Notes on the treatment and filling of teeth / by Wm. Cass Grayston.

  • Grayston, William Cass.
Date:
1904
Catalogue details

Licence: In copyright

Credit: Notes on the treatment and filling of teeth / by Wm. Cass Grayston. Source: Wellcome Collection.

Provider: This material has been provided by The University of Glasgow Library. The original may be consulted at The University of Glasgow Library.

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    APPENDIX NOTE BY PROFESSOR SMITHELLS ON DETERMINING THE SPECIFIC GRAVITY OF GOLD fillings The Yorkshire College, Leeds. We have found it impossible to make any accurate and useful determinations of the dental specific gravity of your plugs by simply weighing in air and then in water. The plugs are more or less porous, and as the water gradually enters the pores the apparent weight alters. After a number of different trials, we settled on the following method, which has given satisfactory results :— The fillings were first made impenetrable to water by heating in vaseline to 100° C. for ten minutes. When the vaseline had cooled to the temperature of the room, the fillings were removed and thoroughly polished with fine linen. The volume of each im- penetrable filling was calculated from the difference
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