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J Dent Res 37(2): 351-358, 1958
© 1958 International and American Associations for Dental Research
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DIMENSIONAL CHANGE IN WAX PATTERNS DURING SETTING OF GYPSUM INVESTMENTS

GEORGE MUMFORD 1 and RALPH W. PHILLIPS 1

1 Department of Dental Materials, Indiana University School of Dentistry, Indianapolis, Ind.

Technics have been described for studying wax pattern distortion during the setting of investments. All of the technics investigated produced distortion with the least occurring by use of an experimental investment having a setting expansion of 0.06 per cent. The degree of distortion is dependent upon the position of the pattern in the ring. The distortion begins within 1 minute after the initial set of the investment and reaches its maximum within 1 hour. The investment has unequal dimensional change throughout its mass during setting and this is an ever-present source of distortion.

Submitted on March 16, 1957
Revised on November 14, 1957






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