. The Dental cosmos . s-nge in the mold at thetime the cast is made. Also, the patternmust be perfectly coated with the invest-ing material—and right here it is well toclarify an ambiguous statement whichappeared in my last paper on casting,entitled Standardizing the InvestingProcess and Simplifying the Casting Pro-cess, in Dental Cosmos, October L911,p. 1 10!). On page 1111, second column,this statemenl appears: Nodules or VAX HORN.—THE WAX PATTERN. 985 small eminences on the easting arecaused, not, as is generally believed, byair-bubbles that are supposed to be con-tained in the investment w
. The Dental cosmos . s-nge in the mold at thetime the cast is made. Also, the patternmust be perfectly coated with the invest-ing material—and right here it is well toclarify an ambiguous statement whichappeared in my last paper on casting,entitled Standardizing the InvestingProcess and Simplifying the Casting Pro-cess, in Dental Cosmos, October L911,p. 1 10!). On page 1111, second column,this statemenl appears: Nodules or VAX HORN.—THE WAX PATTERN. 985 small eminences on the easting arecaused, not, as is generally believed, byair-bubbles that are supposed to be con-tained in the investment which is pouredinto the flask, but rather by trapping airbetween the investment and the patternwhen the latter is being coated. At the ated very slowly and grudgingly whencoming in contact with water; hence wehave, with these graphite investing mate-rials, a condition which quite frequentlyis responsible for nodules which have beencaused, not by trapping air, but ratherby this so-called gas We have Fig. 1:.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectdentist, bookyear1912
