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J Dent Res 44(5): 1040-1044, 1965
© 1965 International and American Associations for Dental Research
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Pressure Changes in Polymerizing Polymethyl Methacrylate

H. F. ATKINSON 1 and A. A. GRANT 1

1 Department of Dental Prosthetics, School of Dental Science, University of Melbourne, Victoria, Australia

A technique has been developed to measure the pressure at the surface and center of a mass of polymerizing polymethyl methacrylate. The center of a polymerized specimen of polymethyl methacrylate has been shown to be at a lower pressure than the outer surface when processed in either gypsum molds or the air-pressure chamber. Lower central pressures do not appear to be directly associated with the production of porosity. The rate of heating has a direct relationship to the presence of porosity.

Submitted on October 5, 1964




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H. E. Dobbs and D. J. Abbott
Sensitive Method for Measuring the Relative Abrasiveness of Dentifrices
Journal of Dental Research, November 1, 1968; 47(6): 1072 - 1079.
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