Properties of die materials: A comparative study

Dimensional Accuracy of 7 Die Materials

“…The poor strength and abrasion resistance of conventional Types IV and V dental stone become more significant in complex fixed prosthodontics, such as when transfer copings are necessary, or when fabricating all porcelain margins. Of the tested materials, Type IV resin‐impregnated and copper‐plated dies are recommended in those cases because of their strength, abrasion resistance, 8,21,22 and dimensional accuracy. If maximum strength and abrasion resistance are required, copper‐plated dies could be used.…”

“…ISO (International Standards Organization) Types IV (high‐strength, low‐expansion) and V (high‐strength, high‐expansion) improved stones are the most commonly used die materials, due to their perceived dimensional accuracy, low cost, and ease of use 2 . Improved dental stones have less than ideal abrasion resistance, 2–6 strength, and detail reproduction, 2 however. Those characteristics become more important as the complexity and the span of a fixed prosthesis increases, or when porcelain margins are fabricated.…”

Dimensional accuracy of epoxy resins and their compatibility with impression materials

“…He also used a separating medium to prevent the impression to adhere to the die material. Toreskog (1966) found the compatibility of filled epoxy resins and different impression materials tested was very poor. The use of polysulfide (Permlastic with Perma Rock) was the only combination with this die material, which yielded even a moderately satisfactory surface.…”

Comparison of Dimensional Accuracy of Four Different Die Materials before and after Disinfection of the Impression: An in vitro Study

“…Toreskog et al tested eight different classes of die materials and concluded that no material was superior. 9 Newman and Williams also concluded that an ideal universal die material is yet to be produced. 10 Gypsum die materials have been reported to exhibit a setting expansion of 0.01 to 0.1%.…”