Comparison of Two Tests for Determining the Castability of Dental Alloys
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH
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Castability is an important characteristic of dental alloys, since casting completeness and detail reproduction have a direct bearing on the quality of dental restorations. The polyester mesh pattern, or Whitlock test, has gained increased popularity as a castability monitor. Therefore, this study compared castability values Cv in the Whitlock test with Cv obtained from measuring the amount of bevel reproduced in a coping pattern using five casting alloys and two investments. The rank order and mean castability values for the five alloys in the Whitlock test with Ceramigold investment were Rexillium III 100, Naturelle 87.7, W-1 65.3, Olympia 48.9, and Forte 15.6. For the Whitlock test with Vestra-fine investiment, the results were Rexillium III and W-1 100, Naturelle 99.4, Olympia 85.8, and Forte 25.0. For the coping test with Ceramigold investment the rank order and castability values were Naturelle 96.9, Rexillium 96.4, Olympis 95.3, W-1 93.5, and Forte 63.2 with Ceramigold. For the coping test and Vestra-fine investment, the rank order and mean castability values were Naturelle 97.8, W-1 95.9, Forte 93.0, Rexillium 91.7, and Olympia 88.2.
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