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Dental cast and die materials are essential material using in almost dental prsthodontic procedure and it’s most important requirement is accuracy for reporducing the oral anatomical structures. In this study, 5 abutments A, B, C, D, E were fabricated on the metal master model to simulate the arch form and specimens were poured with 4 cast materials. Inter-abutment distances, A-B, A-C, A-D, A-E, B-C, B-D were calculated using the photo-scanning and the deviations from the metal master model were also evaluated. @ES The results were as follows ; @EN 1. The distance between A-B, A-C, A-D, A-E, B-C, B-D of the abutments A, B, C, D, E of each cast material was calculated. And after comparing the deviations between the metal master model. Fujirock(r) showed the lowest value with 0.20±0.22mm, and the deviation increased in the order of Suprastone(r), Epoxy Dies(r), Die Keen(r). There was significant difference between Fujirock(r)and Epoxy Die(r), Die Keen(r). 2. In each calculation area, the difference in measurements between cast material and metal master model showed significant difference between A-B and Cross arch measurements of A-D, B-D, A-E(p<0.05). 3. The difference in measurements between cast material and metal master model in the A-B area showed Fujirock(r) to be the lowest with 0.05±0.04mm and increased in the order of Die Keen(r), Suprastone(r), Epoxy Dies(r). There was significant difference between Fujirock(r) and Suprastone(r), Epoxy Die(r)(p<0.05). 4. The difference in measurements between cast master and metal master model in the B-C area showed Fujirock(r) to be the lowest with 0.17±0.11mm, and increased in the order of Suprastone(r), Die Keen(r), Epoxy Die(r). There was significant difference between Fujirock(r) and Die Keen(r), Epoxy Die(r)(p<0.05). 5. The difference in measurements between cast master and metal master model in the B-D area showed Fujirock(r) to be the lowest with 0.13±0.07mm, Epoxy Die(r) and increased in the order of Suprastone(r), Die Keen(r). There was significant difference between Fujirock(r) and Die Keen(p<0.05). 6. In this experiment, Epoxy Die(r) showed mean contraction in every calculation area. And when reconstructing cross arch restorations it is thought that distortion should be considered in every cast material.
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