A Comparison of Two Tests for Determining the Castability of Dental Alloys

Résumé du livre

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%). Theses, Gold alloys. (kt).