Abstract
A positive ear mold is processed to the desired size, equipped with a core in the proximal region, dipped in wax and placed in a container in which casting material for a negative form is filled. After the ear mold has been taken out and the core has been removed, a flexible sliver is drawn into the negative form. The sliver is laid out along the inner wall of the negative form prior to casting, and subsequently, the material for the housing shell is filled into the negative form. After a brief polymerization time, the excess material is emptied out and after it has hardened, the housing shell is removed from the negative form. By pulling a sliver insert out of the channel molded in the housing shell, one obtains a housing shell having a vent molded therein.
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