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Su-Kyoung Chang, Ik-Tae Chang, Soon-Ho Yim
장수경, 장익태, 임순호

The indirect technique for making cast restoration requires that dies be as accurate and durable
as possible. Currently, stone is the most commonly used material for die. However, it has some
problems such as the weakness in its strength and low abrasion resistance.
Recently, epoxy resin die systems have become available.
The purpose of this study was to examine two commercially available resin die systems and eval-
uate some characteristics for their clinical performance. This study evaluated the dimensional accu-
racy of epoxy resins and their wettability with impression materials.
In this study, the first experiment was about dimensional accuracy of different die materials. The
master model was made of stainless steel. 10 models were made of two epoxy resins (Die-epoxy,
Tri-epoxy) and a die stone (Fujirock) each. Occlusal diameter (Dimension I), occluso-gingival height
(Dimension II), and interabutment distance (Dimension III) were measured in each model.
Next, the contact angles of die materials with impression materials were observed. The blocks
were made of polyether, hydrophilic additional silicone, polysulfide impression materials. By drop-
ping the same amount (0.05㎖) of Tri-epoxy, Die-epoxy, and die stone on the blocks, 10 samples
of each die material were made. After setting of materials, the contact angles were measured.
The results of this study were as follows.
1. The  expansion  of  stone  die  and  the  shrinkage  of  resin  dies  in  occlusal  diameter were
observed, and stone and Tri-epoxy were expanded and Die-epoxy was shrinked in occluso-gin-
gival height. There was little change among materials in interabutment distance (p>0.05).
2. In comparison with the master model, Tri-epoxy had the least variation in measurement of the
three die systems examined. Die-epoxy was next, and die stone showed the greatest variation.
3. The  compatibility  of  die  stone  for  polyether,  hydrophilic  additional  silicone,  polysulfide
decreased in order, wherease epoxy materials had the decreased compatibility for polyether and
polysulfide, hydrophilic additional silicone in order. It was not statistically different between
polyether and polysulfide (p>0.05).
4. The contact angles of Tri-epoxy, Die-epoxy, die stone were getting bigger in order.

* Keywords: Epoxy resin, Die material, Dimensional accuracy, Contact angle, Compatibility

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