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Journal of Dental Research
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The Three-point Beam Test for the Evaluation of Dental Porcelain

M.R. Edwards

Department of Conservative Dentistry, Welsh National School of Medicine, Heath Park, Cardiff, CF4 4XY, United Kingdom

P.H. Jacobsen

Department of Conservative Dentistry, Welsh National School of Medicine, Heath Park, Cardiff, CF4 4XY, United Kingdom

G.J. Williams

Department of Conservative Dentistry, Welsh National School of Medicine, Heath Park, Cardiff, CF4 4XY, United Kingdom

The three-point beam test is simple and extremely sensitive to surface conditions. It appears to be ideally suited to the evaluation of dental porcelain, but specimen fabrication is difficult. In this study, specimens of porcelain fired on platinum foil have been constructed using an alumina former. The results showed excellent specimen consistency and reproducibility. Of the surfaces investigated, the use of tin-oxide-coated platinum foil did not result in an increase in transverse strength.

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Journal of Dental Research, Vol. 62, No. 10, 1086-1088 (1983)
DOI: 10.1177/00220345830620101701
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M.R. Edwards and P.H. Jacobsen
The 'C'-Test for the Evaluation of Dental Porcelain
Journal of Dental Research, September 1, 1985; 64(9): 1176 - 1178.
[Abstract] [PDF]

This Article
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