Materials Science Forum (Volumes 727-728)

Pages:

1098-1103

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.727-728.1098

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Online since:

August 2012

Authors:

A.A.A.P. Silva, A.S. Rodrigues, R.X. Freitas, S.E.N. Cury, I.V.F. Suhett, C. Santos

Keywords:

Characterization, Compaction, Shrinkage, ZrO₂ Dental Ceramics

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