| 摘要 |
A device for shaping color test samples of porcelain formulations for use in making dental crowns, comprising a mandrel having a axial bore, a cylindrical rod insertable axially into the bore of the mandrel, and a releasable coupling element between the rod and the mandrel which permits rotation of the rod relative to the mandrel but resists axial movement between the two. At one end the mandrel has a cut-out section which exposes an end portion of the cylindrical rod in the axial bore. This section forms a radially curved molding surface on which a porcelain test sample can be formed having a curvature approximating that of a dental crown. The adherent sample is released from the rod at the molding surface by twisting the rod in the bore, without moving the rod axially. The color of a fired sample molded in this cut-out section has been found to better approximate the color of an actual crown of the same composition, then does the color of a flat sample formed with prior-art sample forming devices, from the same composition.
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