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J Dent Res 36(6): 945-949, 1957
© 1957 International and American Associations for Dental Research
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A METHOD OF MEASURING POROSITY OF PORCELAIN TEETH

JOHN O. SEMMELMAN 1

1 York, Pennsylvania

A method for measuring porosity of dental porcelain is described. It permits attainment of the following goals:

1. Porosity in a dental porcelain, which will be exposed by grinding, is measured directly and quantitatively. Air-fired porcelain is seen to have more than sixty times the porosity of vacuum-fired porcelain.

2. Texture effects are indicated directly and quantitatively in terms of bubble size. Air-fired porcelain is seen to have bubbles 6 times larger in area, and 2frac12 times greater in diameter than vacuum-fired porcelain.

3. The method is unaffected by shade or form, can be performed on commercial articles, and is rapid, accurate, and reproducible.

This basic method of measuring porosity has been modified by the National Bureau of Standards to specify porcelain tooth density in government contracts (VA-DM-1539a, 3/17/53).

Submitted on May 12, 1956
Revised on July 22, 1957






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